uclibc-ng/libc/sysdeps/linux/i386/bits/syscalls.h

#ifndef _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H
#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif

/*
   Some of the sneaky macros in the code were taken from
   glibc-2.2.5/sysdeps/unix/sysv/linux/i386/sysdep.h
*/

#ifndef __ASSEMBLER__

#include <errno.h>

/* We need some help from the assembler to generate optimal code.  We
   define some macros here which later will be used.  */

#if defined  __SUPPORT_LD_DEBUG__ && defined __DOMULTI__
#error LD debugging and DOMULTI are incompatible
#endif

#ifdef __DOMULTI__
__asm__ (".L__X'%ebx = 1\n\t"
     ".L__X'%ecx = 2\n\t"
     ".L__X'%edx = 2\n\t"
     ".L__X'%eax = 3\n\t"
     ".L__X'%esi = 3\n\t"
     ".L__X'%edi = 3\n\t"
     ".L__X'%ebp = 3\n\t"
     ".L__X'%esp = 3\n\t"
     ".ifndef _BITS_SYSCALLS_ASM\n\t"
     ".set _BITS_SYSCALLS_ASM,1\n\t"
     ".macro bpushl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "pushl %ebx\n\t"
     ".else\n\t"
     "xchgl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t"
     ".macro bpopl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "popl %ebx\n\t"
     ".else\n\t"
     "xchgl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t"
     ".macro bmovl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "movl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t"
     ".endif\n\t");
#else
__asm__ (".L__X'%ebx = 1\n\t"
     ".L__X'%ecx = 2\n\t"
     ".L__X'%edx = 2\n\t"
     ".L__X'%eax = 3\n\t"
     ".L__X'%esi = 3\n\t"
     ".L__X'%edi = 3\n\t"
     ".L__X'%ebp = 3\n\t"
     ".L__X'%esp = 3\n\t"
     ".macro bpushl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "pushl %ebx\n\t"
     ".else\n\t"
     "xchgl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t"
     ".macro bpopl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "popl %ebx\n\t"
     ".else\n\t"
     "xchgl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t"
     ".macro bmovl name reg\n\t"
     ".if 1 - \\name\n\t"
     ".if 2 - \\name\n\t"
     "movl \\reg, %ebx\n\t"
     ".endif\n\t"
     ".endif\n\t"
     ".endm\n\t");
#endif

#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
  ({                                                                          \
    register unsigned int resultvar;                                          \
    __asm__ __volatile__ (                                                    \
    LOADARGS_##nr                                                             \
    "movl %1, %%eax\n\t"                                                      \
    "int $0x80\n\t"                                                           \
    RESTOREARGS_##nr                                                          \
    : "=a" (resultvar)                                                        \
    : "g" (name) ASMFMT_##nr(args) : "memory", "cc");                         \
     (int) resultvar; })

#define LOADARGS_0
#define LOADARGS_1 \
    "bpushl .L__X'%k2, %k2\n\t"						      \
    "bmovl .L__X'%k2, %k2\n\t"
#define LOADARGS_2	LOADARGS_1
#define LOADARGS_3	LOADARGS_1
#define LOADARGS_4	LOADARGS_1
#define LOADARGS_5	LOADARGS_1
#define LOADARGS_6	LOADARGS_1 "push %%ebp ; movl %7, %%ebp\n\t"

#define RESTOREARGS_0
#define RESTOREARGS_1 \
    "bpopl .L__X'%k2, %k2\n\t"
#define RESTOREARGS_2	RESTOREARGS_1
#define RESTOREARGS_3	RESTOREARGS_1
#define RESTOREARGS_4	RESTOREARGS_1
#define RESTOREARGS_5	RESTOREARGS_1
#define RESTOREARGS_6	"pop %%ebp\n\t" RESTOREARGS_1

#define ASMFMT_0()
#define ASMFMT_1(arg1) \
	, "acdSD" (arg1)
#define ASMFMT_2(arg1, arg2) \
	, "adSD" (arg1), "c" (arg2)
#define ASMFMT_3(arg1, arg2, arg3) \
	, "aSD" (arg1), "c" (arg2), "d" (arg3)
#define ASMFMT_4(arg1, arg2, arg3, arg4) \
	, "aD" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)
#define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \
	, "a" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
#define ASMFMT_6(arg1, arg2, arg3, arg4, arg5, arg6) \
	, "a" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5), "m" (arg6)

#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */