diff options
Diffstat (limited to 'libc/sysdeps/linux/arm/bits/syscalls.h')
| -rw-r--r-- | libc/sysdeps/linux/arm/bits/syscalls.h | 70 |
1 files changed, 64 insertions, 6 deletions
diff --git a/libc/sysdeps/linux/arm/bits/syscalls.h b/libc/sysdeps/linux/arm/bits/syscalls.h index 21e5b8146..d25d1824e 100644 --- a/libc/sysdeps/linux/arm/bits/syscalls.h +++ b/libc/sysdeps/linux/arm/bits/syscalls.h @@ -21,7 +21,22 @@ glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h */ -#ifndef __ASSEMBLER__ +#ifdef __ASSEMBLER__ +/* Call a given syscall, with arguments loaded. For EABI, we must + save and restore r7 for the syscall number. Unlike the DO_CALL + macro in glibc, this macro does not load syscall arguments. */ +#undef DO_CALL +#if defined(__ARM_EABI__) +#define DO_CALL(syscall_name) \ + mov ip, r7; \ + ldr r7, =SYS_ify (syscall_name); \ + swi 0x0; \ + mov r7, ip; +#else +#define DO_CALL(syscall_name) \ + swi SYS_ify (syscall_name); +#endif +#else #undef _syscall0 #define _syscall0(type,name) \ @@ -85,18 +100,33 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7) #undef INLINE_SYSCALL #define INLINE_SYSCALL(name, nr, args...) \ - ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \ - if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0)) \ + ({ unsigned int __sys_result = INTERNAL_SYSCALL (name, , nr, args); \ + if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (__sys_result, ), 0)) \ { \ - __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \ - _sys_result = (unsigned int) -1; \ + __set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \ + __sys_result = (unsigned int) -1; \ } \ - (int) _sys_result; }) + (int) __sys_result; }) #undef INTERNAL_SYSCALL_DECL #define INTERNAL_SYSCALL_DECL(err) do { } while (0) #undef INTERNAL_SYSCALL +#if defined(__ARM_EABI__) +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + ({unsigned int _sys_result; \ + { \ + register int _a1 asm ("r0"), _nr asm ("r7"); \ + LOAD_ARGS_##nr (args) \ + _nr = SYS_ify(name); \ + asm volatile ("swi 0x0 @ syscall " #name \ + : "=r" (_a1) \ + : "r" (_nr) ASM_ARGS_##nr \ + : "memory"); \ + _sys_result = _a1; \ + } \ + (int) _sys_result; }) +#else /* !defined(__ARM_EABI__) */ #if !defined(__thumb__) #define INTERNAL_SYSCALL(name, err, nr, args...) \ ({ unsigned int _sys_result; \ @@ -111,6 +141,11 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7) } \ (int) _sys_result; }) #else +#if 0 +/* This doesn't work because GCC uses r7 as a frame pointer in + * some cases and doesn't notice that the _r7 value changes + * it, resulting in mysterious crashes after the SWI. + */ #define INTERNAL_SYSCALL(name, err, nr, args...) \ ({ unsigned int _sys_result; \ { \ @@ -124,7 +159,30 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7) _sys_result = _a1; \ } \ (int) _sys_result; }) +#else +/* So hide the use of r7 from the compiler, this would be a lot + * easier but for the fact that the syscalls can exceed 255. + * For the moment the LOAD_ARG_7 is sacrificed. + */ +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + ({ unsigned int _sys_result; \ + { \ + register int _a1 asm ("a1"); \ + LOAD_ARGS_##nr (args) \ + register int _v3 asm ("v3") = (int) (SYS_ify(name)); \ + asm volatile ("push {r7}\n" \ + "\tmov r7, v3\n" \ + "\tswi 0 @ syscall " #name "\n" \ + "\tpop {r7}" \ + : "=r" (_a1) \ + : "r" (_v3) ASM_ARGS_##nr \ + : "memory"); \ + _sys_result = _a1; \ + } \ + (int) _sys_result; }) +#endif #endif +#endif /* !defined(__ARM_EABI__) */ #undef INTERNAL_SYSCALL_ERROR_P #define INTERNAL_SYSCALL_ERROR_P(val, err) \ |