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um: Add generic stub_syscall6 function

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This function will be used by the new syscall handling code.

Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>
Link: https://patch.msgid.link/20240703134536.1161108-4-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Berg 2024-07-03 15:45:27 +02:00 committed by Johannes Berg
parent dc26184a9d
commit 542dc79f6e
2 changed files with 38 additions and 0 deletions
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22
arch/x86/um/shared/sysdep/stub_32.h
View File

@ -80,6 +80,28 @@ static __always_inline long stub_syscall5(long syscall, long arg1, long arg2,
return ret;
}
static __always_inline long stub_syscall6(long syscall, long arg1, long arg2,
long arg3, long arg4, long arg5,
long arg6)
{
struct syscall_args {
int ebx, ebp;
} args = { arg1, arg6 };
long ret;
__asm__ volatile ("pushl %%ebp;"
"movl 0x4(%%ebx),%%ebp;"
"movl (%%ebx),%%ebx;"
"int $0x80;"
"popl %%ebp"
: "=a" (ret)
: "0" (syscall), "b" (&args),
"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
: "memory");
return ret;
}
static __always_inline void trap_myself(void)
{
__asm("int3");

16
arch/x86/um/shared/sysdep/stub_64.h
View File

@ -80,6 +80,22 @@ static __always_inline long stub_syscall5(long syscall, long arg1, long arg2,
return ret;
}
static __always_inline long stub_syscall6(long syscall, long arg1, long arg2,
long arg3, long arg4, long arg5,
long arg6)
{
long ret;
__asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; movq %7,%%r9 ; "
__syscall
: "=a" (ret)
: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
"g" (arg4), "g" (arg5), "g" (arg6)
: __syscall_clobber, "r10", "r8", "r9");
return ret;
}
static __always_inline void trap_myself(void)
{
__asm("int3");