Commit 542dc79f authored by Benjamin Berg's avatar Benjamin Berg Committed by Johannes Berg
Browse files

um: Add generic stub_syscall6 function 



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

Signed-off-by: default avatarBenjamin Berg <benjamin@sipsolutions.net>
Link: https://patch.msgid.link/20240703134536.1161108-4-benjamin@sipsolutions.net


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent dc26184a

arch/x86/um/shared/sysdep/stub_32.h

+22 −0
Original line number Diff line number Diff line
@@ -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");

arch/x86/um/shared/sysdep/stub_64.h

+16 −0
Original line number Diff line number Diff line
@@ -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");