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Message-Id: <1392757731-32619-15-git-send-email-acme@infradead.org>
Date: Tue, 18 Feb 2014 18:08:33 -0300
From: Arnaldo Carvalho de Melo <acme@...radead.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jean Pihet <jean.pihet@...aro.org>,
Namhyung Kim <namhyung@...nel.org>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 14/32] perf callchain: Separate libunwind code to special object
From: Jiri Olsa <jolsa@...hat.com>
We are going to add libdw library support to do dwarf post unwind.
Making the code ready by moving libunwind dwarf post unwind stuff into
separate object.
Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Acked-by: Jean Pihet <jean.pihet@...aro.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jean Pihet <jean.pihet@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1389098853-14466-10-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/Makefile.perf | 2 +-
tools/perf/arch/arm/Makefile | 2 +-
tools/perf/arch/arm/util/unwind-libunwind.c | 48 +++
tools/perf/arch/arm/util/unwind.c | 48 ---
tools/perf/arch/x86/Makefile | 2 +-
tools/perf/arch/x86/util/unwind-libunwind.c | 111 ++++++
tools/perf/arch/x86/util/unwind.c | 111 ------
tools/perf/util/unwind-libunwind.c | 595 ++++++++++++++++++++++++++++
tools/perf/util/unwind.c | 595 ----------------------------
9 files changed, 757 insertions(+), 757 deletions(-)
create mode 100644 tools/perf/arch/arm/util/unwind-libunwind.c
delete mode 100644 tools/perf/arch/arm/util/unwind.c
create mode 100644 tools/perf/arch/x86/util/unwind-libunwind.c
delete mode 100644 tools/perf/arch/x86/util/unwind.c
create mode 100644 tools/perf/util/unwind-libunwind.c
delete mode 100644 tools/perf/util/unwind.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 10fcf331e0e3..9ef6b33bcfe3 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -481,7 +481,7 @@ endif # NO_DWARF
endif # NO_LIBELF
ifndef NO_LIBUNWIND
- LIB_OBJS += $(OUTPUT)util/unwind.o
+ LIB_OBJS += $(OUTPUT)util/unwind-libunwind.o
endif
LIB_OBJS += $(OUTPUT)tests/keep-tracking.o
diff --git a/tools/perf/arch/arm/Makefile b/tools/perf/arch/arm/Makefile
index fe9b61e322a5..67e9b3d38e89 100644
--- a/tools/perf/arch/arm/Makefile
+++ b/tools/perf/arch/arm/Makefile
@@ -3,5 +3,5 @@ PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
ifndef NO_LIBUNWIND
-LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
endif
diff --git a/tools/perf/arch/arm/util/unwind-libunwind.c b/tools/perf/arch/arm/util/unwind-libunwind.c
new file mode 100644
index 000000000000..da3dc950550c
--- /dev/null
+++ b/tools/perf/arch/arm/util/unwind-libunwind.c
@@ -0,0 +1,48 @@
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+
+int unwind__arch_reg_id(int regnum)
+{
+ switch (regnum) {
+ case UNW_ARM_R0:
+ return PERF_REG_ARM_R0;
+ case UNW_ARM_R1:
+ return PERF_REG_ARM_R1;
+ case UNW_ARM_R2:
+ return PERF_REG_ARM_R2;
+ case UNW_ARM_R3:
+ return PERF_REG_ARM_R3;
+ case UNW_ARM_R4:
+ return PERF_REG_ARM_R4;
+ case UNW_ARM_R5:
+ return PERF_REG_ARM_R5;
+ case UNW_ARM_R6:
+ return PERF_REG_ARM_R6;
+ case UNW_ARM_R7:
+ return PERF_REG_ARM_R7;
+ case UNW_ARM_R8:
+ return PERF_REG_ARM_R8;
+ case UNW_ARM_R9:
+ return PERF_REG_ARM_R9;
+ case UNW_ARM_R10:
+ return PERF_REG_ARM_R10;
+ case UNW_ARM_R11:
+ return PERF_REG_ARM_FP;
+ case UNW_ARM_R12:
+ return PERF_REG_ARM_IP;
+ case UNW_ARM_R13:
+ return PERF_REG_ARM_SP;
+ case UNW_ARM_R14:
+ return PERF_REG_ARM_LR;
+ case UNW_ARM_R15:
+ return PERF_REG_ARM_PC;
+ default:
+ pr_err("unwind: invalid reg id %d\n", regnum);
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
diff --git a/tools/perf/arch/arm/util/unwind.c b/tools/perf/arch/arm/util/unwind.c
deleted file mode 100644
index da3dc950550c..000000000000
--- a/tools/perf/arch/arm/util/unwind.c
+++ /dev/null
@@ -1,48 +0,0 @@
-
-#include <errno.h>
-#include <libunwind.h>
-#include "perf_regs.h"
-#include "../../util/unwind.h"
-
-int unwind__arch_reg_id(int regnum)
-{
- switch (regnum) {
- case UNW_ARM_R0:
- return PERF_REG_ARM_R0;
- case UNW_ARM_R1:
- return PERF_REG_ARM_R1;
- case UNW_ARM_R2:
- return PERF_REG_ARM_R2;
- case UNW_ARM_R3:
- return PERF_REG_ARM_R3;
- case UNW_ARM_R4:
- return PERF_REG_ARM_R4;
- case UNW_ARM_R5:
- return PERF_REG_ARM_R5;
- case UNW_ARM_R6:
- return PERF_REG_ARM_R6;
- case UNW_ARM_R7:
- return PERF_REG_ARM_R7;
- case UNW_ARM_R8:
- return PERF_REG_ARM_R8;
- case UNW_ARM_R9:
- return PERF_REG_ARM_R9;
- case UNW_ARM_R10:
- return PERF_REG_ARM_R10;
- case UNW_ARM_R11:
- return PERF_REG_ARM_FP;
- case UNW_ARM_R12:
- return PERF_REG_ARM_IP;
- case UNW_ARM_R13:
- return PERF_REG_ARM_SP;
- case UNW_ARM_R14:
- return PERF_REG_ARM_LR;
- case UNW_ARM_R15:
- return PERF_REG_ARM_PC;
- default:
- pr_err("unwind: invalid reg id %d\n", regnum);
- return -EINVAL;
- }
-
- return -EINVAL;
-}
diff --git a/tools/perf/arch/x86/Makefile b/tools/perf/arch/x86/Makefile
