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um: Mark 32bit syscall helpers as clobbering memory

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The 64bit helper are marked to clobber the memory, but the 32bit ones
are not. Add the appropriate clobber to the 32bit helper routines so
that the compiler cannot do invalid optimizations.

Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Benjamin Berg 2023-11-10 12:03:48 +01:00 committed by Richard Weinberger
parent 1e41c415e2
commit 83aec96c63
1 changed files with 12 additions and 6 deletions
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18
arch/x86/um/shared/sysdep/stub_32.h
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@ -16,7 +16,8 @@ static __always_inline long stub_syscall0(long syscall)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)
: "memory");
return ret;
}
@ -25,7 +26,8 @@ static __always_inline long stub_syscall1(long syscall, long arg1)
{
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)
: "memory");
return ret;
}
@ -35,7 +37,8 @@ static __always_inline long stub_syscall2(long syscall, long arg1, long arg2)
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2));
"c" (arg2)
: "memory");
return ret;
}
@ -46,7 +49,8 @@ static __always_inline long stub_syscall3(long syscall, long arg1, long arg2,
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3));
"c" (arg2), "d" (arg3)
: "memory");
return ret;
}
@ -57,7 +61,8 @@ static __always_inline long stub_syscall4(long syscall, long arg1, long arg2,
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3), "S" (arg4));
"c" (arg2), "d" (arg3), "S" (arg4)
: "memory");
return ret;
}
@ -68,7 +73,8 @@ static __always_inline long stub_syscall5(long syscall, long arg1, long arg2,
long ret;
__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
: "memory");
return ret;
}