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Message-ID: <20151103110855.GA2081@gmail.com>
Date: Tue, 3 Nov 2015 12:08:55 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Denys Vlasenko <dvlasenk@...hat.com>
Subject: [GIT PULL] x86/fpu changes for v4.4
Linus,
Please pull the latest x86-fpu-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-fpu-for-linus
# HEAD: 158ecc39185b885420e5136b803b29be2bbec7fb x86/fpu: Fixup uninitialized feature_name warning
There are two main areas of changes:
- Rework of the extended FPU state code to robustify the kernel's usage of cpuid
provided xstate sizes - and related changes. (Dave Hansen)
- math emulation enhancements: new modern FPU instructions support, with
testcases, plus cleanups. (Denys Vlasnko)
Thanks,
Ingo
------------------>
Borislav Petkov (1):
x86/fpu: Fixup uninitialized feature_name warning
Dave Hansen (15):
x86/fpu: Print xfeature buffer size in decimal
x86/fpu: Move XSAVE-disabling code to a helper
x86/fpu: Remove XSTATE_RESERVE
x86/fpu: Remove partial LWP support definitions
x86/fpu: Rename XSAVE macros
x86/fpu: Rename XFEATURES_NR_MAX
x86/fpu: Rework XSTATE_* macros to remove magic '2'
x86/fpu: Remove 'xfeature_nr'
x86/fpu: Add xfeature_enabled() helper instead of test_bit()
x86/fpu/mpx: Rework MPX 'xstate' types
x86/fpu: Rework YMM definition
x86/fpu: Add C structures for AVX-512 state components
x86/fpu: Correct and check XSAVE xstate size calculations
x86/fpu: Check to ensure increasing-offset xstate offsets
x86/fpu: Check CPU-provided sizes against struct declarations
Denys Vlasenko (7):
x86/fpu/math-emu: Remove !NO_UNDOC_CODE
x86/fpu/math-emu, selftests: Add tests for FCMOV and FCOMI insns
x86/fpu/math-emu: Remove define layer for undocumented opcodes
x86/fpu/math-emu: Add support for F[U]COMI[P] insns
x86/fpu/math-emu: Add support for FCMOVcc insns
x86/fpu/math-emu, selftests: Add test for FISTTP instructions
x86/fpu/math-emu: Add support for FISTTP instructions
arch/x86/crypto/camellia_aesni_avx2_glue.c | 3 +-
arch/x86/crypto/camellia_aesni_avx_glue.c | 3 +-
arch/x86/crypto/cast5_avx_glue.c | 3 +-
arch/x86/crypto/cast6_avx_glue.c | 3 +-
arch/x86/crypto/chacha20_glue.c | 2 +-
arch/x86/crypto/poly1305_glue.c | 2 +-
arch/x86/crypto/serpent_avx2_glue.c | 3 +-
arch/x86/crypto/serpent_avx_glue.c | 3 +-
arch/x86/crypto/sha1_ssse3_glue.c | 2 +-
arch/x86/crypto/sha256_ssse3_glue.c | 2 +-
arch/x86/crypto/sha512_ssse3_glue.c | 2 +-
arch/x86/crypto/twofish_avx_glue.c | 2 +-
arch/x86/include/asm/fpu/types.h | 148 +++++++----
arch/x86/include/asm/fpu/xstate.h | 15 +-
arch/x86/include/asm/trace/mpx.h | 7 +-
arch/x86/kernel/fpu/init.c | 18 +-
arch/x86/kernel/fpu/regset.c | 4 +-
arch/x86/kernel/fpu/signal.c | 6 +-
arch/x86/kernel/fpu/xstate.c | 398 +++++++++++++++++++++++++----
arch/x86/kernel/traps.c | 4 +-
arch/x86/kvm/cpuid.c | 4 +-
arch/x86/kvm/x86.c | 27 +-
arch/x86/kvm/x86.h | 6 +-
arch/x86/math-emu/fpu_aux.c | 70 +++++
arch/x86/math-emu/fpu_entry.c | 96 +++----
arch/x86/math-emu/fpu_proto.h | 12 +
arch/x86/math-emu/load_store.c | 63 ++++-
arch/x86/math-emu/reg_compare.c | 128 ++++++++++
arch/x86/mm/mpx.c | 15 +-
tools/testing/selftests/x86/Makefile | 5 +-
tools/testing/selftests/x86/test_FCMOV.c | 93 +++++++
tools/testing/selftests/x86/test_FCOMI.c | 331 ++++++++++++++++++++++++
tools/testing/selftests/x86/test_FISTTP.c | 137 ++++++++++
33 files changed, 1374 insertions(+), 243 deletions(-)
create mode 100644 tools/testing/selftests/x86/test_FCMOV.c
create mode 100644 tools/testing/selftests/x86/test_FCOMI.c
create mode 100644 tools/testing/selftests/x86/test_FISTTP.c
diff --git a/arch/x86/crypto/camellia_aesni_avx2_glue.c b/arch/x86/crypto/camellia_aesni_avx2_glue.c
index 4c65c70e628b..d84456924563 100644
--- a/arch/x86/crypto/camellia_aesni_avx2_glue.c
+++ b/arch/x86/crypto/camellia_aesni_avx2_glue.c
@@ -567,7 +567,8 @@ static int __init camellia_aesni_init(void)
return -ENODEV;
}
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/camellia_aesni_avx_glue.c b/arch/x86/crypto/camellia_aesni_avx_glue.c
index 80a0e4389c9a..12e729bfe71b 100644
--- a/arch/x86/crypto/camellia_aesni_avx_glue.c
+++ b/arch/x86/crypto/camellia_aesni_avx_glue.c
@@ -554,7 +554,8 @@ static int __init camellia_aesni_init(void)
{
const char *feature_name;
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/cast5_avx_glue.c b/arch/x86/crypto/cast5_avx_glue.c
index be00aa48b2b5..8648158f3916 100644
--- a/arch/x86/crypto/cast5_avx_glue.c
+++ b/arch/x86/crypto/cast5_avx_glue.c
@@ -469,7 +469,8 @@ static int __init cast5_init(void)
{
const char *feature_name;
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/cast6_avx_glue.c b/arch/x86/crypto/cast6_avx_glue.c
index 5dbba7224221..fca459578c35 100644
--- a/arch/x86/crypto/cast6_avx_glue.c
+++ b/arch/x86/crypto/cast6_avx_glue.c
@@ -591,7 +591,8 @@ static int __init cast6_init(void)
{
const char *feature_name;
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/chacha20_glue.c b/arch/x86/crypto/chacha20_glue.c
index effe2160b7c5..722bacea040e 100644
--- a/arch/x86/crypto/chacha20_glue.c
+++ b/arch/x86/crypto/chacha20_glue.c
@@ -130,7 +130,7 @@ static int __init chacha20_simd_mod_init(void)
#ifdef CONFIG_AS_AVX2
chacha20_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
- cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL);
+ cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
#endif
return crypto_register_alg(&alg);
}
diff --git a/arch/x86/crypto/poly1305_glue.c b/arch/x86/crypto/poly1305_glue.c
index f7170d764f32..4264a3d59589 100644
--- a/arch/x86/crypto/poly1305_glue.c
+++ b/arch/x86/crypto/poly1305_glue.c
@@ -184,7 +184,7 @@ static int __init poly1305_simd_mod_init(void)
#ifdef CONFIG_AS_AVX2
poly1305_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
- cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL);
+ cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
if (poly1305_use_avx2)
alg.descsize += 10 * sizeof(u32);
diff --git a/arch/x86/crypto/serpent_avx2_glue.c b/arch/x86/crypto/serpent_avx2_glue.c
index 7d838dc4d888..6d198342e2de 100644
--- a/arch/x86/crypto/serpent_avx2_glue.c
+++ b/arch/x86/crypto/serpent_avx2_glue.c
@@ -542,7 +542,8 @@ static int __init init(void)
pr_info("AVX2 instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/serpent_avx_glue.c b/arch/x86/crypto/serpent_avx_glue.c
index da7dafc9b16d..5dc37026c7ce 100644
--- a/arch/x86/crypto/serpent_avx_glue.c
+++ b/arch/x86/crypto/serpent_avx_glue.c
@@ -597,7 +597,8 @@ static int __init serpent_init(void)
{
const char *feature_name;
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 7c48e8b20848..00212c32d4db 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -121,7 +121,7 @@ static struct shash_alg alg = {
#ifdef CONFIG_AS_AVX
static bool __init avx_usable(void)
{
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
pr_info("AVX detected but unusable.\n");
return false;
diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c
index f8097fc0d1d1..0e0e85aea634 100644
--- a/arch/x86/crypto/sha256_ssse3_glue.c
+++ b/arch/x86/crypto/sha256_ssse3_glue.c
@@ -130,7 +130,7 @@ static struct shash_alg algs[] = { {
#ifdef CONFIG_AS_AVX
static bool __init avx_usable(void)
{
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
pr_info("AVX detected but unusable.\n");
return false;
diff --git a/arch/x86/crypto/sha512_ssse3_glue.c b/arch/x86/crypto/sha512_ssse3_glue.c
index 2edad7b81870..0c8c38c101ac 100644
--- a/arch/x86/crypto/sha512_ssse3_glue.c
+++ b/arch/x86/crypto/sha512_ssse3_glue.c
@@ -129,7 +129,7 @@ static struct shash_alg algs[] = { {
#ifdef CONFIG_AS_AVX
static bool __init avx_usable(void)
{
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
pr_info("AVX detected but unusable.\n");
return false;
diff --git a/arch/x86/crypto/twofish_avx_glue.c b/arch/x86/crypto/twofish_avx_glue.c
index c2bd0ce718ee..b7a3904b953c 100644
--- a/arch/x86/crypto/twofish_avx_glue.c
+++ b/arch/x86/crypto/twofish_avx_glue.c
@@ -558,7 +558,7 @@ static int __init twofish_init(void)
{
const char *feature_name;
- if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, &feature_name)) {
+ if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index c49c5173158e..1c6f6ac52ad0 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -95,63 +95,122 @@ struct swregs_state {
/*
* List of XSAVE features Linux knows about:
*/
-enum xfeature_bit {
- XSTATE_BIT_FP,
- XSTATE_BIT_SSE,
- XSTATE_BIT_YMM,
- XSTATE_BIT_BNDREGS,
- XSTATE_BIT_BNDCSR,
- XSTATE_BIT_OPMASK,
- XSTATE_BIT_ZMM_Hi256,
- XSTATE_BIT_Hi16_ZMM,
-
- XFEATURES_NR_MAX,
+enum xfeature {
+ XFEATURE_FP,
+ XFEATURE_SSE,
+ /*
+ * Values above here are "legacy states".