index 948ea6cfd681..4fa9be983ad1 100644
--- a/tools/perf/arch/x86/Makefile
+++ b/tools/perf/arch/x86/Makefile
@@ -3,7 +3,7 @@ PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
ifndef NO_LIBUNWIND
-LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
endif
diff --git a/tools/perf/arch/x86/util/unwind-libunwind.c b/tools/perf/arch/x86/util/unwind-libunwind.c
new file mode 100644
index 000000000000..456a88cf5b37
--- /dev/null
+++ b/tools/perf/arch/x86/util/unwind-libunwind.c
@@ -0,0 +1,111 @@
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+
+#ifdef HAVE_ARCH_X86_64_SUPPORT
+int unwind__arch_reg_id(int regnum)
+{
+ int id;
+
+ switch (regnum) {
+ case UNW_X86_64_RAX:
+ id = PERF_REG_X86_AX;
+ break;
+ case UNW_X86_64_RDX:
+ id = PERF_REG_X86_DX;
+ break;
+ case UNW_X86_64_RCX:
+ id = PERF_REG_X86_CX;
+ break;
+ case UNW_X86_64_RBX:
+ id = PERF_REG_X86_BX;
+ break;
+ case UNW_X86_64_RSI:
+ id = PERF_REG_X86_SI;
+ break;
+ case UNW_X86_64_RDI:
+ id = PERF_REG_X86_DI;
+ break;
+ case UNW_X86_64_RBP:
+ id = PERF_REG_X86_BP;
+ break;
+ case UNW_X86_64_RSP:
+ id = PERF_REG_X86_SP;
+ break;
+ case UNW_X86_64_R8:
+ id = PERF_REG_X86_R8;
+ break;
+ case UNW_X86_64_R9:
+ id = PERF_REG_X86_R9;
+ break;
+ case UNW_X86_64_R10:
+ id = PERF_REG_X86_R10;
+ break;
+ case UNW_X86_64_R11:
+ id = PERF_REG_X86_R11;
+ break;
+ case UNW_X86_64_R12:
+ id = PERF_REG_X86_R12;
+ break;
+ case UNW_X86_64_R13:
+ id = PERF_REG_X86_R13;
+ break;
+ case UNW_X86_64_R14:
+ id = PERF_REG_X86_R14;
+ break;
+ case UNW_X86_64_R15:
+ id = PERF_REG_X86_R15;
+ break;
+ case UNW_X86_64_RIP:
+ id = PERF_REG_X86_IP;
+ break;
+ default:
+ pr_err("unwind: invalid reg id %d\n", regnum);
+ return -EINVAL;
+ }
+
+ return id;
+}
+#else
+int unwind__arch_reg_id(int regnum)
+{
+ int id;
+
+ switch (regnum) {
+ case UNW_X86_EAX:
+ id = PERF_REG_X86_AX;
+ break;
+ case UNW_X86_EDX:
+ id = PERF_REG_X86_DX;
+ break;
+ case UNW_X86_ECX:
+ id = PERF_REG_X86_CX;
+ break;
+ case UNW_X86_EBX:
+ id = PERF_REG_X86_BX;
+ break;
+ case UNW_X86_ESI:
+ id = PERF_REG_X86_SI;
+ break;
+ case UNW_X86_EDI:
+ id = PERF_REG_X86_DI;
+ break;
+ case UNW_X86_EBP:
+ id = PERF_REG_X86_BP;
+ break;
+ case UNW_X86_ESP:
+ id = PERF_REG_X86_SP;
+ break;
+ case UNW_X86_EIP:
+ id = PERF_REG_X86_IP;
+ break;
+ default:
+ pr_err("unwind: invalid reg id %d\n", regnum);
+ return -EINVAL;
+ }
+
+ return id;
+}
+#endif /* HAVE_ARCH_X86_64_SUPPORT */
diff --git a/tools/perf/arch/x86/util/unwind.c b/tools/perf/arch/x86/util/unwind.c
deleted file mode 100644
index 456a88cf5b37..000000000000
--- a/tools/perf/arch/x86/util/unwind.c
+++ /dev/null
@@ -1,111 +0,0 @@
-
-#include <errno.h>
-#include <libunwind.h>
-#include "perf_regs.h"
-#include "../../util/unwind.h"
-
-#ifdef HAVE_ARCH_X86_64_SUPPORT
-int unwind__arch_reg_id(int regnum)
-{
- int id;
-
- switch (regnum) {
- case UNW_X86_64_RAX:
- id = PERF_REG_X86_AX;
- break;
- case UNW_X86_64_RDX:
- id = PERF_REG_X86_DX;
- break;
- case UNW_X86_64_RCX:
- id = PERF_REG_X86_CX;
- break;
- case UNW_X86_64_RBX:
- id = PERF_REG_X86_BX;
- break;
- case UNW_X86_64_RSI:
- id = PERF_REG_X86_SI;
- break;
- case UNW_X86_64_RDI:
- id = PERF_REG_X86_DI;
- break;
- case UNW_X86_64_RBP:
- id = PERF_REG_X86_BP;
- break;
- case UNW_X86_64_RSP:
- id = PERF_REG_X86_SP;
- break;
- case UNW_X86_64_R8:
- id = PERF_REG_X86_R8;
- break;
- case UNW_X86_64_R9:
- id = PERF_REG_X86_R9;
- break;
- case UNW_X86_64_R10:
- id = PERF_REG_X86_R10;
- break;
- case UNW_X86_64_R11:
- id = PERF_REG_X86_R11;
- break;
- case UNW_X86_64_R12:
- id = PERF_REG_X86_R12;
- break;
- case UNW_X86_64_R13:
- id = PERF_REG_X86_R13;
- break;
- case UNW_X86_64_R14:
- id = PERF_REG_X86_R14;
- break;
- case UNW_X86_64_R15:
- id = PERF_REG_X86_R15;
- break;
- case UNW_X86_64_RIP:
- id = PERF_REG_X86_IP;
- break;
- default:
- pr_err("unwind: invalid reg id %d\n", regnum);
- return -EINVAL;
- }
-
- return id;
-}
-#else
-int unwind__arch_reg_id(int regnum)
-{
- int id;
-
- switch (regnum) {
- case UNW_X86_EAX:
- id = PERF_REG_X86_AX;
- break;
- case UNW_X86_EDX:
- id = PERF_REG_X86_DX;
- break;
- case UNW_X86_ECX:
- id = PERF_REG_X86_CX;
- break;
- case UNW_X86_EBX:
- id = PERF_REG_X86_BX;
- break;
- case UNW_X86_ESI:
- id = PERF_REG_X86_SI;
- break;
- case UNW_X86_EDI:
- id = PERF_REG_X86_DI;
- break;
- case UNW_X86_EBP:
- id = PERF_REG_X86_BP;
- break;
- case UNW_X86_ESP:
- id = PERF_REG_X86_SP;
- break;
- case UNW_X86_EIP:
- id = PERF_REG_X86_IP;
- break;
- default:
- pr_err("unwind: invalid reg id %d\n", regnum);
- return -EINVAL;
- }
-
- return id;
-}
-#endif /* HAVE_ARCH_X86_64_SUPPORT */
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
new file mode 100644
index 000000000000..720a4cae6004
--- /dev/null
+++ b/tools/perf/util/unwind-libunwind.c
@@ -0,0 +1,595 @@
+/*
+ * Post mortem Dwarf CFI based unwinding on top of regs and stack dumps.
