summaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-21 13:06:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-21 13:06:00 -0700
commite990c77d06dbacc8e5c5edd2c4a1005d318a4fa6 (patch)
treeda0e56801bc28204ad3e51652d8e0393d7170060 /arch
parent2f0384e5fc4766ad909597547d0e2b716c036755 (diff)
parentd7acb92fea932ad2e7846480aeacddc2c03c8485 (diff)
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86-64, asm: If the assembler supports fxsave64, use it i386: Make kernel_execve() suitable for stack unwinding
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Makefile8
-rw-r--r--arch/x86/include/asm/i387.h2
-rw-r--r--arch/x86/kernel/sys_i386_32.c4
3 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index e8c8881351b..b02e509072a 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -96,8 +96,12 @@ cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_en
# is .cfi_signal_frame supported too?
cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
-KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
-KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
+
+# does binutils support specific instructions?
+asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
+
+KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
+KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
LDFLAGS := -m elf_$(UTS_MACHINE)
diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index a73a8d5a5e6..70f105b352e 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -175,7 +175,7 @@ static inline void fpu_fxsave(struct fpu *fpu)
uses any extended registers for addressing, a second REX prefix
will be generated (to the assembler, rex64 followed by semicolon
is a separate instruction), and hence the 64-bitness is lost. */
-#if 0
+#ifdef CONFIG_AS_FXSAVEQ
/* Using "fxsaveq %0" would be the ideal choice, but is only supported
starting with gas 2.16. */
__asm__ __volatile__("fxsaveq %0"
diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
index d5e06624e34..0b0cb5fede1 100644
--- a/arch/x86/kernel/sys_i386_32.c
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -33,8 +33,8 @@ int kernel_execve(const char *filename,
const char *const envp[])
{
long __res;
- asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
+ asm volatile ("int $0x80"
: "=a" (__res)
- : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
+ : "0" (__NR_execve), "b" (filename), "c" (argv), "d" (envp) : "memory");
return __res;
}