+ * Those below are "extended states".
+ */
+ XFEATURE_YMM,
+ XFEATURE_BNDREGS,
+ XFEATURE_BNDCSR,
+ XFEATURE_OPMASK,
+ XFEATURE_ZMM_Hi256,
+ XFEATURE_Hi16_ZMM,
+
+ XFEATURE_MAX,
};
-#define XSTATE_FP (1 << XSTATE_BIT_FP)
-#define XSTATE_SSE (1 << XSTATE_BIT_SSE)
-#define XSTATE_YMM (1 << XSTATE_BIT_YMM)
-#define XSTATE_BNDREGS (1 << XSTATE_BIT_BNDREGS)
-#define XSTATE_BNDCSR (1 << XSTATE_BIT_BNDCSR)
-#define XSTATE_OPMASK (1 << XSTATE_BIT_OPMASK)
-#define XSTATE_ZMM_Hi256 (1 << XSTATE_BIT_ZMM_Hi256)
-#define XSTATE_Hi16_ZMM (1 << XSTATE_BIT_Hi16_ZMM)
+#define XFEATURE_MASK_FP (1 << XFEATURE_FP)
+#define XFEATURE_MASK_SSE (1 << XFEATURE_SSE)
+#define XFEATURE_MASK_YMM (1 << XFEATURE_YMM)
+#define XFEATURE_MASK_BNDREGS (1 << XFEATURE_BNDREGS)
+#define XFEATURE_MASK_BNDCSR (1 << XFEATURE_BNDCSR)
+#define XFEATURE_MASK_OPMASK (1 << XFEATURE_OPMASK)
+#define XFEATURE_MASK_ZMM_Hi256 (1 << XFEATURE_ZMM_Hi256)
+#define XFEATURE_MASK_Hi16_ZMM (1 << XFEATURE_Hi16_ZMM)
+
+#define XFEATURE_MASK_FPSSE (XFEATURE_MASK_FP | XFEATURE_MASK_SSE)
+#define XFEATURE_MASK_AVX512 (XFEATURE_MASK_OPMASK \
+ | XFEATURE_MASK_ZMM_Hi256 \
+ | XFEATURE_MASK_Hi16_ZMM)
+
+#define FIRST_EXTENDED_XFEATURE XFEATURE_YMM
-#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
-#define XSTATE_AVX512 (XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
+struct reg_128_bit {
+ u8 regbytes[128/8];
+};
+struct reg_256_bit {
+ u8 regbytes[256/8];
+};
+struct reg_512_bit {
+ u8 regbytes[512/8];
+};
/*
+ * State component 2:
+ *
* There are 16x 256-bit AVX registers named YMM0-YMM15.
* The low 128 bits are aliased to the 16 SSE registers (XMM0-XMM15)
- * and are stored in 'struct fxregs_state::xmm_space[]'.
+ * and are stored in 'struct fxregs_state::xmm_space[]' in the
+ * "legacy" area.
*
- * The high 128 bits are stored here:
- * 16x 128 bits == 256 bytes.
+ * The high 128 bits are stored here.
*/
struct ymmh_struct {
- u8 ymmh_space[256];
-};
-
-/* We don't support LWP yet: */
-struct lwp_struct {
- u8 reserved[128];
-};
+ struct reg_128_bit hi_ymm[16];
+} __packed;
/* Intel MPX support: */
-struct bndreg {
+
+struct mpx_bndreg {
u64 lower_bound;
u64 upper_bound;
} __packed;
+/*
+ * State component 3 is used for the 4 128-bit bounds registers
+ */
+struct mpx_bndreg_state {
+ struct mpx_bndreg bndreg[4];
+} __packed;
-struct bndcsr {
+/*
+ * State component 4 is used for the 64-bit user-mode MPX
+ * configuration register BNDCFGU and the 64-bit MPX status
+ * register BNDSTATUS. We call the pair "BNDCSR".
+ */
+struct mpx_bndcsr {
u64 bndcfgu;
u64 bndstatus;
} __packed;
-struct mpx_struct {
- struct bndreg bndreg[4];
- struct bndcsr bndcsr;
-};
+/*
+ * The BNDCSR state is padded out to be 64-bytes in size.
+ */
+struct mpx_bndcsr_state {
+ union {
+ struct mpx_bndcsr bndcsr;
+ u8 pad_to_64_bytes[64];
+ };
+} __packed;
+
+/* AVX-512 Components: */
+
+/*
+ * State component 5 is used for the 8 64-bit opmask registers
+ * k0-k7 (opmask state).
+ */
+struct avx_512_opmask_state {
+ u64 opmask_reg[8];
+} __packed;
+
+/*
+ * State component 6 is used for the upper 256 bits of the
+ * registers ZMM0-ZMM15. These 16 256-bit values are denoted
+ * ZMM0_H-ZMM15_H (ZMM_Hi256 state).
+ */
+struct avx_512_zmm_uppers_state {
+ struct reg_256_bit zmm_upper[16];
+} __packed;
+
+/*
+ * State component 7 is used for the 16 512-bit registers
+ * ZMM16-ZMM31 (Hi16_ZMM state).
+ */
+struct avx_512_hi16_state {
+ struct reg_512_bit hi16_zmm[16];
+} __packed;
struct xstate_header {
u64 xfeatures;
@@ -159,22 +218,19 @@ struct xstate_header {
u64 reserved[6];
} __attribute__((packed));
-/* New processor state extensions should be added here: */
-#define XSTATE_RESERVE (sizeof(struct ymmh_struct) + \
- sizeof(struct lwp_struct) + \
- sizeof(struct mpx_struct) )
/*
* This is our most modern FPU state format, as saved by the XSAVE
* and restored by the XRSTOR instructions.
*
* It consists of a legacy fxregs portion, an xstate header and
- * subsequent fixed size areas as defined by the xstate header.
- * Not all CPUs support all the extensions.
+ * subsequent areas as defined by the xstate header. Not all CPUs
+ * support all the extensions, so the size of the extended area
+ * can vary quite a bit between CPUs.
*/
struct xregs_state {
struct fxregs_state i387;
struct xstate_header header;
- u8 __reserved[XSTATE_RESERVE];
+ u8 extended_state_area[0];
} __attribute__ ((packed, aligned (64)));
/*
@@ -182,7 +238,9 @@ struct xregs_state {
* put together, so that we can pick the right one runtime.
*
* The size of the structure is determined by the largest
- * member - which is the xsave area:
+ * member - which is the xsave area. The padding is there
+ * to ensure that statically-allocated task_structs (just
+ * the init_task today) have enough space.
*/
union fpregs_state {
struct fregs_state fsave;
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 4656b25bb9a7..3a6c89b70307 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -6,7 +6,7 @@
#include <linux/uaccess.h>
/* Bit 63 of XCR0 is reserved for future expansion */
-#define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
+#define XFEATURE_MASK_EXTEND (~(XFEATURE_MASK_FPSSE | (1ULL << 63)))
#define XSTATE_CPUID 0x0000000d
@@ -19,14 +19,18 @@
#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
/* Supported features which support lazy state saving */
-#define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
- | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
+#define XFEATURE_MASK_LAZY (XFEATURE_MASK_FP | \
+ XFEATURE_MASK_SSE | \
+ XFEATURE_MASK_YMM | \
+ XFEATURE_MASK_OPMASK | \
+ XFEATURE_MASK_ZMM_Hi256 | \
+ XFEATURE_MASK_Hi16_ZMM)
/* Supported features which require eager state saving */
-#define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
+#define XFEATURE_MASK_EAGER (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR)
/* All currently supported features */
-#define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
+#define XCNTXT_MASK (XFEATURE_MASK_LAZY | XFEATURE_MASK_EAGER)
#ifdef CONFIG_X86_64
#define REX_PREFIX "0x48, "
@@ -40,6 +44,7 @@ extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
+void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
diff --git a/arch/x86/include/asm/trace/mpx.h b/arch/x86/include/asm/trace/mpx.h
index 173dd3ba108c..0f492fc50bce 100644
--- a/arch/x86/include/asm/trace/mpx.h
+++ b/arch/x86/include/asm/trace/mpx.h
@@ -11,7 +11,7 @@
TRACE_EVENT(mpx_bounds_register_exception,
TP_PROTO(void *addr_referenced,
- const struct bndreg *bndreg),
+ const struct mpx_bndreg *bndreg),
TP_ARGS(addr_referenced, bndreg),
TP_STRUCT__entry(
@@ -44,7 +44,7 @@ TRACE_EVENT(mpx_bounds_register_exception,
TRACE_EVENT(bounds_exception_mpx,
- TP_PROTO(const struct bndcsr *bndcsr),
+ TP_PROTO(const struct mpx_bndcsr *bndcsr),
TP_ARGS(bndcsr),
TP_STRUCT__entry(
@@ -116,7 +116,8 @@ TRACE_EVENT(mpx_new_bounds_table,
/*
* This gets used outside of MPX-specific code, so we need a stub.
*/
-static inline void trace_bounds_exception_mpx(const struct bndcsr *bndcsr)
+static inline
+void trace_bounds_exception_mpx(const struct mpx_bndcsr *bndcsr)
{
}
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index d14e9ac3235a..be39b5fde4b9 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -290,11 +290,11 @@ static void __init fpu__init_system_ctx_switch(void)
if (cpu_has_xsaveopt && eagerfpu != DISABLE)
eagerfpu = ENABLE;
- if (xfeatures_mask & XSTATE_EAGER) {
+ if (xfeatures_mask & XFEATURE_MASK_EAGER) {
if (eagerfpu == DISABLE) {
pr_err("x86/fpu: eagerfpu switching disabled, disabling the following xstate features: 0x%llx.\n",
- xfeatures_mask & XSTATE_EAGER);
- xfeatures_mask &= ~XSTATE_EAGER;
+ xfeatures_mask & XFEATURE_MASK_EAGER);
+ xfeatures_mask &= ~XFEATURE_MASK_EAGER;
} else {
eagerfpu = ENABLE;
}
@@ -354,17 +354,7 @@ static int __init x86_noxsave_setup(char *s)
if (strlen(s))
return 0;
- setup_clear_cpu_cap(X86_FEATURE_XSAVE);
- setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
- setup_clear_cpu_cap(X86_FEATURE_XSAVEC);
- setup_clear_cpu_cap(X86_FEATURE_XSAVES);
- setup_clear_cpu_cap(X86_FEATURE_AVX);
- setup_clear_cpu_cap(X86_FEATURE_AVX2);
- setup_clear_cpu_cap(X86_FEATURE_AVX512F);
- setup_clear_cpu_cap(X86_FEATURE_AVX512PF);
- setup_clear_cpu_cap(X86_FEATURE_AVX512ER);
- setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
- setup_clear_cpu_cap(X86_FEATURE_MPX);
+ fpu__xstate_clear_all_cpu_caps();
return 1;
}
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index dc60810c1c74..0bc3490420c5 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -66,7 +66,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
* presence of FP and SSE state.