+ *
+ * Lots of this code have been borrowed or heavily inspired from parts of
+ * the libunwind 0.99 code which are (amongst other contributors I may have
+ * forgotten):
+ *
+ * Copyright (C) 2002-2007 Hewlett-Packard Co
+ * Contributed by David Mosberger-Tang <davidm@....hp.com>
+ *
+ * And the bugs have been added by:
+ *
+ * Copyright (C) 2010, Frederic Weisbecker <fweisbec@...il.com>
+ * Copyright (C) 2012, Jiri Olsa <jolsa@...hat.com>
+ *
+ */
+
+#include <elf.h>
+#include <gelf.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <linux/list.h>
+#include <libunwind.h>
+#include <libunwind-ptrace.h>
+#include "thread.h"
+#include "session.h"
+#include "perf_regs.h"
+#include "unwind.h"
+#include "symbol.h"
+#include "util.h"
+
+extern int
+UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+ unw_word_t ip,
+ unw_dyn_info_t *di,
+ unw_proc_info_t *pi,
+ int need_unwind_info, void *arg);
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+extern int
+UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
+ unw_word_t ip,
+ unw_word_t segbase,
+ const char *obj_name, unw_word_t start,
+ unw_word_t end);
+
+#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)
+
+#define DW_EH_PE_FORMAT_MASK 0x0f /* format of the encoded value */
+#define DW_EH_PE_APPL_MASK 0x70 /* how the value is to be applied */
+
+/* Pointer-encoding formats: */
+#define DW_EH_PE_omit 0xff
+#define DW_EH_PE_ptr 0x00 /* pointer-sized unsigned value */
+#define DW_EH_PE_udata4 0x03 /* unsigned 32-bit value */
+#define DW_EH_PE_udata8 0x04 /* unsigned 64-bit value */
+#define DW_EH_PE_sdata4 0x0b /* signed 32-bit value */
+#define DW_EH_PE_sdata8 0x0c /* signed 64-bit value */
+
+/* Pointer-encoding application: */
+#define DW_EH_PE_absptr 0x00 /* absolute value */
+#define DW_EH_PE_pcrel 0x10 /* rel. to addr. of encoded value */
+
+/*
+ * The following are not documented by LSB v1.3, yet they are used by
+ * GCC, presumably they aren't documented by LSB since they aren't
+ * used on Linux:
+ */
+#define DW_EH_PE_funcrel 0x40 /* start-of-procedure-relative */
+#define DW_EH_PE_aligned 0x50 /* aligned pointer */
+
+/* Flags intentionaly not handled, since they're not needed:
+ * #define DW_EH_PE_indirect 0x80
+ * #define DW_EH_PE_uleb128 0x01
+ * #define DW_EH_PE_udata2 0x02
+ * #define DW_EH_PE_sleb128 0x09
+ * #define DW_EH_PE_sdata2 0x0a
+ * #define DW_EH_PE_textrel 0x20
+ * #define DW_EH_PE_datarel 0x30
+ */
+
+struct unwind_info {
+ struct perf_sample *sample;
+ struct machine *machine;
+ struct thread *thread;
+};
+
+#define dw_read(ptr, type, end) ({ \
+ type *__p = (type *) ptr; \
+ type __v; \
+ if ((__p + 1) > (type *) end) \
+ return -EINVAL; \
+ __v = *__p++; \
+ ptr = (typeof(ptr)) __p; \
+ __v; \
+ })
+
+static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val,
+ u8 encoding)
+{
+ u8 *cur = *p;
+ *val = 0;
+
+ switch (encoding) {
+ case DW_EH_PE_omit:
+ *val = 0;
+ goto out;
+ case DW_EH_PE_ptr:
+ *val = dw_read(cur, unsigned long, end);
+ goto out;
+ default:
+ break;
+ }
+
+ switch (encoding & DW_EH_PE_APPL_MASK) {
+ case DW_EH_PE_absptr:
+ break;
+ case DW_EH_PE_pcrel:
+ *val = (unsigned long) cur;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if ((encoding & 0x07) == 0x00)
+ encoding |= DW_EH_PE_udata4;
+
+ switch (encoding & DW_EH_PE_FORMAT_MASK) {
+ case DW_EH_PE_sdata4:
+ *val += dw_read(cur, s32, end);
+ break;
+ case DW_EH_PE_udata4:
+ *val += dw_read(cur, u32, end);
+ break;
+ case DW_EH_PE_sdata8:
+ *val += dw_read(cur, s64, end);
+ break;
+ case DW_EH_PE_udata8:
+ *val += dw_read(cur, u64, end);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ out:
+ *p = cur;
+ return 0;
+}
+
+#define dw_read_encoded_value(ptr, end, enc) ({ \
+ u64 __v; \
+ if (__dw_read_encoded_value(&ptr, end, &__v, enc)) { \
+ return -EINVAL; \
+ } \
+ __v; \
+ })
+
+static u64 elf_section_offset(int fd, const char *name)
+{
+ Elf *elf;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ u64 offset = 0;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ return 0;
+
+ do {
+ if (gelf_getehdr(elf, &ehdr) == NULL)
+ break;
+
+ if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL))
+ break;
+
+ offset = shdr.sh_offset;
+ } while (0);
+
+ elf_end(elf);
+ return offset;
+}
+
+struct table_entry {
+ u32 start_ip_offset;
+ u32 fde_offset;
+};
+
+struct eh_frame_hdr {
+ unsigned char version;
+ unsigned char eh_frame_ptr_enc;
+ unsigned char fde_count_enc;
+ unsigned char table_enc;
+
+ /*
+ * The rest of the header is variable-length and consists of the
+ * following members:
+ *
+ * encoded_t eh_frame_ptr;
+ * encoded_t fde_count;
+ */
+
+ /* A single encoded pointer should not be more than 8 bytes. */
