diff options
Diffstat (limited to 'tools/include/nolibc/arch-arm.h')
| -rw-r--r-- | tools/include/nolibc/arch-arm.h | 74 |
1 files changed, 51 insertions, 23 deletions
diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-arm.h index 42499f23e73c..ca4c66987497 100644 --- a/tools/include/nolibc/arch-arm.h +++ b/tools/include/nolibc/arch-arm.h @@ -7,6 +7,8 @@ #ifndef _NOLIBC_ARCH_ARM_H #define _NOLIBC_ARCH_ARM_H +#include "compiler.h" + /* The struct returned by the stat() syscall, 32-bit only, the syscall returns * exactly 56 bytes (stops before the unused array). In big endian, the format * differs as devices are returned as short only. @@ -196,41 +198,67 @@ struct sys_stat_struct { _arg1; \ }) +#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \ + register long _arg1 __asm__ ("r0") = (long)(arg1); \ + register long _arg2 __asm__ ("r1") = (long)(arg2); \ + register long _arg3 __asm__ ("r2") = (long)(arg3); \ + register long _arg4 __asm__ ("r3") = (long)(arg4); \ + register long _arg5 __asm__ ("r4") = (long)(arg5); \ + register long _arg6 __asm__ ("r5") = (long)(arg6); \ + \ + __asm__ volatile ( \ + _NOLIBC_THUMB_SET_R7 \ + "svc #0\n" \ + _NOLIBC_THUMB_RESTORE_R7 \ + : "=r"(_arg1), "=r" (_num) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \ + "r"(_arg6), "r"(_num) \ + : "memory", "cc", "lr" \ + ); \ + _arg1; \ +}) + + char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); /* startup code */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_protector _start(void) { __asm__ volatile ( - "pop {%r0}\n" // argc was in the stack - "mov %r1, %sp\n" // argv = sp +#ifdef _NOLIBC_STACKPROTECTOR + "bl __stack_chk_init\n" /* initialize stack protector */ +#endif + "pop {%r0}\n" /* argc was in the stack */ + "mov %r1, %sp\n" /* argv = sp */ - "add %r2, %r0, $1\n" // envp = (argc + 1) ... - "lsl %r2, %r2, $2\n" // * 4 ... - "add %r2, %r2, %r1\n" // + argv - "ldr %r3, 1f\n" // r3 = &environ (see below) - "str %r2, [r3]\n" // store envp into environ + "add %r2, %r0, $1\n" /* envp = (argc + 1) ... */ + "lsl %r2, %r2, $2\n" /* * 4 ... */ + "add %r2, %r2, %r1\n" /* + argv */ + "ldr %r3, 1f\n" /* r3 = &environ (see below) */ + "str %r2, [r3]\n" /* store envp into environ */ - "mov r4, r2\n" // search for auxv (follows NULL after last env) + "mov r4, r2\n" /* search for auxv (follows NULL after last env) */ "0:\n" - "mov r5, r4\n" // r5 = r4 - "add r4, r4, #4\n" // r4 += 4 - "ldr r5,[r5]\n" // r5 = *r5 = *(r4-4) - "cmp r5, #0\n" // and stop at NULL after last env + "mov r5, r4\n" /* r5 = r4 */ + "add r4, r4, #4\n" /* r4 += 4 */ + "ldr r5,[r5]\n" /* r5 = *r5 = *(r4-4) */ + "cmp r5, #0\n" /* and stop at NULL after last env */ "bne 0b\n" - "ldr %r3, 2f\n" // r3 = &_auxv (low bits) - "str r4, [r3]\n" // store r4 into _auxv + "ldr %r3, 2f\n" /* r3 = &_auxv (low bits) */ + "str r4, [r3]\n" /* store r4 into _auxv */ - "mov %r3, $8\n" // AAPCS : sp must be 8-byte aligned in the - "neg %r3, %r3\n" // callee, and bl doesn't push (lr=pc) - "and %r3, %r3, %r1\n" // so we do sp = r1(=sp) & r3(=-8); - "mov %sp, %r3\n" // + "mov %r3, $8\n" /* AAPCS : sp must be 8-byte aligned in the */ + "neg %r3, %r3\n" /* callee, and bl doesn't push (lr=pc) */ + "and %r3, %r3, %r1\n" /* so we do sp = r1(=sp) & r3(=-8); */ + "mov %sp, %r3\n" - "bl main\n" // main() returns the status code, we'll exit with it. - "movs r7, $1\n" // NR_exit == 1 + "bl main\n" /* main() returns the status code, we'll exit with it. */ + "movs r7, $1\n" /* NR_exit == 1 */ "svc $0x00\n" - ".align 2\n" // below are the pointers to a few variables + ".align 2\n" /* below are the pointers to a few variables */ "1:\n" ".word environ\n" "2:\n" @@ -239,4 +267,4 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) __builtin_unreachable(); } -#endif // _NOLIBC_ARCH_ARM_H +#endif /* _NOLIBC_ARCH_ARM_H */ |