*/
if (cpu_has_xsave)
- fpu->state.xsave.header.xfeatures |= XSTATE_FPSSE;
+ fpu->state.xsave.header.xfeatures |= XFEATURE_MASK_FPSSE;
return ret;
}
@@ -326,7 +326,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
* presence of FP.
*/
if (cpu_has_xsave)
- fpu->state.xsave.header.xfeatures |= XSTATE_FP;
+ fpu->state.xsave.header.xfeatures |= XFEATURE_MASK_FP;
return ret;
}
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 50ec9af1bd51..eb032677f939 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -107,7 +107,7 @@ static inline int save_xstate_epilog(void __user *buf, int ia32_frame)
* header as well as change any contents in the memory layout.
* xrestore as part of sigreturn will capture all the changes.
*/
- xfeatures |= XSTATE_FPSSE;
+ xfeatures |= XFEATURE_MASK_FPSSE;
err |= __put_user(xfeatures, (__u32 *)&x->header.xfeatures);
@@ -207,7 +207,7 @@ sanitize_restored_xstate(struct task_struct *tsk,
* layout and not enabled by the OS.
*/
if (fx_only)
- header->xfeatures = XSTATE_FPSSE;
+ header->xfeatures = XFEATURE_MASK_FPSSE;
else
header->xfeatures &= (xfeatures_mask & xfeatures);
}
@@ -230,7 +230,7 @@ static inline int copy_user_to_fpregs_zeroing(void __user *buf, u64 xbv, int fx_
{
if (use_xsave()) {
if ((unsigned long)buf % 64 || fx_only) {
- u64 init_bv = xfeatures_mask & ~XSTATE_FPSSE;
+ u64 init_bv = xfeatures_mask & ~XFEATURE_MASK_FPSSE;
copy_kernel_to_xregs(&init_fpstate.xsave, init_bv);
return copy_user_to_fxregs(buf);
} else {
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 62fc001c7846..6454f2731b56 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -31,12 +31,28 @@ static const char *xfeature_names[] =
*/
u64 xfeatures_mask __read_mostly;
-static unsigned int xstate_offsets[XFEATURES_NR_MAX] = { [ 0 ... XFEATURES_NR_MAX - 1] = -1};
-static unsigned int xstate_sizes[XFEATURES_NR_MAX] = { [ 0 ... XFEATURES_NR_MAX - 1] = -1};
+static unsigned int xstate_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
+static unsigned int xstate_sizes[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_comp_offsets[sizeof(xfeatures_mask)*8];
-/* The number of supported xfeatures in xfeatures_mask: */
-static unsigned int xfeatures_nr;
+/*
+ * Clear all of the X86_FEATURE_* bits that are unavailable
+ * when the CPU has no XSAVE support.
+ */
+void fpu__xstate_clear_all_cpu_caps(void)
+{
+ setup_clear_cpu_cap(X86_FEATURE_XSAVE);
+ setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
+ setup_clear_cpu_cap(X86_FEATURE_XSAVEC);
+ setup_clear_cpu_cap(X86_FEATURE_XSAVES);
+ setup_clear_cpu_cap(X86_FEATURE_AVX);
+ setup_clear_cpu_cap(X86_FEATURE_AVX2);
+ setup_clear_cpu_cap(X86_FEATURE_AVX512F);
+ setup_clear_cpu_cap(X86_FEATURE_AVX512PF);
+ setup_clear_cpu_cap(X86_FEATURE_AVX512ER);
+ setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
+ setup_clear_cpu_cap(X86_FEATURE_MPX);
+}
/*
* Return whether the system supports a given xfeature.
@@ -53,7 +69,7 @@ int cpu_has_xfeatures(u64 xfeatures_needed, const char **feature_name)
/*
* So we use FLS here to be able to print the most advanced
* feature that was requested but is missing. So if a driver
- * asks about "XSTATE_SSE | XSTATE_YMM" we'll print the
+ * asks about "XFEATURE_MASK_SSE | XFEATURE_MASK_YMM" we'll print the
* missing AVX feature - this is the most informative message
* to users:
*/
@@ -112,7 +128,7 @@ void fpstate_sanitize_xstate(struct fpu *fpu)
/*
* FP is in init state
*/
- if (!(xfeatures & XSTATE_FP)) {
+ if (!(xfeatures & XFEATURE_MASK_FP)) {
fx->cwd = 0x37f;
fx->swd = 0;
fx->twd = 0;
@@ -125,7 +141,7 @@ void fpstate_sanitize_xstate(struct fpu *fpu)
/*
* SSE is in init state
*/
- if (!(xfeatures & XSTATE_SSE))
+ if (!(xfeatures & XFEATURE_MASK_SSE))
memset(&fx->xmm_space[0], 0, 256);
/*
@@ -169,25 +185,43 @@ void fpu__init_cpu_xstate(void)
}
/*
+ * Note that in the future we will likely need a pair of
+ * functions here: one for user xstates and the other for
+ * system xstates. For now, they are the same.
+ */
+static int xfeature_enabled(enum xfeature xfeature)
+{
+ return !!(xfeatures_mask & (1UL << xfeature));
+}
+
+/*
* Record the offsets and sizes of various xstates contained
* in the XSAVE state memory layout.
- *
- * ( Note that certain features might be non-present, for them
- * we'll have 0 offset and 0 size. )
*/
static void __init setup_xstate_features(void)
{
- u32 eax, ebx, ecx, edx, leaf;
-
- xfeatures_nr = fls64(xfeatures_mask);
-
- for (leaf = 2; leaf < xfeatures_nr; leaf++) {
- cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
-
- xstate_offsets[leaf] = ebx;
- xstate_sizes[leaf] = eax;
+ u32 eax, ebx, ecx, edx, i;
+ /* start at the beginnning of the "extended state" */
+ unsigned int last_good_offset = offsetof(struct xregs_state,
+ extended_state_area);
+
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
+ if (!xfeature_enabled(i))
+ continue;
+
+ cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
+ xstate_offsets[i] = ebx;
+ xstate_sizes[i] = eax;
+ /*
+ * In our xstate size checks, we assume that the
+ * highest-numbered xstate feature has the
+ * highest offset in the buffer. Ensure it does.
+ */
+ WARN_ONCE(last_good_offset > xstate_offsets[i],
+ "x86/fpu: misordered xstate at %d\n", last_good_offset);
+ last_good_offset = xstate_offsets[i];
- printk(KERN_INFO "x86/fpu: xstate_offset[%d]: %04x, xstate_sizes[%d]: %04x\n", leaf, ebx, leaf, eax);
+ printk(KERN_INFO "x86/fpu: xstate_offset[%d]: %4d, xstate_sizes[%d]: %4d\n", i, ebx, i, eax);
}
}
@@ -204,14 +238,14 @@ static void __init print_xstate_feature(u64 xstate_mask)
*/
static void __init print_xstate_features(void)
{
- print_xstate_feature(XSTATE_FP);
- print_xstate_feature(XSTATE_SSE);
- print_xstate_feature(XSTATE_YMM);
- print_xstate_feature(XSTATE_BNDREGS);
- print_xstate_feature(XSTATE_BNDCSR);
- print_xstate_feature(XSTATE_OPMASK);
- print_xstate_feature(XSTATE_ZMM_Hi256);
- print_xstate_feature(XSTATE_Hi16_ZMM);
+ print_xstate_feature(XFEATURE_MASK_FP);
+ print_xstate_feature(XFEATURE_MASK_SSE);
+ print_xstate_feature(XFEATURE_MASK_YMM);
+ print_xstate_feature(XFEATURE_MASK_BNDREGS);
+ print_xstate_feature(XFEATURE_MASK_BNDCSR);
+ print_xstate_feature(XFEATURE_MASK_OPMASK);
+ print_xstate_feature(XFEATURE_MASK_ZMM_Hi256);
+ print_xstate_feature(XFEATURE_MASK_Hi16_ZMM);
}
/*
@@ -233,8 +267,8 @@ static void __init setup_xstate_comp(void)
xstate_comp_offsets[1] = offsetof(struct fxregs_state, xmm_space);
if (!cpu_has_xsaves) {
- for (i = 2; i < xfeatures_nr; i++) {
- if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
+ if (xfeature_enabled(i)) {
xstate_comp_offsets[i] = xstate_offsets[i];
xstate_comp_sizes[i] = xstate_sizes[i];
}
@@ -242,15 +276,16 @@ static void __init setup_xstate_comp(void)
return;
}
- xstate_comp_offsets[2] = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+ xstate_comp_offsets[FIRST_EXTENDED_XFEATURE] =
+ FXSAVE_SIZE + XSAVE_HDR_SIZE;
- for (i = 2; i < xfeatures_nr; i++) {
- if (test_bit(i, (unsigned long *)&xfeatures_mask))
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
+ if (xfeature_enabled(i))
xstate_comp_sizes[i] = xstate_sizes[i];
else
xstate_comp_sizes[i] = 0;
- if (i > 2)
+ if (i > FIRST_EXTENDED_XFEATURE)
xstate_comp_offsets[i] = xstate_comp_offsets[i-1]
+ xstate_comp_sizes[i-1];
@@ -290,27 +325,280 @@ static void __init setup_init_fpu_buf(void)
copy_xregs_to_kernel_booting(&init_fpstate.xsave);
}
+static int xfeature_is_supervisor(int xfeature_nr)
+{
+ /*
+ * We currently do not support supervisor states, but if
+ * we did, we could find out like this.