+ u64 enc[2];
+
+ /*
+ * struct {
+ * encoded_t start_ip;
+ * encoded_t fde_addr;
+ * } binary_search_table[fde_count];
+ */
+ char data[0];
+} __packed;
+
+static int unwind_spec_ehframe(struct dso *dso, struct machine *machine,
+ u64 offset, u64 *table_data, u64 *segbase,
+ u64 *fde_count)
+{
+ struct eh_frame_hdr hdr;
+ u8 *enc = (u8 *) &hdr.enc;
+ u8 *end = (u8 *) &hdr.data;
+ ssize_t r;
+
+ r = dso__data_read_offset(dso, machine, offset,
+ (u8 *) &hdr, sizeof(hdr));
+ if (r != sizeof(hdr))
+ return -EINVAL;
+
+ /* We dont need eh_frame_ptr, just skip it. */
+ dw_read_encoded_value(enc, end, hdr.eh_frame_ptr_enc);
+
+ *fde_count = dw_read_encoded_value(enc, end, hdr.fde_count_enc);
+ *segbase = offset;
+ *table_data = (enc - (u8 *) &hdr) + offset;
+ return 0;
+}
+
+static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
+ u64 *table_data, u64 *segbase,
+ u64 *fde_count)
+{
+ int ret = -EINVAL, fd;
+ u64 offset;
+
+ fd = dso__data_fd(dso, machine);
+ if (fd < 0)
+ return -EINVAL;
+
+ /* Check the .eh_frame section for unwinding info */
+ offset = elf_section_offset(fd, ".eh_frame_hdr");
+ close(fd);
+
+ if (offset)
+ ret = unwind_spec_ehframe(dso, machine, offset,
+ table_data, segbase,
+ fde_count);
+
+ return ret;
+}
+
+#ifndef NO_LIBUNWIND_DEBUG_FRAME
+static int read_unwind_spec_debug_frame(struct dso *dso,
+ struct machine *machine, u64 *offset)
+{
+ int fd = dso__data_fd(dso, machine);
+
+ if (fd < 0)
+ return -EINVAL;
+
+ /* Check the .debug_frame section for unwinding info */
+ *offset = elf_section_offset(fd, ".debug_frame");
+ close(fd);
+
+ if (*offset)
+ return 0;
+
+ return -EINVAL;
+}
+#endif
+
+static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
+{
+ struct addr_location al;
+
+ thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
+ MAP__FUNCTION, ip, &al);
+ return al.map;
+}
+
+static int
+find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
+ int need_unwind_info, void *arg)
+{
+ struct unwind_info *ui = arg;
+ struct map *map;
+ unw_dyn_info_t di;
+ u64 table_data, segbase, fde_count;
+
+ map = find_map(ip, ui);
+ if (!map || !map->dso)
+ return -EINVAL;
+
+ pr_debug("unwind: find_proc_info dso %s\n", map->dso->name);
+
+ /* Check the .eh_frame section for unwinding info */
+ if (!read_unwind_spec_eh_frame(map->dso, ui->machine,
+ &table_data, &segbase, &fde_count)) {
+ memset(&di, 0, sizeof(di));
+ di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
+ di.start_ip = map->start;
+ di.end_ip = map->end;
+ di.u.rti.segbase = map->start + segbase;
+ di.u.rti.table_data = map->start + table_data;
+ di.u.rti.table_len = fde_count * sizeof(struct table_entry)
+ / sizeof(unw_word_t);
+ return dwarf_search_unwind_table(as, ip, &di, pi,
+ need_unwind_info, arg);
+ }
+
+#ifndef NO_LIBUNWIND_DEBUG_FRAME
+ /* Check the .debug_frame section for unwinding info */
+ if (!read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
+ memset(&di, 0, sizeof(di));
+ if (dwarf_find_debug_frame(0, &di, ip, 0, map->dso->name,
+ map->start, map->end))
+ return dwarf_search_unwind_table(as, ip, &di, pi,
+ need_unwind_info, arg);
+ }
+#endif
+
+ return -EINVAL;
+}
+
+static int access_fpreg(unw_addr_space_t __maybe_unused as,
+ unw_regnum_t __maybe_unused num,
+ unw_fpreg_t __maybe_unused *val,
+ int __maybe_unused __write,
+ void __maybe_unused *arg)
+{
+ pr_err("unwind: access_fpreg unsupported\n");
+ return -UNW_EINVAL;
+}
+
+static int get_dyn_info_list_addr(unw_addr_space_t __maybe_unused as,
+ unw_word_t __maybe_unused *dil_addr,
+ void __maybe_unused *arg)
+{
+ return -UNW_ENOINFO;
+}
+
+static int resume(unw_addr_space_t __maybe_unused as,
+ unw_cursor_t __maybe_unused *cu,
+ void __maybe_unused *arg)
+{
+ pr_err("unwind: resume unsupported\n");
+ return -UNW_EINVAL;
+}
+
+static int
+get_proc_name(unw_addr_space_t __maybe_unused as,
+ unw_word_t __maybe_unused addr,
+ char __maybe_unused *bufp, size_t __maybe_unused buf_len,
+ unw_word_t __maybe_unused *offp, void __maybe_unused *arg)
+{
+ pr_err("unwind: get_proc_name unsupported\n");
+ return -UNW_EINVAL;
+}
+
+static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
+ unw_word_t *data)
+{
+ struct addr_location al;
+ ssize_t size;
+
+ thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
+ MAP__FUNCTION, addr, &al);
+ if (!al.map) {
+ pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
+ return -1;
+ }
+
+ if (!al.map->dso)
+ return -1;
+
+ size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
+ addr, (u8 *) data, sizeof(*data));
+
+ return !(size == sizeof(*data));
+}
+
+static int reg_value(unw_word_t *valp, struct regs_dump *regs, int id)
+{
+ int i, idx = 0;
