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1998-10-22 12:49  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/i386/sysdep.h: Drastically simplify and
	improve INLINE_SYSCALL using macro assembler magic.
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Ulrich Drepper 1998-10-22 12:49:46 +00:00
parent 9271a050b5
commit 78e5779b1e
3 changed files with 52 additions and 53 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
1998-10-22 12:49 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/i386/sysdep.h: Drastically simplify and
improve INLINE_SYSCALL using macro assembler magic.
1998-10-22 H.J. Lu <hjl@gnu.org>
* sysdeps/unix/sysv/linux/i386/getgroups.c (__getgroups): Add

2
sysdeps/unix/sysv/linux/i386/setgroups.c
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@ -41,7 +41,7 @@ setgroups (n, groups)
__set_errno (EINVAL);
return -1;
}
else if
else
{
size_t i;
__kernel_gid_t kernel_groups[n];

98
sysdeps/unix/sysv/linux/i386/sysdep.h
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@ -200,6 +200,42 @@
#else /* !__ASSEMBLER__ */
/* We need some help from the assembler to generate optimal code. We
define some macros here which later will be used. */
asm ("__X'%ebx = 1\n\t"
"__X'%ecx = 2\n\t"
"__X'%edx = 2\n\t"
"__X'%eax = 3\n\t"
"__X'%esi = 3\n\t"
"__X'%edi = 3\n\t"
"__X'%ebp = 3\n\t"
"__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");
/* Define a macro which expands inline into the wrapper code for a system
call. */
#undef INLINE_SYSCALL
@ -207,13 +243,13 @@
({ \
unsigned int resultvar; \
asm volatile ( \
PUSHARGS_##nr \
DOARGS_##nr \
"bpushl __X'%k2, %k2\n\t" \
"bmovl __X'%k2, %k2\n\t" \
"movl %1, %%eax\n\t" \
"int $0x80\n\t" \
POPARGS_##nr \
"bpopl __X'%k2, %k2\n\t" \
: "=a" (resultvar) \
: ASMFMT_##nr(args) \
"i" (__NR_##name) : "memory", "cc"); \
: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
if (resultvar >= 0xfffff001) \
{ \
__set_errno (-resultvar); \
@ -221,59 +257,17 @@
} \
(int) resultvar; })
#define PUSHARGS_0 /* Nothing */
#define DOARGS_0 "movl %1, %%eax\n\t"
#define POPARGS_0 /* Nothing */
#define _PUSHARGS_0 /* Nothing */
#define _DOARGS_0 /* Nothing */
#define _POPARGS_0 /* Nothing */
#define ASMFMT_0()
#define PUSHARGS_1 "xchgl %%ebx, %%edx\n\t" _PUSHARGS_0
#define DOARGS_1 _DOARGS_0 "movl %2, %%eax\n\t"
#define POPARGS_1 _POPARGS_0 "xchgl %%edx, %%ebx"
#define _PUSHARGS_1 _PUSHARGS_0 "pushl %%ebx\n\t"
#define _DOARGS_1 "movl %1, %%ebx\n\t" _DOARGS_0
#define _POPARGS_1 "popl %%ebx\n\t" _POPARGS_0
#define ASMFMT_1(arg1) \
"d" (arg1),
#define PUSHARGS_2 PUSHARGS_1
#define DOARGS_2 _DOARGS_0 "movl %3, %%eax\n\t"
#define POPARGS_2 POPARGS_1
#define _PUSHARGS_2 _PUSHARGS_1
#define _DOARGS_2 _DOARGS_1
#define _POPARGS_2 _POPARGS_1
, "acdSD" (arg1)
#define ASMFMT_2(arg1, arg2) \
"d" (arg1), "c" (arg2),
#define PUSHARGS_3 _PUSHARGS_3
#define DOARGS_3 _DOARGS_3 "movl %4, %%eax\n\t"
#define POPARGS_3 _POPARGS_3
#define _PUSHARGS_3 _PUSHARGS_2
#define _DOARGS_3 _DOARGS_2
#define _POPARGS_3 _POPARGS_2
, "adCD" (arg1), "c" (arg2)
#define ASMFMT_3(arg1, arg2, arg3) \
"0" (arg1), "c" (arg2), "d" (arg3),
#define PUSHARGS_4 _PUSHARGS_4
#define DOARGS_4 _DOARGS_4 "movl %5, %%eax\n\t"
#define POPARGS_4 _POPARGS_4
#define _PUSHARGS_4 _PUSHARGS_3
#define _DOARGS_4 _DOARGS_3
#define _POPARGS_4 _POPARGS_3
, "aCD" (arg1), "c" (arg2), "d" (arg3)
#define ASMFMT_4(arg1, arg2, arg3, arg4) \
"0" (arg1), "c" (arg2), "d" (arg3), "S" (arg4),
#define PUSHARGS_5 _PUSHARGS_5
#define DOARGS_5 _DOARGS_5 "movl %6, %%eax\n\t"
#define POPARGS_5 _POPARGS_5
#define _PUSHARGS_5 PUSHARGS_4
#define _DOARGS_5 _DOARGS_4
#define _POPARGS_5 _POPARGS_4
, "aD" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)
#define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \
"0" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5),
, "a" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
#endif /* __ASSEMBLER__ */