+ *
+ * SDM says: If state component i is a user state component,
+ * ECX[0] return 0; if state component i is a supervisor
+ * state component, ECX[0] returns 1.
+ u32 eax, ebx, ecx, edx;
+ cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx;
+ return !!(ecx & 1);
+ */
+ return 0;
+}
+/*
+static int xfeature_is_user(int xfeature_nr)
+{
+ return !xfeature_is_supervisor(xfeature_nr);
+}
+*/
+
+/*
+ * This check is important because it is easy to get XSTATE_*
+ * confused with XSTATE_BIT_*.
+ */
+#define CHECK_XFEATURE(nr) do { \
+ WARN_ON(nr < FIRST_EXTENDED_XFEATURE); \
+ WARN_ON(nr >= XFEATURE_MAX); \
+} while (0)
+
+/*
+ * We could cache this like xstate_size[], but we only use
+ * it here, so it would be a waste of space.
+ */
+static int xfeature_is_aligned(int xfeature_nr)
+{
+ u32 eax, ebx, ecx, edx;
+
+ CHECK_XFEATURE(xfeature_nr);
+ cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
+ /*
+ * The value returned by ECX[1] indicates the alignment
+ * of state component i when the compacted format
+ * of the extended region of an XSAVE area is used
+ */
+ return !!(ecx & 2);
+}
+
+static int xfeature_uncompacted_offset(int xfeature_nr)
+{
+ u32 eax, ebx, ecx, edx;
+
+ CHECK_XFEATURE(xfeature_nr);
+ cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
+ return ebx;
+}
+
+static int xfeature_size(int xfeature_nr)
+{
+ u32 eax, ebx, ecx, edx;
+
+ CHECK_XFEATURE(xfeature_nr);
+ cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
+ return eax;
+}
+
+/*
+ * 'XSAVES' implies two different things:
+ * 1. saving of supervisor/system state
+ * 2. using the compacted format
+ *
+ * Use this function when dealing with the compacted format so
+ * that it is obvious which aspect of 'XSAVES' is being handled
+ * by the calling code.
+ */
+static int using_compacted_format(void)
+{
+ return cpu_has_xsaves;
+}
+
+static void __xstate_dump_leaves(void)
+{
+ int i;
+ u32 eax, ebx, ecx, edx;
+ static int should_dump = 1;
+
+ if (!should_dump)
+ return;
+ should_dump = 0;
+ /*
+ * Dump out a few leaves past the ones that we support
+ * just in case there are some goodies up there
+ */
+ for (i = 0; i < XFEATURE_MAX + 10; i++) {
+ cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
+ pr_warn("CPUID[%02x, %02x]: eax=%08x ebx=%08x ecx=%08x edx=%08x\n",
+ XSTATE_CPUID, i, eax, ebx, ecx, edx);
+ }
+}
+
+#define XSTATE_WARN_ON(x) do { \
+ if (WARN_ONCE(x, "XSAVE consistency problem, dumping leaves")) { \
+ __xstate_dump_leaves(); \
+ } \
+} while (0)
+
+#define XCHECK_SZ(sz, nr, nr_macro, __struct) do { \
+ if ((nr == nr_macro) && \
+ WARN_ONCE(sz != sizeof(__struct), \
+ "%s: struct is %zu bytes, cpu state %d bytes\n", \
+ __stringify(nr_macro), sizeof(__struct), sz)) { \
+ __xstate_dump_leaves(); \
+ } \
+} while (0)
+
+/*
+ * We have a C struct for each 'xstate'. We need to ensure
+ * that our software representation matches what the CPU
+ * tells us about the state's size.
+ */
+static void check_xstate_against_struct(int nr)
+{
+ /*
+ * Ask the CPU for the size of the state.
+ */
+ int sz = xfeature_size(nr);
+ /*
+ * Match each CPU state with the corresponding software
+ * structure.
+ */
+ XCHECK_SZ(sz, nr, XFEATURE_YMM, struct ymmh_struct);
+ XCHECK_SZ(sz, nr, XFEATURE_BNDREGS, struct mpx_bndreg_state);
+ XCHECK_SZ(sz, nr, XFEATURE_BNDCSR, struct mpx_bndcsr_state);
+ XCHECK_SZ(sz, nr, XFEATURE_OPMASK, struct avx_512_opmask_state);
+ XCHECK_SZ(sz, nr, XFEATURE_ZMM_Hi256, struct avx_512_zmm_uppers_state);
+ XCHECK_SZ(sz, nr, XFEATURE_Hi16_ZMM, struct avx_512_hi16_state);
+
+ /*
+ * Make *SURE* to add any feature numbers in below if
+ * there are "holes" in the xsave state component
+ * numbers.
+ */
+ if ((nr < XFEATURE_YMM) ||
+ (nr >= XFEATURE_MAX)) {
+ WARN_ONCE(1, "no structure for xstate: %d\n", nr);
+ XSTATE_WARN_ON(1);
+ }
+}
+
+/*
+ * This essentially double-checks what the cpu told us about
+ * how large the XSAVE buffer needs to be. We are recalculating
+ * it to be safe.
+ */
+static void do_extra_xstate_size_checks(void)
+{
+ int paranoid_xstate_size = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+ int i;
+
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
+ if (!xfeature_enabled(i))
+ continue;
+
+ check_xstate_against_struct(i);
+ /*
+ * Supervisor state components can be managed only by
+ * XSAVES, which is compacted-format only.
+ */
+ if (!using_compacted_format())
+ XSTATE_WARN_ON(xfeature_is_supervisor(i));
+
+ /* Align from the end of the previous feature */
+ if (xfeature_is_aligned(i))
+ paranoid_xstate_size = ALIGN(paranoid_xstate_size, 64);
+ /*
+ * The offset of a given state in the non-compacted
+ * format is given to us in a CPUID leaf. We check
+ * them for being ordered (increasing offsets) in
+ * setup_xstate_features().
+ */
+ if (!using_compacted_format())
+ paranoid_xstate_size = xfeature_uncompacted_offset(i);
+ /*
+ * The compacted-format offset always depends on where
+ * the previous state ended.
+ */
+ paranoid_xstate_size += xfeature_size(i);
+ }
+ XSTATE_WARN_ON(paranoid_xstate_size != xstate_size);
+}
+
/*
* Calculate total size of enabled xstates in XCR0/xfeatures_mask.
+ *
+ * Note the SDM's wording here. "sub-function 0" only enumerates
+ * the size of the *user* states. If we use it to size a buffer
+ * that we use 'XSAVES' on, we could potentially overflow the
+ * buffer because 'XSAVES' saves system states too.
+ *
+ * Note that we do not currently set any bits on IA32_XSS so
+ * 'XCR0 | IA32_XSS == XCR0' for now.
*/
-static void __init init_xstate_size(void)
+static unsigned int __init calculate_xstate_size(void)
{
unsigned int eax, ebx, ecx, edx;
- int i;
+ unsigned int calculated_xstate_size;
if (!cpu_has_xsaves) {
+ /*
+ * - CPUID function 0DH, sub-function 0:
+ * EBX enumerates the size (in bytes) required by
+ * the XSAVE instruction for an XSAVE area
+ * containing all the *user* state components
+ * corresponding to bits currently set in XCR0.
+ */
cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
- xstate_size = ebx;
- return;
+ calculated_xstate_size = ebx;
+ } else {
+ /*
+ * - CPUID function 0DH, sub-function 1:
+ * EBX enumerates the size (in bytes) required by
+ * the XSAVES instruction for an XSAVE area
+ * containing all the state components
+ * corresponding to bits currently set in
+ * XCR0 | IA32_XSS.
+ */
+ cpuid_count(XSTATE_CPUID, 1, &eax, &ebx, &ecx, &edx);
+ calculated_xstate_size = ebx;
}
+ return calculated_xstate_size;
+}
- xstate_size = FXSAVE_SIZE + XSAVE_HDR_SIZE;
- for (i = 2; i < 64; i++) {
- if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
- cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
- xstate_size += eax;
- }
- }
+/*
+ * Will the runtime-enumerated 'xstate_size' fit in the init
+ * task's statically-allocated buffer?
+ */
+static bool is_supported_xstate_size(unsigned int test_xstate_size)
+{
+ if (test_xstate_size <= sizeof(union fpregs_state))
+ return true;
+
+ pr_warn("x86/fpu: xstate buffer too small (%zu < %d), disabling xsave\n",
+ sizeof(union fpregs_state), test_xstate_size);
+ return false;
+}
+
+static int init_xstate_size(void)
+{
+ /* Recompute the context size for enabled features: */
+ unsigned int possible_xstate_size = calculate_xstate_size();
+
+ /* Ensure we have the space to store all enabled: */
+ if (!is_supported_xstate_size(possible_xstate_size))
+ return -EINVAL;
+
+ /*
+ * The size is OK, we are definitely going to use xsave,
+ * make it known to the world that we need more space.
+ */
+ xstate_size = possible_xstate_size;
+ do_extra_xstate_size_checks();
+ return 0;
+}
+
+/*
+ * We enabled the XSAVE hardware, but something went wrong and
+ * we can not use it. Disable it.
+ */
+static void fpu__init_disable_system_xstate(void)
+{
+ xfeatures_mask = 0;
+ cr4_clear_bits(X86_CR4_OSXSAVE);
+ fpu__xstate_clear_all_cpu_caps();
}
/*
@@ -321,6 +609,7 @@ void __init fpu__init_system_xstate(void)
{
unsigned int eax, ebx, ecx, edx;
static int on_boot_cpu = 1;
+ int err;
WARN_ON_FPU(!on_boot_cpu);
on_boot_cpu = 0;
@@ -338,7 +627,7 @@ void __init fpu__init_system_xstate(void)
cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
xfeatures_mask = eax + ((u64)edx << 32);
- if ((xfeatures_mask & XSTATE_FPSSE) != XSTATE_FPSSE) {
+ if ((xfeatures_mask & XFEATURE_MASK_FPSSE) != XFEATURE_MASK_FPSSE) {
pr_err("x86/fpu: FP/SSE not present amongst the CPU's xstate features: 0x%llx.\n", xfeatures_mask);
BUG();
}
@@ -348,16 +637,19 @@ void __init fpu__init_system_xstate(void)
/* Enable xstate instructions to be able to continue with initialization: */
fpu__init_cpu_xstate();
-
- /* Recompute the context size for enabled features: */
- init_xstate_size();
+ err = init_xstate_size();
+ if (err) {
+ /* something went wrong, boot without any XSAVE support */
+ fpu__init_disable_system_xstate();
+ return;
+ }
update_regset_xstate_info(xstate_size, xfeatures_mask);
fpu__init_prepare_fx_sw_frame();
setup_init_fpu_buf();
setup_xstate_comp();
- pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is 0x%x bytes, using '%s' format.\n",
+ pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is %d bytes, using '%s' format.\n",
xfeatures_mask,
xstate_size,
cpu_has_xsaves ? "compacted" : "standard");
@@ -388,7 +680,7 @@ void fpu__resume_cpu(void)
* Inputs:
* xstate: the thread's storage area for all FPU data
* xstate_feature: state which is defined in xsave.h (e.g.