+ u64 mask = regs->mask;
+
+ if (!(mask & (1 << id)))
+ return -EINVAL;
+
+ for (i = 0; i < id; i++) {
+ if (mask & (1 << i))
+ idx++;
+ }
+
+ *valp = regs->regs[idx];
+ return 0;
+}
+
+static int access_mem(unw_addr_space_t __maybe_unused as,
+ unw_word_t addr, unw_word_t *valp,
+ int __write, void *arg)
+{
+ struct unwind_info *ui = arg;
+ struct stack_dump *stack = &ui->sample->user_stack;
+ unw_word_t start, end;
+ int offset;
+ int ret;
+
+ /* Don't support write, probably not needed. */
+ if (__write || !stack || !ui->sample->user_regs.regs) {
+ *valp = 0;
+ return 0;
+ }
+
+ ret = reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
+ if (ret)
+ return ret;
+
+ end = start + stack->size;
+
+ /* Check overflow. */
+ if (addr + sizeof(unw_word_t) < addr)
+ return -EINVAL;
+
+ if (addr < start || addr + sizeof(unw_word_t) >= end) {
+ ret = access_dso_mem(ui, addr, valp);
+ if (ret) {
+ pr_debug("unwind: access_mem %p not inside range %p-%p\n",
+ (void *)addr, (void *)start, (void *)end);
+ *valp = 0;
+ return ret;
+ }
+ return 0;
+ }
+
+ offset = addr - start;
+ *valp = *(unw_word_t *)&stack->data[offset];
+ pr_debug("unwind: access_mem addr %p, val %lx, offset %d\n",
+ (void *)addr, (unsigned long)*valp, offset);
+ return 0;
+}
+
+static int access_reg(unw_addr_space_t __maybe_unused as,
+ unw_regnum_t regnum, unw_word_t *valp,
+ int __write, void *arg)
+{
+ struct unwind_info *ui = arg;
+ int id, ret;
+
+ /* Don't support write, I suspect we don't need it. */
+ if (__write) {
+ pr_err("unwind: access_reg w %d\n", regnum);
+ return 0;
+ }
+
+ if (!ui->sample->user_regs.regs) {
+ *valp = 0;
+ return 0;
+ }
+
+ id = unwind__arch_reg_id(regnum);
+ if (id < 0)
+ return -EINVAL;
+
+ ret = reg_value(valp, &ui->sample->user_regs, id);
+ if (ret) {
+ pr_err("unwind: can't read reg %d\n", regnum);
+ return ret;
+ }
+
+ pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);
+ return 0;
+}
+
+static void put_unwind_info(unw_addr_space_t __maybe_unused as,
+ unw_proc_info_t *pi __maybe_unused,
+ void *arg __maybe_unused)
+{
+ pr_debug("unwind: put_unwind_info called\n");
+}
+
+static int entry(u64 ip, struct thread *thread, struct machine *machine,
+ unwind_entry_cb_t cb, void *arg)
+{
+ struct unwind_entry e;
+ struct addr_location al;
+
+ thread__find_addr_location(thread, machine,
+ PERF_RECORD_MISC_USER,
+ MAP__FUNCTION, ip, &al);
+
+ e.ip = ip;
+ e.map = al.map;
+ e.sym = al.sym;
+
+ pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
+ al.sym ? al.sym->name : "''",
+ ip,
+ al.map ? al.map->map_ip(al.map, ip) : (u64) 0);
+
+ return cb(&e, arg);
+}
+
+static void display_error(int err)
+{
+ switch (err) {
+ case UNW_EINVAL:
+ pr_err("unwind: Only supports local.\n");
+ break;
+ case UNW_EUNSPEC:
+ pr_err("unwind: Unspecified error.\n");
+ break;
+ case UNW_EBADREG:
+ pr_err("unwind: Register unavailable.\n");
+ break;
+ default:
+ break;
+ }
+}
+
+static unw_accessors_t accessors = {
+ .find_proc_info = find_proc_info,
+ .put_unwind_info = put_unwind_info,
+ .get_dyn_info_list_addr = get_dyn_info_list_addr,
+ .access_mem = access_mem,
+ .access_reg = access_reg,
+ .access_fpreg = access_fpreg,
+ .resume = resume,
+ .get_proc_name = get_proc_name,
+};
+
+static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
+ void *arg, int max_stack)
+{
+ unw_addr_space_t addr_space;
+ unw_cursor_t c;
+ int ret;
+
+ addr_space = unw_create_addr_space(&accessors, 0);
+ if (!addr_space) {
+ pr_err("unwind: Can't create unwind address space.\n");
+ return -ENOMEM;
+ }
+
+ ret = unw_init_remote(&c, addr_space, ui);
+ if (ret)
+ display_error(ret);
+
+ while (!ret && (unw_step(&c) > 0) && max_stack--) {
+ unw_word_t ip;
+
+ unw_get_reg(&c, UNW_REG_IP, &ip);
+ ret = ip ? entry(ip, ui->thread, ui->machine, cb, arg) : 0;
+ }
+
+ unw_destroy_addr_space(addr_space);
+ return ret;
+}
+
+int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
+ struct machine *machine, struct thread *thread,
+ struct perf_sample *data, int max_stack)
+{
+ unw_word_t ip;
+ struct unwind_info ui = {
+ .sample = data,
+ .thread = thread,
+ .machine = machine,
+ };
+ int ret;
+
+ if (!data->user_regs.regs)
+ return -EINVAL;
+
+ ret = reg_value(&ip, &data->user_regs, PERF_REG_IP);
+ if (ret)
+ return ret;
+
+ ret = entry(ip, thread, machine, cb, arg);
+ if (ret)
+ return -ENOMEM;
+
+ return --max_stack > 0 ? get_entries(&ui, cb, arg, max_stack) : 0;
+}
diff --git a/tools/perf/util/unwind.c b/tools/perf/util/unwind.c
deleted file mode 100644
index 720a4cae6004..000000000000
--- a/tools/perf/util/unwind.c
+++ /dev/null
@@ -1,595 +0,0 @@
-/*
- * Post mortem Dwarf CFI based unwinding on top of regs and stack dumps.
