diff options
Diffstat (limited to 'tools/include/nolibc/arch-aarch64.h')
| -rw-r--r-- | tools/include/nolibc/arch-aarch64.h | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/tools/include/nolibc/arch-aarch64.h b/tools/include/nolibc/arch-aarch64.h index f68baf8f395f..383baddef701 100644 --- a/tools/include/nolibc/arch-aarch64.h +++ b/tools/include/nolibc/arch-aarch64.h @@ -7,18 +7,6 @@ #ifndef _NOLIBC_ARCH_AARCH64_H #define _NOLIBC_ARCH_AARCH64_H -/* O_* macros for fcntl/open are architecture-specific */ -#define O_RDONLY 0 -#define O_WRONLY 1 -#define O_RDWR 2 -#define O_CREAT 0x40 -#define O_EXCL 0x80 -#define O_NOCTTY 0x100 -#define O_TRUNC 0x200 -#define O_APPEND 0x400 -#define O_NONBLOCK 0x800 -#define O_DIRECTORY 0x4000 - /* The struct returned by the newfstatat() syscall. Differs slightly from the * x86_64's stat one by field ordering, so be careful. */ @@ -181,19 +169,31 @@ struct sys_stat_struct { _arg1; \ }) -/* startup code */ -__asm__ (".section .text\n" - ".weak _start\n" - "_start:\n" - "ldr x0, [sp]\n" // argc (x0) was in the stack - "add x1, sp, 8\n" // argv (x1) = sp - "lsl x2, x0, 3\n" // envp (x2) = 8*argc ... - "add x2, x2, 8\n" // + 8 (skip null) - "add x2, x2, x1\n" // + argv - "and sp, x1, -16\n" // sp must be 16-byte aligned in the callee - "bl main\n" // main() returns the status code, we'll exit with it. - "mov x8, 93\n" // NR_exit == 93 - "svc #0\n" - ""); +char **environ __attribute__((weak)); +const unsigned long *_auxv __attribute__((weak)); +/* startup code */ +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) +{ + __asm__ volatile ( + "ldr x0, [sp]\n" // argc (x0) was in the stack + "add x1, sp, 8\n" // argv (x1) = sp + "lsl x2, x0, 3\n" // envp (x2) = 8*argc ... + "add x2, x2, 8\n" // + 8 (skip null) + "add x2, x2, x1\n" // + argv + "adrp x3, environ\n" // x3 = &environ (high bits) + "str x2, [x3, #:lo12:environ]\n" // store envp into environ + "mov x4, x2\n" // search for auxv (follows NULL after last env) + "0:\n" + "ldr x5, [x4], 8\n" // x5 = *x4; x4 += 8 + "cbnz x5, 0b\n" // and stop at NULL after last env + "adrp x3, _auxv\n" // x3 = &_auxv (high bits) + "str x4, [x3, #:lo12:_auxv]\n" // store x4 into _auxv + "and sp, x1, -16\n" // sp must be 16-byte aligned in the callee + "bl main\n" // main() returns the status code, we'll exit with it. + "mov x8, 93\n" // NR_exit == 93 + "svc #0\n" + ); + __builtin_unreachable(); +} #endif // _NOLIBC_ARCH_AARCH64_H |