Well, I agree with your previous email. Now since we no longer use a #pragma
optimize with -fomit-frame-pointer, the function is not needed. I propose the
following macro (this is not so much different with other my_syscall macro),
expect the 6th argument can be in reg or mem.
The "rm" constraint here gives the opportunity for the compiler to use %ebp
instead of memory if -fomit-frame-pointer is turned on.
#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
({ \
long _ret; \
register long _num asm("eax") = (num); \
register long _arg1 asm("ebx") = (long)(arg1); \
register long _arg2 asm("ecx") = (long)(arg2); \
register long _arg3 asm("edx") = (long)(arg3); \
register long _arg4 asm("esi") = (long)(arg4); \
register long _arg5 asm("edi") = (long)(arg5); \
long _arg6 = (long)(arg6); /* Might be in memory */ \
\
asm volatile ( \
"pushl %[_arg6]\n\t" \
"pushl %%ebp\n\t" \
"movl 4(%%esp), %%ebp\n\t" \
"int $0x80\n\t" \
"popl %%ebp\n\t" \
"addl $4,%%esp\n\t" \
: "=a"(_ret) \
: "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), \
"r"(_arg4),"r"(_arg5), [_arg6]"rm"(_arg6) \
: "memory", "cc" \
); \
_ret; \
})
What do you think?