- *
- * Lots of this code have been borrowed or heavily inspired from parts of
- * the libunwind 0.99 code which are (amongst other contributors I may have
- * forgotten):
- *
- * Copyright (C) 2002-2007 Hewlett-Packard Co
- * Contributed by David Mosberger-Tang <davidm@....hp.com>
- *
- * And the bugs have been added by:
- *
- * Copyright (C) 2010, Frederic Weisbecker <fweisbec@...il.com>
- * Copyright (C) 2012, Jiri Olsa <jolsa@...hat.com>
- *
- */
-
-#include <elf.h>
-#include <gelf.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <linux/list.h>
-#include <libunwind.h>
-#include <libunwind-ptrace.h>
-#include "thread.h"
-#include "session.h"
-#include "perf_regs.h"
-#include "unwind.h"
-#include "symbol.h"
-#include "util.h"
-
-extern int
-UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
- unw_word_t ip,
- unw_dyn_info_t *di,
- unw_proc_info_t *pi,
- int need_unwind_info, void *arg);
-
-#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
-
-extern int
-UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
- unw_word_t ip,
- unw_word_t segbase,
- const char *obj_name, unw_word_t start,
- unw_word_t end);
-
-#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)
-
-#define DW_EH_PE_FORMAT_MASK 0x0f /* format of the encoded value */
-#define DW_EH_PE_APPL_MASK 0x70 /* how the value is to be applied */
-
-/* Pointer-encoding formats: */
-#define DW_EH_PE_omit 0xff
-#define DW_EH_PE_ptr 0x00 /* pointer-sized unsigned value */
-#define DW_EH_PE_udata4 0x03 /* unsigned 32-bit value */
-#define DW_EH_PE_udata8 0x04 /* unsigned 64-bit value */
-#define DW_EH_PE_sdata4 0x0b /* signed 32-bit value */
-#define DW_EH_PE_sdata8 0x0c /* signed 64-bit value */
-
-/* Pointer-encoding application: */
-#define DW_EH_PE_absptr 0x00 /* absolute value */
-#define DW_EH_PE_pcrel 0x10 /* rel. to addr. of encoded value */
-
-/*
- * The following are not documented by LSB v1.3, yet they are used by
- * GCC, presumably they aren't documented by LSB since they aren't
- * used on Linux:
- */
-#define DW_EH_PE_funcrel 0x40 /* start-of-procedure-relative */
-#define DW_EH_PE_aligned 0x50 /* aligned pointer */
-
-/* Flags intentionaly not handled, since they're not needed:
- * #define DW_EH_PE_indirect 0x80
- * #define DW_EH_PE_uleb128 0x01
- * #define DW_EH_PE_udata2 0x02
- * #define DW_EH_PE_sleb128 0x09
- * #define DW_EH_PE_sdata2 0x0a
- * #define DW_EH_PE_textrel 0x20
- * #define DW_EH_PE_datarel 0x30
- */
-
-struct unwind_info {
- struct perf_sample *sample;
- struct machine *machine;
- struct thread *thread;
-};
-
-#define dw_read(ptr, type, end) ({ \
- type *__p = (type *) ptr; \
- type __v; \
- if ((__p + 1) > (type *) end) \
- return -EINVAL; \
- __v = *__p++; \
- ptr = (typeof(ptr)) __p; \
- __v; \
- })
-
-static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val,
- u8 encoding)
-{
- u8 *cur = *p;
- *val = 0;
-
- switch (encoding) {
- case DW_EH_PE_omit:
- *val = 0;
- goto out;
- case DW_EH_PE_ptr:
- *val = dw_read(cur, unsigned long, end);
- goto out;
- default:
- break;
- }
-
- switch (encoding & DW_EH_PE_APPL_MASK) {
- case DW_EH_PE_absptr:
- break;
- case DW_EH_PE_pcrel:
- *val = (unsigned long) cur;
- break;
- default:
- return -EINVAL;
- }
-
- if ((encoding & 0x07) == 0x00)
- encoding |= DW_EH_PE_udata4;
-
- switch (encoding & DW_EH_PE_FORMAT_MASK) {
- case DW_EH_PE_sdata4:
- *val += dw_read(cur, s32, end);
- break;
- case DW_EH_PE_udata4:
- *val += dw_read(cur, u32, end);
- break;
- case DW_EH_PE_sdata8:
- *val += dw_read(cur, s64, end);
- break;
- case DW_EH_PE_udata8:
- *val += dw_read(cur, u64, end);
- break;
- default:
- return -EINVAL;
- }
-
- out:
- *p = cur;
- return 0;
-}
-
-#define dw_read_encoded_value(ptr, end, enc) ({ \
- u64 __v; \
- if (__dw_read_encoded_value(&ptr, end, &__v, enc)) { \
- return -EINVAL; \
- } \
- __v; \
- })
-
-static u64 elf_section_offset(int fd, const char *name)
-{
- Elf *elf;
- GElf_Ehdr ehdr;
- GElf_Shdr shdr;
- u64 offset = 0;
-
- elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
- if (elf == NULL)
- return 0;
-
- do {
- if (gelf_getehdr(elf, &ehdr) == NULL)
- break;
-
- if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL))
- break;
-
- offset = shdr.sh_offset;
- } while (0);
-
- elf_end(elf);
- return offset;
-}
-
-struct table_entry {
- u32 start_ip_offset;
- u32 fde_offset;
-};
-
-struct eh_frame_hdr {
- unsigned char version;
- unsigned char eh_frame_ptr_enc;
- unsigned char fde_count_enc;
- unsigned char table_enc;
-
- /*
- * The rest of the header is variable-length and consists of the
- * following members:
- *
- * encoded_t eh_frame_ptr;
