#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-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h */ #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 #include <errno.h> #define INLINE_SYSCALL_NCS(name, nr, args...) \ ({ unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args); \ if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, ), 0)) \ { \ __set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, )); \ _inline_sys_result = (unsigned int) -1; \ } \ (int) _inline_sys_result; }) #if !defined(__thumb__) #if defined(__ARM_EABI__) #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({unsigned int __sys_result; \ { \ register int _a1 __asm__ ("r0"), _nr __asm__ ("r7"); \ LOAD_ARGS_##nr (args) \ _nr = (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__) */ #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ unsigned int __sys_result; \ { \ register int _a1 __asm__ ("a1"); \ LOAD_ARGS_##nr (args) \ __asm__ __volatile__ ("swi %1 @ syscall " #name \ : "=r" (_a1) \ : "i" (name) ASM_ARGS_##nr \ : "memory"); \ __sys_result = _a1; \ } \ (int) __sys_result; }) #endif #else /* !defined(__thumb__) */ /* We can't use push/pop inside the asm because that breaks unwinding (ie. thread cancellation). */ #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ unsigned int __sys_result; \ { \ int _sys_buf[2]; \ register int _a1 __asm__ ("a1"); \ register int *_v3 __asm__ ("v3") = _sys_buf; \ *_v3 = (int) (name); \ LOAD_ARGS_##nr (args) \ __asm__ __volatile__ ("str r7, [v3, #4]\n" \ "\tldr r7, [v3]\n" \ "\tswi 0 @ syscall " #name "\n" \ "\tldr r7, [v3, #4]" \ : "=r" (_a1) \ : "r" (_v3) ASM_ARGS_##nr \ : "memory"); \ __sys_result = _a1; \ } \ (int) __sys_result; }) #endif /*!defined(__thumb__)*/ #define INTERNAL_SYSCALL_ERROR_P(val, err) \ ((unsigned int) (val) >= 0xfffff001u) #define LOAD_ARGS_0() #define ASM_ARGS_0 #define LOAD_ARGS_1(a1) \ int _a1tmp = (int) (a1); \ LOAD_ARGS_0 () \ _a1 = _a1tmp; #define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1) #define LOAD_ARGS_2(a1, a2) \ int _a2tmp = (int) (a2); \ LOAD_ARGS_1 (a1) \ register int _a2 __asm__ ("a2") = _a2tmp; #define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2) #define LOAD_ARGS_3(a1, a2, a3) \ int _a3tmp = (int) (a3); \ LOAD_ARGS_2 (a1, a2) \ register int _a3 __asm__ ("a3") = _a3tmp; #define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3) #define LOAD_ARGS_4(a1, a2, a3, a4) \ int _a4tmp = (int) (a4); \ LOAD_ARGS_3 (a1, a2, a3) \ register int _a4 __asm__ ("a4") = _a4tmp; #define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4) #define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ int _v1tmp = (int) (a5); \ LOAD_ARGS_4 (a1, a2, a3, a4) \ register int _v1 __asm__ ("v1") = _v1tmp; #define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1) #define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ int _v2tmp = (int) (a6); \ LOAD_ARGS_5 (a1, a2, a3, a4, a5) \ register int _v2 __asm__ ("v2") = _v2tmp; #define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2) #define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \ int _v3tmp = (int) (a7); \ LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \ register int _v3 __asm__ ("v3") = _v3tmp; #define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3) #endif /* __ASSEMBLER__ */ #endif /* _BITS_SYSCALLS_H */