- * XSTATE_FP, XSTATE_SSE, etc...)
+ * XFEATURE_MASK_FP, XFEATURE_MASK_SSE, etc...)
* Output:
* address of the state in the xsave area, or NULL if the
* field is not present in the xsave buffer.
@@ -439,8 +731,8 @@ EXPORT_SYMBOL_GPL(get_xsave_addr);
* Note that this only works on the current task.
*
* Inputs:
- * @xsave_state: state which is defined in xsave.h (e.g. XSTATE_FP,
- * XSTATE_SSE, etc...)
+ * @xsave_state: state which is defined in xsave.h (e.g. XFEATURE_MASK_FP,
+ * XFEATURE_MASK_SSE, etc...)
* Output:
* address of the state in the xsave area or NULL if the state
* is not present or is in its 'init state'.
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 346eec73f7db..ade185a46b1d 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -361,7 +361,7 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
{
- const struct bndcsr *bndcsr;
+ const struct mpx_bndcsr *bndcsr;
siginfo_t *info;
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
@@ -384,7 +384,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
* which is all zeros which indicates MPX was not
* responsible for the exception.
*/
- bndcsr = get_xsave_field_ptr(XSTATE_BNDCSR);
+ bndcsr = get_xsave_field_ptr(XFEATURE_MASK_BNDCSR);
if (!bndcsr)
goto exit_trap;
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2fbea2544f24..156441bcaac8 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -30,7 +30,7 @@ static u32 xstate_required_size(u64 xstate_bv, bool compacted)
int feature_bit = 0;
u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
- xstate_bv &= XSTATE_EXTEND_MASK;
+ xstate_bv &= XFEATURE_MASK_EXTEND;
while (xstate_bv) {
if (xstate_bv & 0x1) {
u32 eax, ebx, ecx, edx, offset;
@@ -51,7 +51,7 @@ u64 kvm_supported_xcr0(void)
u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0;
if (!kvm_x86_ops->mpx_supported())
- xcr0 &= ~(XSTATE_BNDREGS | XSTATE_BNDCSR);
+ xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
return xcr0;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a60bdbccff51..2d4e54db49af 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -662,9 +662,9 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
/* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
if (index != XCR_XFEATURE_ENABLED_MASK)
return 1;
- if (!(xcr0 & XSTATE_FP))
+ if (!(xcr0 & XFEATURE_MASK_FP))
return 1;
- if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
+ if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE))
return 1;
/*
@@ -672,23 +672,24 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
* saving. However, xcr0 bit 0 is always set, even if the
* emulated CPU does not support XSAVE (see fx_init).
*/
- valid_bits = vcpu->arch.guest_supported_xcr0 | XSTATE_FP;
+ valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
if (xcr0 & ~valid_bits)
return 1;
- if ((!(xcr0 & XSTATE_BNDREGS)) != (!(xcr0 & XSTATE_BNDCSR)))
+ if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) !=
+ (!(xcr0 & XFEATURE_MASK_BNDCSR)))
return 1;
- if (xcr0 & XSTATE_AVX512) {
- if (!(xcr0 & XSTATE_YMM))
+ if (xcr0 & XFEATURE_MASK_AVX512) {
+ if (!(xcr0 & XFEATURE_MASK_YMM))
return 1;
- if ((xcr0 & XSTATE_AVX512) != XSTATE_AVX512)
+ if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
return 1;
}
kvm_put_guest_xcr0(vcpu);
vcpu->arch.xcr0 = xcr0;
- if ((xcr0 ^ old_xcr0) & XSTATE_EXTEND_MASK)
+ if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
kvm_update_cpuid(vcpu);
return 0;
}
@@ -2906,7 +2907,7 @@ static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
* Copy each region from the possibly compacted offset to the
* non-compacted offset.
*/
- valid = xstate_bv & ~XSTATE_FPSSE;
+ valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
while (valid) {
u64 feature = valid & -valid;
int index = fls64(feature) - 1;
@@ -2944,7 +2945,7 @@ static void load_xsave(struct kvm_vcpu *vcpu, u8 *src)
* Copy each region from the non-compacted offset to the
* possibly compacted offset.
*/
- valid = xstate_bv & ~XSTATE_FPSSE;
+ valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
while (valid) {
u64 feature = valid & -valid;
int index = fls64(feature) - 1;
@@ -2972,7 +2973,7 @@ static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
&vcpu->arch.guest_fpu.state.fxsave,
sizeof(struct fxregs_state));
*(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
- XSTATE_FPSSE;
+ XFEATURE_MASK_FPSSE;
}
}
@@ -2992,7 +2993,7 @@ static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
return -EINVAL;
load_xsave(vcpu, (u8 *)guest_xsave->region);
} else {
- if (xstate_bv & ~XSTATE_FPSSE)
+ if (xstate_bv & ~XFEATURE_MASK_FPSSE)
return -EINVAL;
memcpy(&vcpu->arch.guest_fpu.state.fxsave,
guest_xsave->region, sizeof(struct fxregs_state));
@@ -7001,7 +7002,7 @@ static void fx_init(struct kvm_vcpu *vcpu)
/*
* Ensure guest xcr0 is valid for loading
*/
- vcpu->arch.xcr0 = XSTATE_FP;
+ vcpu->arch.xcr0 = XFEATURE_MASK_FP;
vcpu->arch.cr0 |= X86_CR0_ET;
}
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 2f822cd886c2..f2afa5fe48a6 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -180,9 +180,9 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
bool kvm_mtrr_check_gfn_range_consistency(struct kvm_vcpu *vcpu, gfn_t gfn,
int page_num);
-#define KVM_SUPPORTED_XCR0 (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
- | XSTATE_BNDREGS | XSTATE_BNDCSR \
- | XSTATE_AVX512)
+#define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
+ | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
+ | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512)
extern u64 host_xcr0;
extern u64 kvm_supported_xcr0(void);
diff --git a/arch/x86/math-emu/fpu_aux.c b/arch/x86/math-emu/fpu_aux.c
index dd76a05729b0..024f6e971174 100644
--- a/arch/x86/math-emu/fpu_aux.c
+++ b/arch/x86/math-emu/fpu_aux.c
@@ -169,6 +169,76 @@ void fxch_i(void)
fpu_tag_word = tag_word;
}
+static void fcmovCC(void)
+{
+ /* fcmovCC st(i) */
+ int i = FPU_rm;
+ FPU_REG *st0_ptr = &st(0);
+ FPU_REG *sti_ptr = &st(i);
+ long tag_word = fpu_tag_word;
+ int regnr = top & 7;
+ int regnri = (top + i) & 7;
+ u_char sti_tag = (tag_word >> (regnri * 2)) & 3;
+
+ if (sti_tag == TAG_Empty) {
+ FPU_stack_underflow();
+ clear_C1();
+ return;
+ }
+ reg_copy(sti_ptr, st0_ptr);
+ tag_word &= ~(3 << (regnr * 2));
+ tag_word |= (sti_tag << (regnr * 2));
+ fpu_tag_word = tag_word;
+}
+
+void fcmovb(void)
+{
+ if (FPU_EFLAGS & X86_EFLAGS_CF)
+ fcmovCC();
+}
+
+void fcmove(void)
+{
+ if (FPU_EFLAGS & X86_EFLAGS_ZF)
+ fcmovCC();
+}
+
+void fcmovbe(void)
+{
+ if (FPU_EFLAGS & (X86_EFLAGS_CF|X86_EFLAGS_ZF))
+ fcmovCC();
+}
+
+void fcmovu(void)
+{
+ if (FPU_EFLAGS & X86_EFLAGS_PF)
+ fcmovCC();
+}
+
+void fcmovnb(void)
+{
+ if (!(FPU_EFLAGS & X86_EFLAGS_CF))
+ fcmovCC();
+}
+
+void fcmovne(void)
+{
+ if (!(FPU_EFLAGS & X86_EFLAGS_ZF))
+ fcmovCC();
+}
+
+void fcmovnbe(void)
+{
+ if (!(FPU_EFLAGS & (X86_EFLAGS_CF|X86_EFLAGS_ZF)))
+ fcmovCC();
+}
+
+void fcmovnu(void)
+{
+ if (!(FPU_EFLAGS & X86_EFLAGS_PF))
+ fcmovCC();
+}
+
void ffree_(void)
{
/* ffree st(i) */
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 3d8f2e421466..e945fedf1de2 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -40,49 +40,33 @@
#define __BAD__ FPU_illegal /* Illegal on an 80486, causes SIGILL */
-#ifndef NO_UNDOC_CODE /* Un-documented FPU op-codes supported by default. */
+/* fcmovCC and f(u)comi(p) are enabled if CPUID(1).EDX(15) "cmov" is set */
-/* WARNING: These codes are not documented by Intel in their 80486 manual
- and may not work on FPU clones or later Intel FPUs. */
-
-/* Changes to support the un-doc codes provided by Linus Torvalds. */
-
-#define _d9_d8_ fstp_i /* unofficial code (19) */
-#define _dc_d0_ fcom_st /* unofficial code (14) */
-#define _dc_d8_ fcompst /* unofficial code (1c) */
-#define _dd_c8_ fxch_i /* unofficial code (0d) */
-#define _de_d0_ fcompst /* unofficial code (16) */
-#define _df_c0_ ffreep /* unofficial code (07) ffree + pop */
-#define _df_c8_ fxch_i /* unofficial code (0f) */
-#define _df_d0_ fstp_i /* unofficial code (17) */
-#define _df_d8_ fstp_i /* unofficial code (1f) */
+/* WARNING: "u" entries are not documented by Intel in their 80486 manual
+ and may not work on FPU clones or later Intel FPUs.