- * encoded_t fde_count;
- */
-
- /* A single encoded pointer should not be more than 8 bytes. */
- u64 enc[2];
-
- /*
- * struct {
- * encoded_t start_ip;
- * encoded_t fde_addr;
- * } binary_search_table[fde_count];
- */
- char data[0];
-} __packed;
-
-static int unwind_spec_ehframe(struct dso *dso, struct machine *machine,
- u64 offset, u64 *table_data, u64 *segbase,
- u64 *fde_count)
-{
- struct eh_frame_hdr hdr;
- u8 *enc = (u8 *) &hdr.enc;
- u8 *end = (u8 *) &hdr.data;
- ssize_t r;
-
- r = dso__data_read_offset(dso, machine, offset,
- (u8 *) &hdr, sizeof(hdr));
- if (r != sizeof(hdr))
- return -EINVAL;
-
- /* We dont need eh_frame_ptr, just skip it. */
- dw_read_encoded_value(enc, end, hdr.eh_frame_ptr_enc);
-
- *fde_count = dw_read_encoded_value(enc, end, hdr.fde_count_enc);
- *segbase = offset;
- *table_data = (enc - (u8 *) &hdr) + offset;
- return 0;
-}
-
-static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
- u64 *table_data, u64 *segbase,
- u64 *fde_count)
-{
- int ret = -EINVAL, fd;
- u64 offset;
-
- fd = dso__data_fd(dso, machine);
- if (fd < 0)
- return -EINVAL;
-
- /* Check the .eh_frame section for unwinding info */
- offset = elf_section_offset(fd, ".eh_frame_hdr");
- close(fd);
-
- if (offset)
- ret = unwind_spec_ehframe(dso, machine, offset,
- table_data, segbase,
- fde_count);
-
- return ret;
-}
-
-#ifndef NO_LIBUNWIND_DEBUG_FRAME
-static int read_unwind_spec_debug_frame(struct dso *dso,
- struct machine *machine, u64 *offset)
-{
- int fd = dso__data_fd(dso, machine);
-
- if (fd < 0)
- return -EINVAL;
-
- /* Check the .debug_frame section for unwinding info */
- *offset = elf_section_offset(fd, ".debug_frame");
- close(fd);
-
- if (*offset)
- return 0;
-
- return -EINVAL;
-}
-#endif
-
-static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
-{
- struct addr_location al;
-
- thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
- MAP__FUNCTION, ip, &al);
- return al.map;
-}
-
-static int
-find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
- int need_unwind_info, void *arg)
-{
- struct unwind_info *ui = arg;
- struct map *map;
- unw_dyn_info_t di;
- u64 table_data, segbase, fde_count;
-
- map = find_map(ip, ui);
- if (!map || !map->dso)
- return -EINVAL;
-
- pr_debug("unwind: find_proc_info dso %s\n", map->dso->name);
-
- /* Check the .eh_frame section for unwinding info */
- if (!read_unwind_spec_eh_frame(map->dso, ui->machine,
- &table_data, &segbase, &fde_count)) {
- memset(&di, 0, sizeof(di));
- di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
- di.start_ip = map->start;
- di.end_ip = map->end;
- di.u.rti.segbase = map->start + segbase;
- di.u.rti.table_data = map->start + table_data;
- di.u.rti.table_len = fde_count * sizeof(struct table_entry)
- / sizeof(unw_word_t);
- return dwarf_search_unwind_table(as, ip, &di, pi,
- need_unwind_info, arg);
- }
-
-#ifndef NO_LIBUNWIND_DEBUG_FRAME
- /* Check the .debug_frame section for unwinding info */
- if (!read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
- memset(&di, 0, sizeof(di));
- if (dwarf_find_debug_frame(0, &di, ip, 0, map->dso->name,
- map->start, map->end))
- return dwarf_search_unwind_table(as, ip, &di, pi,
- need_unwind_info, arg);
- }
-#endif
-
- return -EINVAL;
-}
-
-static int access_fpreg(unw_addr_space_t __maybe_unused as,
- unw_regnum_t __maybe_unused num,
- unw_fpreg_t __maybe_unused *val,
- int __maybe_unused __write,
- void __maybe_unused *arg)
-{
- pr_err("unwind: access_fpreg unsupported\n");
- return -UNW_EINVAL;
-}
-
-static int get_dyn_info_list_addr(unw_addr_space_t __maybe_unused as,
- unw_word_t __maybe_unused *dil_addr,
- void __maybe_unused *arg)
-{
- return -UNW_ENOINFO;
-}
-
-static int resume(unw_addr_space_t __maybe_unused as,
- unw_cursor_t __maybe_unused *cu,
- void __maybe_unused *arg)
-{
- pr_err("unwind: resume unsupported\n");
- return -UNW_EINVAL;
-}
-
-static int
-get_proc_name(unw_addr_space_t __maybe_unused as,
- unw_word_t __maybe_unused addr,
- char __maybe_unused *bufp, size_t __maybe_unused buf_len,
- unw_word_t __maybe_unused *offp, void __maybe_unused *arg)
-{
- pr_err("unwind: get_proc_name unsupported\n");
- return -UNW_EINVAL;
-}
-
-static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
- unw_word_t *data)
-{
- struct addr_location al;
- ssize_t size;
-
- thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
- MAP__FUNCTION, addr, &al);
- if (!al.map) {
- pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
- return -1;
- }
-
- if (!al.map->dso)
- return -1;
-
- size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
- addr, (u8 *) data, sizeof(*data));
-
