1 #ifndef _BITS_SYSCALLS_H 2 #define _BITS_SYSCALLS_H 3 #ifndef _SYSCALL_H 4 # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead." 5 #endif 6 7 /* 8 Some of the sneaky macros in the code were taken from 9 glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h 10 */ 11 12 #ifdef __ASSEMBLER__ 13 14 /* Call a given syscall, with arguments loaded. For EABI, we must 15 save and restore r7 for the syscall number. Unlike the DO_CALL 16 macro in glibc, this macro does not load syscall arguments. */ 17 #undef DO_CALL 18 #if defined(__ARM_EABI__) 19 #define DO_CALL(syscall_name) \ 20 mov ip, r7; \ 21 ldr r7, =SYS_ify (syscall_name); \ 22 swi 0x0; \ 23 mov r7, ip; 24 #else 25 #define DO_CALL(syscall_name) \ 26 swi SYS_ify (syscall_name); 27 #endif 28 29 #else 30 31 #include <errno.h> 32 33 #define INLINE_SYSCALL_NCS(name, nr, args...) \ 34 (__extension__ \ 35 ({ \ 36 unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args);\ 37 if (unlikely (INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, ))) \ 38 { \ 39 __set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, )); \ 40 _inline_sys_result = (unsigned int) -1; \ 41 } \ 42 (int) _inline_sys_result; \ 43 }) \ 44 ) 45 46 #define INTERNAL_SYSCALL_ARM(name, err, nr, args...) \ 47 INTERNAL_SYSCALL_NCS(__ARM_NR_##name, err, nr, args) 48 49 #if defined(__thumb__) 50 /* We can't use push/pop inside the asm because that breaks 51 unwinding (ie. thread cancellation). 52 */ 53 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ 54 (__extension__ \ 55 ({ unsigned int __internal_sys_result; \ 56 { \ 57 int _sys_buf[2]; \ 58 register int __a1 __asm__ ("a1"); \ 59 register int *__v3 __asm__ ("v3") = _sys_buf; \ 60 *__v3 = (int) (name); \ 61 LOAD_ARGS_##nr (args) \ 62 __asm__ __volatile__ ("str r7, [v3, #4]\n" \ 63 "\tldr r7, [v3]\n" \ 64 "\tswi 0 @ syscall " #name "\n" \ 65 "\tldr r7, [v3, #4]" \ 66 : "=r" (__a1) \ 67 : "r" (__v3) ASM_ARGS_##nr \ 68 : "memory"); \ 69 __internal_sys_result = __a1; \ 70 } \ 71 (int) __internal_sys_result; }) \ 72 ) 73 #else /* ARM */ 74 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ 75 (__extension__ \ 76 ({unsigned int __internal_sys_result; \ 77 { \ 78 register int __a1 __asm__ ("r0"), _nr __asm__ ("r7"); \ 79 LOAD_ARGS_##nr (args) \ 80 _nr = (name); \ 81 __asm__ __volatile__ ("swi 0x0 @ syscall " #name \ 82 : "=r" (__a1) \ 83 : "r" (_nr) ASM_ARGS_##nr \ 84 : "memory"); \ 85 __internal_sys_result = __a1; \ 86 } \ 87 (int) __internal_sys_result; }) \ 88 ) 89 #endif 90 91 #define INTERNAL_SYSCALL_ERROR_P(val, err) \ 92 ((unsigned int) (val) >= 0xfffff001u) 93 94 #define LOAD_ARGS_0() 95 #define ASM_ARGS_0 96 #define LOAD_ARGS_1(a1) \ 97 int __a1tmp = (int) (a1); \ 98 LOAD_ARGS_0 () \ 99 __a1 = __a1tmp; 100 #define ASM_ARGS_1 ASM_ARGS_0, "r" (__a1) 101 #define LOAD_ARGS_2(a1, a2) \ 102 int __a2tmp = (int) (a2); \ 103 LOAD_ARGS_1 (a1) \ 104 register int __a2 __asm__ ("a2") = __a2tmp; 105 #define ASM_ARGS_2 ASM_ARGS_1, "r" (__a2) 106 #define LOAD_ARGS_3(a1, a2, a3) \ 107 int __a3tmp = (int) (a3); \ 108 LOAD_ARGS_2 (a1, a2) \ 109 register int __a3 __asm__ ("a3") = __a3tmp; 110 #define ASM_ARGS_3 ASM_ARGS_2, "r" (__a3) 111 #define LOAD_ARGS_4(a1, a2, a3, a4) \ 112 int __a4tmp = (int) (a4); \ 113 LOAD_ARGS_3 (a1, a2, a3) \ 114 register int __a4 __asm__ ("a4") = __a4tmp; 115 #define ASM_ARGS_4 ASM_ARGS_3, "r" (__a4) 116 #define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ 117 int __v1tmp = (int) (a5); \ 118 LOAD_ARGS_4 (a1, a2, a3, a4) \ 119 register int __v1 __asm__ ("v1") = __v1tmp; 120 #define ASM_ARGS_5 ASM_ARGS_4, "r" (__v1) 121 #define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ 122 int __v2tmp = (int) (a6); \ 123 LOAD_ARGS_5 (a1, a2, a3, a4, a5) \ 124 register int __v2 __asm__ ("v2") = __v2tmp; 125 #define ASM_ARGS_6 ASM_ARGS_5, "r" (__v2) 126 #ifndef __thumb__ 127 #define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \ 128 int __v3tmp = (int) (a7); \ 129 LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \ 130 register int __v3 __asm__ ("v3") = __v3tmp; 131 #define ASM_ARGS_7 ASM_ARGS_6, "r" (__v3) 132 #endif 133 134 #endif /* __ASSEMBLER__ */ 135 #endif /* _BITS_SYSCALLS_H */ 136