+ Changes to support them provided by Linus Torvalds. */
static FUNC const st_instr_table[64] = {
- fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, _df_c0_,
- fmul__, fxch_i, __BAD__, __BAD__, fmul_i, _dd_c8_, fmulp_, _df_c8_,
- fcom_st, fp_nop, __BAD__, __BAD__, _dc_d0_, fst_i_, _de_d0_, _df_d0_,
- fcompst, _d9_d8_, __BAD__, __BAD__, _dc_d8_, fstp_i, fcompp, _df_d8_,
- fsub__, FPU_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_,
- fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__,
- fdiv__, FPU_triga, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__,
- fdivr_, FPU_trigb, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__,
+/* Opcode: d8 d9 da db */
+/* dc dd de df */
+/* c0..7 */ fadd__, fld_i_, fcmovb, fcmovnb,
+/* c0..7 */ fadd_i, ffree_, faddp_, ffreep,/*u*/
+/* c8..f */ fmul__, fxch_i, fcmove, fcmovne,
+/* c8..f */ fmul_i, fxch_i,/*u*/ fmulp_, fxch_i,/*u*/
+/* d0..7 */ fcom_st, fp_nop, fcmovbe, fcmovnbe,
+/* d0..7 */ fcom_st,/*u*/ fst_i_, fcompst,/*u*/ fstp_i,/*u*/
+/* d8..f */ fcompst, fstp_i,/*u*/ fcmovu, fcmovnu,
+/* d8..f */ fcompst,/*u*/ fstp_i, fcompp, fstp_i,/*u*/
+/* e0..7 */ fsub__, FPU_etc, __BAD__, finit_,
+/* e0..7 */ fsubri, fucom_, fsubrp, fstsw_,
+/* e8..f */ fsubr_, fconst, fucompp, fucomi_,
+/* e8..f */ fsub_i, fucomp, fsubp_, fucomip,
+/* f0..7 */ fdiv__, FPU_triga, __BAD__, fcomi_,
+/* f0..7 */ fdivri, __BAD__, fdivrp, fcomip,
+/* f8..f */ fdivr_, FPU_trigb, __BAD__, __BAD__,
+/* f8..f */ fdiv_i, __BAD__, fdivp_, __BAD__,
};
-#else /* Support only documented FPU op-codes */
-
-static FUNC const st_instr_table[64] = {
- fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, __BAD__,
- fmul__, fxch_i, __BAD__, __BAD__, fmul_i, __BAD__, fmulp_, __BAD__,
- fcom_st, fp_nop, __BAD__, __BAD__, __BAD__, fst_i_, __BAD__, __BAD__,
- fcompst, __BAD__, __BAD__, __BAD__, __BAD__, fstp_i, fcompp, __BAD__,
- fsub__, FPU_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_,
- fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__,
- fdiv__, FPU_triga, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__,
- fdivr_, FPU_trigb, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__,
-};
-
-#endif /* NO_UNDOC_CODE */
-
#define _NONE_ 0 /* Take no special action */
#define _REG0_ 1 /* Need to check for not empty st(0) */
#define _REGI_ 2 /* Need to check for not empty st(0) and st(rm) */
@@ -94,36 +78,18 @@ static FUNC const st_instr_table[64] = {
#define _REGIc 0 /* Compare st(0) and st(rm) */
#define _REGIn 0 /* Uses st(0) and st(rm), but handle checks later */
-#ifndef NO_UNDOC_CODE
-
-/* Un-documented FPU op-codes supported by default. (see above) */
-
static u_char const type_table[64] = {
- _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_,
- _REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_,
- _REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
- _REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
- _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
- _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
- _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
- _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
+/* Opcode: d8 d9 da db dc dd de df */
+/* c0..7 */ _REGI_, _NONE_, _REGIn, _REGIn, _REGIi, _REGi_, _REGIp, _REGi_,
+/* c8..f */ _REGI_, _REGIn, _REGIn, _REGIn, _REGIi, _REGI_, _REGIp, _REGI_,
+/* d0..7 */ _REGIc, _NONE_, _REGIn, _REGIn, _REGIc, _REG0_, _REGIc, _REG0_,
+/* d8..f */ _REGIc, _REG0_, _REGIn, _REGIn, _REGIc, _REG0_, _REGIc, _REG0_,
+/* e0..7 */ _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
+/* e8..f */ _REGI_, _NONE_, _REGIc, _REGIc, _REGIi, _REGIc, _REGIp, _REGIc,
+/* f0..7 */ _REGI_, _NONE_, _null_, _REGIc, _REGIi, _null_, _REGIp, _REGIc,
+/* f8..f */ _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
};
-#else /* Support only documented FPU op-codes */
-
-static u_char const type_table[64] = {
- _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _null_,
- _REGI_, _REGIn, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
- _REGIc, _NONE_, _null_, _null_, _null_, _REG0_, _null_, _null_,
- _REGIc, _null_, _null_, _null_, _null_, _REG0_, _REGIc, _null_,
- _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
- _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
- _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
- _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
-};
-
-#endif /* NO_UNDOC_CODE */
-
#ifdef RE_ENTRANT_CHECKING
u_char emulating = 0;
#endif /* RE_ENTRANT_CHECKING */
diff --git a/arch/x86/math-emu/fpu_proto.h b/arch/x86/math-emu/fpu_proto.h
index 9779df436b7d..caff438b9c1d 100644
--- a/arch/x86/math-emu/fpu_proto.h
+++ b/arch/x86/math-emu/fpu_proto.h
@@ -46,6 +46,14 @@ extern void fstsw_(void);
extern void fp_nop(void);
extern void fld_i_(void);
extern void fxch_i(void);
+extern void fcmovb(void);
+extern void fcmove(void);
+extern void fcmovbe(void);
+extern void fcmovu(void);
+extern void fcmovnb(void);
+extern void fcmovne(void);
+extern void fcmovnbe(void);
+extern void fcmovnu(void);
extern void ffree_(void);
extern void ffreep(void);
extern void fst_i_(void);
@@ -108,6 +116,10 @@ extern void fcompp(void);
extern void fucom_(void);
extern void fucomp(void);
extern void fucompp(void);
+extern void fcomi_(void);
+extern void fcomip(void);
+extern void fucomi_(void);
+extern void fucomip(void);
/* reg_constant.c */
extern void fconst(void);
/* reg_ld_str.c */
diff --git a/arch/x86/math-emu/load_store.c b/arch/x86/math-emu/load_store.c
index 2931ff355218..95228ff042c0 100644
--- a/arch/x86/math-emu/load_store.c
+++ b/arch/x86/math-emu/load_store.c
@@ -33,11 +33,12 @@
#define pop_0() { FPU_settag0(TAG_Empty); top++; }
+/* index is a 5-bit value: (3-bit FPU_modrm.reg field | opcode[2,1]) */
static u_char const type_table[32] = {
- _PUSH_, _PUSH_, _PUSH_, _PUSH_,
- _null_, _null_, _null_, _null_,
- _REG0_, _REG0_, _REG0_, _REG0_,
- _REG0_, _REG0_, _REG0_, _REG0_,
+ _PUSH_, _PUSH_, _PUSH_, _PUSH_, /* /0: d9:fld f32, db:fild m32, dd:fld f64, df:fild m16 */
+ _null_, _REG0_, _REG0_, _REG0_, /* /1: d9:undef, db,dd,df:fisttp m32/64/16 */
+ _REG0_, _REG0_, _REG0_, _REG0_, /* /2: d9:fst f32, db:fist m32, dd:fst f64, df:fist m16 */
+ _REG0_, _REG0_, _REG0_, _REG0_, /* /3: d9:fstp f32, db:fistp m32, dd:fstp f64, df:fistp m16 */
_NONE_, _null_, _NONE_, _PUSH_,
_NONE_, _PUSH_, _null_, _PUSH_,
_NONE_, _null_, _NONE_, _REG0_,
@@ -45,15 +46,19 @@ static u_char const type_table[32] = {
};
u_char const data_sizes_16[32] = {
- 4, 4, 8, 2, 0, 0, 0, 0,
- 4, 4, 8, 2, 4, 4, 8, 2,
+ 4, 4, 8, 2,
+ 0, 4, 8, 2, /* /1: d9:undef, db,dd,df:fisttp */
+ 4, 4, 8, 2,
+ 4, 4, 8, 2,
14, 0, 94, 10, 2, 10, 0, 8,
14, 0, 94, 10, 2, 10, 2, 8
};
static u_char const data_sizes_32[32] = {
- 4, 4, 8, 2, 0, 0, 0, 0,
- 4, 4, 8, 2, 4, 4, 8, 2,
+ 4, 4, 8, 2,
+ 0, 4, 8, 2, /* /1: d9:undef, db,dd,df:fisttp */
+ 4, 4, 8, 2,
+ 4, 4, 8, 2,
28, 0, 108, 10, 2, 10, 0, 8,
28, 0, 108, 10, 2, 10, 2, 8
};
@@ -65,6 +70,7 @@ int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
FPU_REG *st0_ptr;
u_char st0_tag = TAG_Empty; /* This is just to stop a gcc warning. */
u_char loaded_tag;
+ int sv_cw;
st0_ptr = NULL; /* Initialized just to stop compiler warnings. */
@@ -111,7 +117,8 @@ int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
}
switch (type) {
- case 000: /* fld m32real */
+ /* type is a 5-bit value: (3-bit FPU_modrm.reg field | opcode[2,1]) */
+ case 000: /* fld m32real (d9 /0) */
clear_C1();
loaded_tag =
FPU_load_single((float __user *)data_address, &loaded_data);
@@ -123,13 +130,13 @@ int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
}
FPU_copy_to_reg0(&loaded_data, loaded_tag);
break;
- case 001: /* fild m32int */
+ case 001: /* fild m32int (db /0) */
clear_C1();
loaded_tag =
FPU_load_int32((long __user *)data_address, &loaded_data);
FPU_copy_to_reg0(&loaded_data, loaded_tag);
break;
- case 002: /* fld m64real */
+ case 002: /* fld m64real (dd /0) */
clear_C1();
loaded_tag =
FPU_load_double((double __user *)data_address,
@@ -142,12 +149,44 @@ int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
}
FPU_copy_to_reg0(&loaded_data, loaded_tag);
break;
- case 003: /* fild m16int */
+ case 003: /* fild m16int (df /0) */
clear_C1();
loaded_tag =
FPU_load_int16((short __user *)data_address, &loaded_data);