- return !(size == sizeof(*data));
-}
-
-static int reg_value(unw_word_t *valp, struct regs_dump *regs, int id)
-{
- int i, idx = 0;
- u64 mask = regs->mask;
-
- if (!(mask & (1 << id)))
- return -EINVAL;
-
- for (i = 0; i < id; i++) {
- if (mask & (1 << i))
- idx++;
- }
-
- *valp = regs->regs[idx];
- return 0;
-}
-
-static int access_mem(unw_addr_space_t __maybe_unused as,
- unw_word_t addr, unw_word_t *valp,
- int __write, void *arg)
-{
- struct unwind_info *ui = arg;
- struct stack_dump *stack = &ui->sample->user_stack;
- unw_word_t start, end;
- int offset;
- int ret;
-
- /* Don't support write, probably not needed. */
- if (__write || !stack || !ui->sample->user_regs.regs) {
- *valp = 0;
- return 0;
- }
-
- ret = reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
- if (ret)
- return ret;
-
- end = start + stack->size;
-
- /* Check overflow. */
- if (addr + sizeof(unw_word_t) < addr)
- return -EINVAL;
-
- if (addr < start || addr + sizeof(unw_word_t) >= end) {
- ret = access_dso_mem(ui, addr, valp);
- if (ret) {
- pr_debug("unwind: access_mem %p not inside range %p-%p\n",
- (void *)addr, (void *)start, (void *)end);
- *valp = 0;
- return ret;
- }
- return 0;
- }
-
- offset = addr - start;
- *valp = *(unw_word_t *)&stack->data[offset];
- pr_debug("unwind: access_mem addr %p, val %lx, offset %d\n",
- (void *)addr, (unsigned long)*valp, offset);
- return 0;
-}
-
-static int access_reg(unw_addr_space_t __maybe_unused as,
- unw_regnum_t regnum, unw_word_t *valp,
- int __write, void *arg)
-{
- struct unwind_info *ui = arg;
- int id, ret;
-
- /* Don't support write, I suspect we don't need it. */
- if (__write) {
- pr_err("unwind: access_reg w %d\n", regnum);
- return 0;
- }
-
- if (!ui->sample->user_regs.regs) {
- *valp = 0;
- return 0;
- }
-
- id = unwind__arch_reg_id(regnum);
- if (id < 0)
- return -EINVAL;
-
- ret = reg_value(valp, &ui->sample->user_regs, id);
- if (ret) {
- pr_err("unwind: can't read reg %d\n", regnum);
- return ret;
- }
-
- pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);
- return 0;
-}
-
-static void put_unwind_info(unw_addr_space_t __maybe_unused as,
- unw_proc_info_t *pi __maybe_unused,
- void *arg __maybe_unused)
-{
- pr_debug("unwind: put_unwind_info called\n");
-}
-
-static int entry(u64 ip, struct thread *thread, struct machine *machine,
- unwind_entry_cb_t cb, void *arg)
-{
- struct unwind_entry e;
- struct addr_location al;
-
- thread__find_addr_location(thread, machine,
- PERF_RECORD_MISC_USER,
- MAP__FUNCTION, ip, &al);
-
- e.ip = ip;
- e.map = al.map;
- e.sym = al.sym;
-
- pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
- al.sym ? al.sym->name : "''",
- ip,
- al.map ? al.map->map_ip(al.map, ip) : (u64) 0);
-
- return cb(&e, arg);
-}
-
-static void display_error(int err)
-{
- switch (err) {
- case UNW_EINVAL:
- pr_err("unwind: Only supports local.\n");
- break;
- case UNW_EUNSPEC:
- pr_err("unwind: Unspecified error.\n");
- break;
- case UNW_EBADREG:
- pr_err("unwind: Register unavailable.\n");
- break;
- default:
- break;
- }
-}
-
-static unw_accessors_t accessors = {
- .find_proc_info = find_proc_info,
- .put_unwind_info = put_unwind_info,
- .get_dyn_info_list_addr = get_dyn_info_list_addr,
- .access_mem = access_mem,
- .access_reg = access_reg,
- .access_fpreg = access_fpreg,
- .resume = resume,
- .get_proc_name = get_proc_name,
-};
-
-static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
- void *arg, int max_stack)
-{
- unw_addr_space_t addr_space;
- unw_cursor_t c;
- int ret;
-
- addr_space = unw_create_addr_space(&accessors, 0);
- if (!addr_space) {
- pr_err("unwind: Can't create unwind address space.\n");
- return -ENOMEM;
- }
-
- ret = unw_init_remote(&c, addr_space, ui);
- if (ret)
- display_error(ret);
-
- while (!ret && (unw_step(&c) > 0) && max_stack--) {
- unw_word_t ip;
-
- unw_get_reg(&c, UNW_REG_IP, &ip);
- ret = ip ? entry(ip, ui->thread, ui->machine, cb, arg) : 0;
- }
-
- unw_destroy_addr_space(addr_space);
- return ret;
-}
-
-int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
- struct machine *machine, struct thread *thread,
- struct perf_sample *data, int max_stack)
-{
- unw_word_t ip;
- struct unwind_info ui = {
- .sample = data,
- .thread = thread,
- .machine = machine,
- };
- int ret;
-
- if (!data->user_regs.regs)
- return -EINVAL;
-
- ret = reg_value(&ip, &data->user_regs, PERF_REG_IP);
- if (ret)
- return ret;
-
- ret = entry(ip, thread, machine, cb, arg);
- if (ret)
- return -ENOMEM;
-
- return --max_stack > 0 ? get_entries(&ui, cb, arg, max_stack) : 0;
-}
--
1.8.1.4
--
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