diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.h | 65 |
1 files changed, 50 insertions, 15 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h index 180f334240..7f6fcf3288 100644 --- a/sysdeps/unix/sysv/linux/i386/sysdep.h +++ b/sysdeps/unix/sysv/linux/i386/sysdep.h @@ -304,6 +304,17 @@ asm (".L__X'%ebx = 1\n\t" ".endif\n\t" ".endm\n\t"); +/* Six-argument syscalls use an out-of-line helper, because an inline + asm using all registers apart from %esp cannot work reliably and + the assembler does not support describing an asm that saves and + restores %ebp itself as a separate stack frame. This structure + stores the arguments not passed in registers; %edi is passed with a + pointer to this structure. */ +struct libc_do_syscall_args +{ + int ebx, edi, ebp; +}; + /* Define a macro which expands inline into the wrapper code for a system call. */ #undef INLINE_SYSCALL @@ -325,11 +336,42 @@ asm (".L__X'%ebx = 1\n\t" The _NCS variant allows non-constant syscall numbers but it is not possible to use more than four parameters. */ #undef INTERNAL_SYSCALL -#ifdef I386_USE_SYSENTER -# ifdef SHARED -# define INTERNAL_SYSCALL(name, err, nr, args...) \ +#define INTERNAL_SYSCALL_MAIN_0(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 0, args) +#define INTERNAL_SYSCALL_MAIN_1(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 1, args) +#define INTERNAL_SYSCALL_MAIN_2(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 2, args) +#define INTERNAL_SYSCALL_MAIN_3(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 3, args) +#define INTERNAL_SYSCALL_MAIN_4(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 4, args) +#define INTERNAL_SYSCALL_MAIN_5(name, err, args...) \ + INTERNAL_SYSCALL_MAIN_INLINE(name, err, 5, args) +/* Each object using 6-argument inline syscalls must include a + definition of __libc_do_syscall. */ +#define INTERNAL_SYSCALL_MAIN_6(name, err, arg1, arg2, arg3, \ + arg4, arg5, arg6) \ + struct libc_do_syscall_args _xv = \ + { \ + (int) (arg1), \ + (int) (arg5), \ + (int) (arg6) \ + }; \ + asm volatile ( \ + "movl %1, %%eax\n\t" \ + "call __libc_do_syscall" \ + : "=a" (resultvar) \ + : "i" (__NR_##name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \ + : "memory", "cc") +#define INTERNAL_SYSCALL(name, err, nr, args...) \ ({ \ register unsigned int resultvar; \ + INTERNAL_SYSCALL_MAIN_##nr (name, err, args); \ + (int) resultvar; }) +#ifdef I386_USE_SYSENTER +# ifdef SHARED +# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ EXTRAVAR_##nr \ asm volatile ( \ LOADARGS_##nr \ @@ -338,8 +380,7 @@ asm (".L__X'%ebx = 1\n\t" RESTOREARGS_##nr \ : "=a" (resultvar) \ : "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \ - ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) + ASMFMT_##nr(args) : "memory", "cc") # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ register unsigned int resultvar; \ @@ -353,9 +394,7 @@ asm (".L__X'%ebx = 1\n\t" ASMFMT_##nr(args) : "memory", "cc"); \ (int) resultvar; }) # else -# define INTERNAL_SYSCALL(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ +# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ EXTRAVAR_##nr \ asm volatile ( \ LOADARGS_##nr \ @@ -363,8 +402,7 @@ asm (".L__X'%ebx = 1\n\t" "call *_dl_sysinfo\n\t" \ RESTOREARGS_##nr \ : "=a" (resultvar) \ - : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) + : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc") # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ register unsigned int resultvar; \ @@ -378,9 +416,7 @@ asm (".L__X'%ebx = 1\n\t" (int) resultvar; }) # endif #else -# define INTERNAL_SYSCALL(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ +# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ EXTRAVAR_##nr \ asm volatile ( \ LOADARGS_##nr \ @@ -388,8 +424,7 @@ asm (".L__X'%ebx = 1\n\t" "int $0x80\n\t" \ RESTOREARGS_##nr \ : "=a" (resultvar) \ - : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) + : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc") # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ register unsigned int resultvar; \ |