FPU_copy_to_reg0(&loaded_data, loaded_tag);
break;
+ /* case 004: undefined (d9 /1) */
+ /* fisttp are enabled if CPUID(1).ECX(0) "sse3" is set */
+ case 005: /* fisttp m32int (db /1) */
+ clear_C1();
+ sv_cw = control_word;
+ control_word |= RC_CHOP;
+ if (FPU_store_int32
+ (st0_ptr, st0_tag, (long __user *)data_address))
+ pop_0(); /* pop only if the number was actually stored
+ (see the 80486 manual p16-28) */
+ control_word = sv_cw;
+ break;
+ case 006: /* fisttp m64int (dd /1) */
+ clear_C1();
+ sv_cw = control_word;
+ control_word |= RC_CHOP;
+ if (FPU_store_int64
+ (st0_ptr, st0_tag, (long long __user *)data_address))
+ pop_0(); /* pop only if the number was actually stored
+ (see the 80486 manual p16-28) */
+ control_word = sv_cw;
+ break;
+ case 007: /* fisttp m16int (df /1) */
+ clear_C1();
+ sv_cw = control_word;
+ control_word |= RC_CHOP;
+ if (FPU_store_int16
+ (st0_ptr, st0_tag, (short __user *)data_address))
+ pop_0(); /* pop only if the number was actually stored
+ (see the 80486 manual p16-28) */
+ control_word = sv_cw;
+ break;
case 010: /* fst m32real */
clear_C1();
FPU_store_single(st0_ptr, st0_tag,
diff --git a/arch/x86/math-emu/reg_compare.c b/arch/x86/math-emu/reg_compare.c
index ecce55fc2e2e..b77360fdbf4a 100644
--- a/arch/x86/math-emu/reg_compare.c
+++ b/arch/x86/math-emu/reg_compare.c
@@ -249,6 +249,54 @@ static int compare_st_st(int nr)
return 0;
}
+static int compare_i_st_st(int nr)
+{
+ int f, c;
+ FPU_REG *st_ptr;
+
+ if (!NOT_EMPTY(0) || !NOT_EMPTY(nr)) {
+ FPU_EFLAGS |= (X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF);
+ /* Stack fault */
+ EXCEPTION(EX_StackUnder);
+ return !(control_word & CW_Invalid);
+ }
+
+ partial_status &= ~SW_C0;
+ st_ptr = &st(nr);
+ c = compare(st_ptr, FPU_gettagi(nr));
+ if (c & COMP_NaN) {
+ FPU_EFLAGS |= (X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF);
+ EXCEPTION(EX_Invalid);
+ return !(control_word & CW_Invalid);
+ }
+
+ switch (c & 7) {
+ case COMP_A_lt_B:
+ f = X86_EFLAGS_CF;
+ break;
+ case COMP_A_eq_B:
+ f = X86_EFLAGS_ZF;
+ break;
+ case COMP_A_gt_B:
+ f = 0;
+ break;
+ case COMP_No_Comp:
+ f = X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF;
+ break;
+#ifdef PARANOID
+ default:
+ EXCEPTION(EX_INTERNAL | 0x122);
+ f = 0;
+ break;
+#endif /* PARANOID */
+ }
+ FPU_EFLAGS = (FPU_EFLAGS & ~(X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF)) | f;
+ if (c & COMP_Denormal) {
+ return denormal_operand() < 0;
+ }
+ return 0;
+}
+
static int compare_u_st_st(int nr)
{
int f = 0, c;
@@ -299,6 +347,58 @@ static int compare_u_st_st(int nr)
return 0;
}
+static int compare_ui_st_st(int nr)
+{
+ int f = 0, c;
+ FPU_REG *st_ptr;
+
+ if (!NOT_EMPTY(0) || !NOT_EMPTY(nr)) {
+ FPU_EFLAGS |= (X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF);
+ /* Stack fault */
+ EXCEPTION(EX_StackUnder);
+ return !(control_word & CW_Invalid);
+ }
+
+ partial_status &= ~SW_C0;
+ st_ptr = &st(nr);
+ c = compare(st_ptr, FPU_gettagi(nr));
+ if (c & COMP_NaN) {
+ FPU_EFLAGS |= (X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF);
+ if (c & COMP_SNaN) { /* This is the only difference between
+ un-ordered and ordinary comparisons */
+ EXCEPTION(EX_Invalid);
+ return !(control_word & CW_Invalid);
+ }
+ return 0;
+ }
+
+ switch (c & 7) {
+ case COMP_A_lt_B:
+ f = X86_EFLAGS_CF;
+ break;
+ case COMP_A_eq_B:
+ f = X86_EFLAGS_ZF;
+ break;
+ case COMP_A_gt_B:
+ f = 0;
+ break;
+ case COMP_No_Comp:
+ f = X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF;
+ break;
+#ifdef PARANOID
+ default:
+ EXCEPTION(EX_INTERNAL | 0x123);
+ f = 0;
+ break;
+#endif /* PARANOID */
+ }
+ FPU_EFLAGS = (FPU_EFLAGS & ~(X86_EFLAGS_ZF | X86_EFLAGS_PF | X86_EFLAGS_CF)) | f;
+ if (c & COMP_Denormal) {
+ return denormal_operand() < 0;
+ }
+ return 0;
+}
+
/*---------------------------------------------------------------------------*/
void fcom_st(void)
@@ -348,3 +448,31 @@ void fucompp(void)
} else
FPU_illegal();
}
+
+/* P6+ compare-to-EFLAGS ops */
+
+void fcomi_(void)
+{
+ /* fcomi st(i) */
+ compare_i_st_st(FPU_rm);
+}
+
+void fcomip(void)
+{
+ /* fcomip st(i) */
+ if (!compare_i_st_st(FPU_rm))
+ FPU_pop();
+}
+
+void fucomi_(void)
+{
+ /* fucomi st(i) */
+ compare_ui_st_st(FPU_rm);
+}
+
+void fucomip(void)
+{
+ /* fucomip st(i) */
+ if (!compare_ui_st_st(FPU_rm))
+ FPU_pop();
+}
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index 134948b0926f..b0ae85f90f10 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -237,7 +237,8 @@ static int mpx_insn_decode(struct insn *insn,
*/
siginfo_t *mpx_generate_siginfo(struct pt_regs *regs)
{
- const struct bndreg *bndregs, *bndreg;
+ const struct mpx_bndreg_state *bndregs;
+ const struct mpx_bndreg *bndreg;
siginfo_t *info = NULL;
struct insn insn;
uint8_t bndregno;
@@ -258,13 +259,13 @@ siginfo_t *mpx_generate_siginfo(struct pt_regs *regs)
goto err_out;
}
/* get bndregs field from current task's xsave area */
- bndregs = get_xsave_field_ptr(XSTATE_BNDREGS);
+ bndregs = get_xsave_field_ptr(XFEATURE_MASK_BNDREGS);
if (!bndregs) {
err = -EINVAL;
goto err_out;
}
/* now go select the individual register in the set of 4 */
- bndreg = &bndregs[bndregno];
+ bndreg = &bndregs->bndreg[bndregno];
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
@@ -306,7 +307,7 @@ siginfo_t *mpx_generate_siginfo(struct pt_regs *regs)
static __user void *mpx_get_bounds_dir(void)
{
- const struct bndcsr *bndcsr;
+ const struct mpx_bndcsr *bndcsr;
if (!cpu_feature_enabled(X86_FEATURE_MPX))
return MPX_INVALID_BOUNDS_DIR;
@@ -315,7 +316,7 @@ static __user void *mpx_get_bounds_dir(void)
* The bounds directory pointer is stored in a register
* only accessible if we first do an xsave.
*/
- bndcsr = get_xsave_field_ptr(XSTATE_BNDCSR);
+ bndcsr = get_xsave_field_ptr(XFEATURE_MASK_BNDCSR);
if (!bndcsr)
return MPX_INVALID_BOUNDS_DIR;
@@ -489,10 +490,10 @@ static int allocate_bt(struct mm_struct *mm, long __user *bd_entry)
static int do_mpx_bt_fault(void)
{
unsigned long bd_entry, bd_base;
- const struct bndcsr *bndcsr;
+ const struct mpx_bndcsr *bndcsr;
struct mm_struct *mm = current->mm;
- bndcsr = get_xsave_field_ptr(XSTATE_BNDCSR);
+ bndcsr = get_xsave_field_ptr(XFEATURE_MASK_BNDCSR);
if (!bndcsr)
return -EINVAL;
/*
diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index 29089b24d18b..7145b3d9030c 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -5,7 +5,8 @@ include ../lib.mk
.PHONY: all all_32 all_64 warn_32bit_failure clean
TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs ldt_gdt syscall_nt
-TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault sigreturn
+TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault sigreturn \
+ test_FCMOV test_FCOMI test_FISTTP
TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)
BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)
@@ -35,7 +36,7 @@ all_64: $(BINARIES_64)
$(RM) $(BINARIES_32) $(BINARIES_64)
$(TARGETS_C_32BIT_ALL:%=%_32): %_32: %.c
- $(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
+ $(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl -lm
$(TARGETS_C_BOTHBITS:%=%_64): %_64: %.c
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
diff --git a/tools/testing/selftests/x86/test_FCMOV.c b/tools/testing/selftests/x86/test_FCMOV.c
new file mode 100644
index 000000000000..4adcca0c80c4
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FCMOV.c
@@ -0,0 +1,93 @@
+#undef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#undef __USE_GNU
+#define __USE_GNU 1
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#define TEST(insn) \
+long double __attribute__((noinline)) insn(long flags) \
+{ \
+ long double out; \
+ asm ("\n" \
+ " push %1""\n" \
+ " popf""\n" \
+ " fldpi""\n" \
+ " fld1""\n" \
+ " " #insn " %%st(1), %%st" "\n" \
+ " ffree %%st(1)" "\n" \
+ : "=t" (out) \
+ : "r" (flags) \
+ ); \
+ return out; \
+}
+
+TEST(fcmovb)
+TEST(fcmove)
+TEST(fcmovbe)
+TEST(fcmovu)
+TEST(fcmovnb)
+TEST(fcmovne)
+TEST(fcmovnbe)
+TEST(fcmovnu)
+
+enum {
+ CF = 1 << 0,
+ PF = 1 << 2,
+ ZF = 1 << 6,
+};
+
+void sighandler(int sig)
+{
+ printf("[FAIL]\tGot signal %d, exiting\n", sig);
+ exit(1);
+}
+
+int main(int argc, char **argv, char **envp)
+{
+ int err = 0;
+
+ /* SIGILL triggers on 32-bit kernels w/o fcomi emulation
+ * when run with "no387 nofxsr". Other signals are caught
+ * just in case.
