diff options
Diffstat (limited to 'libc/sysdeps/linux/i386/bits')
| -rw-r--r-- | libc/sysdeps/linux/i386/bits/syscalls.h | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/libc/sysdeps/linux/i386/bits/syscalls.h b/libc/sysdeps/linux/i386/bits/syscalls.h index d612071b4..eb77ea8d0 100644 --- a/libc/sysdeps/linux/i386/bits/syscalls.h +++ b/libc/sysdeps/linux/i386/bits/syscalls.h @@ -15,6 +15,13 @@ #define SYS_ify(syscall_name) (__NR_##syscall_name) +#define INTERNAL_SYSCALL_DECL(err) do { } while (0) + +#define INTERNAL_SYSCALL_ERROR_P(val, err) \ + ((unsigned int) (val) >= 0xfffff001u) + +#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) + /* We need some help from the assembler to generate optimal code. We define some macros here which later will be used. */ @@ -145,24 +152,29 @@ type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6) \ { \ return (type) (INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6)); \ } - #define INLINE_SYSCALL(name, nr, args...) \ - ({ \ - unsigned int resultvar; \ - __asm__ __volatile__ ( \ - LOADARGS_##nr \ - "movl %1, %%eax\n\t" \ - "int $0x80\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \ - if (resultvar >= 0xfffff001) \ - { \ - __set_errno (-resultvar); \ - resultvar = 0xffffffff; \ - } \ + ({ \ + unsigned int result = INTERNAL_SYSCALL (name, , nr, args); \ + if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, ), 0)) \ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (result, )); \ + result = 0xffffffff; \ + } \ + (int) result; }) + +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + ({ \ + unsigned int resultvar; \ + __asm__ __volatile__ ( \ + LOADARGS_##nr \ + "movl %1, %%eax\n\t" \ + "int $0x80\n\t" \ + RESTOREARGS_##nr \ + : "=a" (resultvar) \ + : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \ (int) resultvar; }) + #define LOADARGS_0 #define LOADARGS_1 \ "bpushl .L__X'%k2, %k2\n\t" \ |