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Message-ID: <20240319104418.284519-2-ubizjak@gmail.com>
Date: Tue, 19 Mar 2024 11:40:12 +0100
From: Uros Bizjak <ubizjak@...il.com>
To: x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
Andy Lutomirski <luto@...nel.org>,
Brian Gerst <brgerst@...il.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH -tip 1/3] x86/asm: Remove %P operand modifier from altinstr asm templates
The "P" asm operand modifier is a x86 target-specific modifier.
For x86_64, when used with a symbol reference, the "%P" modifier
emits "sym" instead of "sym(%rip)". This property is currently
used to prevent %RIP-relative addressing in .altinstr sections.
%RIP-relative addresses are nowadays correctly handled in .altinstr
sections, so remove %P operand modifier from altinstr asm templates.
Also note that unlike GCC, clang emits %rip-relative symbol
reference with "P" asm operand modifier, so the patch also unifies
symbol handling with both compilers.
No functional changes intended.
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
---
arch/x86/include/asm/apic.h | 2 +-
arch/x86/include/asm/processor.h | 6 +++---
arch/x86/include/asm/special_insns.h | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 94ce0f7c9d3a..fa2e4244654e 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -91,7 +91,7 @@ static inline void native_apic_mem_write(u32 reg, u32 v)
{
volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
- alternative_io("movl %0, %P1", "xchgl %0, %P1", X86_BUG_11AP,
+ alternative_io("movl %0, %1", "xchgl %0, %1", X86_BUG_11AP,
ASM_OUTPUT2("=r" (v), "=m" (*addr)),
ASM_OUTPUT2("0" (v), "m" (*addr)));
}
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 811548f131f4..438c0c8f596a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -587,7 +587,7 @@ extern char ignore_fpu_irq;
# define BASE_PREFETCH ""
# define ARCH_HAS_PREFETCH
#else
-# define BASE_PREFETCH "prefetcht0 %P1"
+# define BASE_PREFETCH "prefetcht0 %1"
#endif
/*
@@ -598,7 +598,7 @@ extern char ignore_fpu_irq;
*/
static inline void prefetch(const void *x)
{
- alternative_input(BASE_PREFETCH, "prefetchnta %P1",
+ alternative_input(BASE_PREFETCH, "prefetchnta %1",
X86_FEATURE_XMM,
"m" (*(const char *)x));
}
@@ -610,7 +610,7 @@ static inline void prefetch(const void *x)
*/
static __always_inline void prefetchw(const void *x)
{
- alternative_input(BASE_PREFETCH, "prefetchw %P1",
+ alternative_input(BASE_PREFETCH, "prefetchw %1",
X86_FEATURE_3DNOWPREFETCH,
"m" (*(const char *)x));
}
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 2e9fc5c400cd..0ee2ba589492 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -182,8 +182,8 @@ static __always_inline void clflush(volatile void *__p)
static inline void clflushopt(volatile void *__p)
{
- alternative_io(".byte 0x3e; clflush %P0",
- ".byte 0x66; clflush %P0",
+ alternative_io(".byte 0x3e; clflush %0",
+ ".byte 0x66; clflush %0",
X86_FEATURE_CLFLUSHOPT,
"+m" (*(volatile char __force *)__p));
}
--
2.44.0
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