+ */
+ signal(SIGILL, sighandler);
+ signal(SIGFPE, sighandler);
+ signal(SIGSEGV, sighandler);
+
+ printf("[RUN]\tTesting fcmovCC instructions\n");
+ /* If fcmovCC() returns 1.0, the move wasn't done */
+ err |= !(fcmovb(0) == 1.0); err |= !(fcmovnb(0) != 1.0);
+ err |= !(fcmove(0) == 1.0); err |= !(fcmovne(0) != 1.0);
+ err |= !(fcmovbe(0) == 1.0); err |= !(fcmovnbe(0) != 1.0);
+ err |= !(fcmovu(0) == 1.0); err |= !(fcmovnu(0) != 1.0);
+
+ err |= !(fcmovb(CF) != 1.0); err |= !(fcmovnb(CF) == 1.0);
+ err |= !(fcmove(CF) == 1.0); err |= !(fcmovne(CF) != 1.0);
+ err |= !(fcmovbe(CF) != 1.0); err |= !(fcmovnbe(CF) == 1.0);
+ err |= !(fcmovu(CF) == 1.0); err |= !(fcmovnu(CF) != 1.0);
+
+ err |= !(fcmovb(ZF) == 1.0); err |= !(fcmovnb(ZF) != 1.0);
+ err |= !(fcmove(ZF) != 1.0); err |= !(fcmovne(ZF) == 1.0);
+ err |= !(fcmovbe(ZF) != 1.0); err |= !(fcmovnbe(ZF) == 1.0);
+ err |= !(fcmovu(ZF) == 1.0); err |= !(fcmovnu(ZF) != 1.0);
+
+ err |= !(fcmovb(PF) == 1.0); err |= !(fcmovnb(PF) != 1.0);
+ err |= !(fcmove(PF) == 1.0); err |= !(fcmovne(PF) != 1.0);
+ err |= !(fcmovbe(PF) == 1.0); err |= !(fcmovnbe(PF) != 1.0);
+ err |= !(fcmovu(PF) != 1.0); err |= !(fcmovnu(PF) == 1.0);
+
+ if (!err)
+ printf("[OK]\tfcmovCC\n");
+ else
+ printf("[FAIL]\tfcmovCC errors: %d\n", err);
+
+ return err;
+}
diff --git a/tools/testing/selftests/x86/test_FCOMI.c b/tools/testing/selftests/x86/test_FCOMI.c
new file mode 100644
index 000000000000..db4933e31af9
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FCOMI.c
@@ -0,0 +1,331 @@
+#undef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#undef __USE_GNU
+#define __USE_GNU 1
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <fenv.h>
+
+enum {
+ CF = 1 << 0,
+ PF = 1 << 2,
+ ZF = 1 << 6,
+ ARITH = CF | PF | ZF,
+};
+
+long res_fcomi_pi_1;
+long res_fcomi_1_pi;
+long res_fcomi_1_1;
+long res_fcomi_nan_1;
+/* sNaN is s|111 1111 1|1xx xxxx xxxx xxxx xxxx xxxx */
+/* qNaN is s|111 1111 1|0xx xxxx xxxx xxxx xxxx xxxx (some x must be nonzero) */
+int snan = 0x7fc11111;
+int qnan = 0x7f811111;
+unsigned short snan1[5];
+/* sNaN80 is s|111 1111 1111 1111 |10xx xx...xx (some x must be nonzero) */
+unsigned short snan80[5] = { 0x1111, 0x1111, 0x1111, 0x8111, 0x7fff };
+
+int test(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fldpi""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_pi""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fldpi""\n"
+ " fld1""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_pi_1""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fld1""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_1_pi & ARITH) != (0)) {
+ printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
+ return 1;
+ }
+ if ((res_fcomi_pi_1 & ARITH) != (CF)) {
+ printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
+ return 1;
+ }
+ if ((res_fcomi_1_1 & ARITH) != (ZF)) {
+ printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int test_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testu_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fucomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testu_snan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+// " flds snan""\n" // WRONG, this will convert 32-bit fp snan to a *qnan* in 80-bit fp register!
+// " fstpt snan1""\n" // if uncommented, it prints "snan1:7fff c111 1100 0000 0000" - c111, not 8111!
+// " fnclex""\n" // flds of a snan raised FE_INVALID, clear it
+ " fldt snan80""\n" // fldt never raise FE_INVALID
+ " fld1""\n"
+ " fucomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+// printf("snan:%x snan1:%04x %04x %04x %04x %04x\n", snan, snan1[4], snan1[3], snan1[2], snan1[1], snan1[0]);
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testp(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fldpi""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_pi""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fldpi""\n"
+ " fld1""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_pi_1""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fld1""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_1_pi & ARITH) != (0)) {
+ printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
+ return 1;
+ }
+ if ((res_fcomi_pi_1 & ARITH) != (CF)) {
+ printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
+ return 1;
+ }
+ if ((res_fcomi_1_1 & ARITH) != (ZF)) {
+ printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testp_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testup_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fucomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+void sighandler(int sig)
+{
+ printf("[FAIL]\tGot signal %d, exiting\n", sig);
+ exit(1);
+}
+
+int main(int argc, char **argv, char **envp)
+{
+ int err = 0;
+
+ /* SIGILL triggers on 32-bit kernels w/o fcomi emulation
+ * when run with "no387 nofxsr". Other signals are caught
+ * just in case.
+ */
+ signal(SIGILL, sighandler);
+ signal(SIGFPE, sighandler);
+ signal(SIGSEGV, sighandler);
+
+ printf("[RUN]\tTesting f[u]comi[p] instructions\n");
+ err |= test(0);
+ err |= test_qnan(0);
+ err |= testu_qnan(0);
+ err |= testu_snan(0);
+ err |= test(CF|ZF|PF);
+ err |= test_qnan(CF|ZF|PF);
+ err |= testu_qnan(CF|ZF|PF);
+ err |= testu_snan(CF|ZF|PF);
+ err |= testp(0);
+ err |= testp_qnan(0);
+ err |= testup_qnan(0);
+ err |= testp(CF|ZF|PF);
+ err |= testp_qnan(CF|ZF|PF);
+ err |= testup_qnan(CF|ZF|PF);
+ if (!err)
+ printf("[OK]\tf[u]comi[p]\n");
+ else
+ printf("[FAIL]\tf[u]comi[p] errors: %d\n", err);
+
+ return err;
+}
diff --git a/tools/testing/selftests/x86/test_FISTTP.c b/tools/testing/selftests/x86/test_FISTTP.c
new file mode 100644
index 000000000000..b8e61a047f6b
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FISTTP.c
@@ -0,0 +1,137 @@
+#undef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#undef __USE_GNU
+#define __USE_GNU 1
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <fenv.h>
+
+unsigned long long res64 = -1;
+unsigned int res32 = -1;
+unsigned short res16 = -1;
+
+int test(void)
+{
+ int ex;
+
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ asm volatile ("\n"
+ " fld1""\n"
+ " fisttp res16""\n"
+ " fld1""\n"
+ " fisttpl res32""\n"
+ " fld1""\n"
+ " fisttpll res64""\n"
+ : : : "memory"
+ );
+ if (res16 != 1 || res32 != 1 || res64 != 1) {
+ printf("[BAD]\tfisttp 1\n");
+ return 1;
+ }
+ ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ if (ex != 0) {
+ printf("[BAD]\tfisttp 1: wrong exception state\n");
+ return 1;
+ }
+
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ asm volatile ("\n"
+ " fldpi""\n"
+ " fisttp res16""\n"
+ " fldpi""\n"
+ " fisttpl res32""\n"
+ " fldpi""\n"
+ " fisttpll res64""\n"
+ : : : "memory"
+ );
+ if (res16 != 3 || res32 != 3 || res64 != 3) {
+ printf("[BAD]\tfisttp pi\n");
+ return 1;
+ }
+ ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ if (ex != FE_INEXACT) {
+ printf("[BAD]\tfisttp pi: wrong exception state\n");
+ return 1;
+ }
+
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ asm volatile ("\n"
+ " fldpi""\n"
+ " fchs""\n"
+ " fisttp res16""\n"
+ " fldpi""\n"
+ " fchs""\n"
+ " fisttpl res32""\n"
+ " fldpi""\n"
+ " fchs""\n"
+ " fisttpll res64""\n"
+ : : : "memory"
+ );
+ if (res16 != 0xfffd || res32 != 0xfffffffd || res64 != 0xfffffffffffffffdULL) {
+ printf("[BAD]\tfisttp -pi\n");
+ return 1;
+ }
+ ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ if (ex != FE_INEXACT) {
+ printf("[BAD]\tfisttp -pi: wrong exception state\n");
+ return 1;
+ }
+
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ asm volatile ("\n"
+ " fldln2""\n"
+ " fisttp res16""\n"
+ " fldln2""\n"
+ " fisttpl res32""\n"
+ " fldln2""\n"
+ " fisttpll res64""\n"
+ : : : "memory"
+ );
+ /* Test truncation to zero (round-to-nearest would give 1 here) */
+ if (res16 != 0 || res32 != 0 || res64 != 0) {
+ printf("[BAD]\tfisttp ln2\n");
+ return 1;
+ }
+ ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+ if (ex != FE_INEXACT) {
+ printf("[BAD]\tfisttp ln2: wrong exception state\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+void sighandler(int sig)
+{
+ printf("[FAIL]\tGot signal %d, exiting\n", sig);
+ exit(1);
+}
+
+int main(int argc, char **argv, char **envp)
+{
+ int err = 0;
+
+ /* SIGILL triggers on 32-bit kernels w/o fisttp emulation
+ * when run with "no387 nofxsr". Other signals are caught
+ * just in case.
+ */
+ signal(SIGILL, sighandler);
+ signal(SIGFPE, sighandler);
+ signal(SIGSEGV, sighandler);
+
+ printf("[RUN]\tTesting fisttp instructions\n");
+ err |= test();
+ if (!err)
+ printf("[OK]\tfisttp\n");
+ else
+ printf("[FAIL]\tfisttp errors: %d\n", err);
+
+ return err;
+}
--
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