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Diffstat (limited to 'tools/include/nolibc/arch-arm.h')
-rw-r--r--tools/include/nolibc/arch-arm.h125
1 files changed, 41 insertions, 84 deletions
diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-arm.h
index 42499f23e73c..cae4afa7c1c7 100644
--- a/tools/include/nolibc/arch-arm.h
+++ b/tools/include/nolibc/arch-arm.h
@@ -7,42 +7,8 @@
#ifndef _NOLIBC_ARCH_ARM_H
#define _NOLIBC_ARCH_ARM_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.
- */
-struct sys_stat_struct {
-#if defined(__ARMEB__)
- unsigned short st_dev;
- unsigned short __pad1;
-#else
- unsigned long st_dev;
-#endif
- unsigned long st_ino;
- unsigned short st_mode;
- unsigned short st_nlink;
- unsigned short st_uid;
- unsigned short st_gid;
-
-#if defined(__ARMEB__)
- unsigned short st_rdev;
- unsigned short __pad2;
-#else
- unsigned long st_rdev;
-#endif
- unsigned long st_size;
- unsigned long st_blksize;
- unsigned long st_blocks;
-
- unsigned long st_atime;
- unsigned long st_atime_nsec;
- unsigned long st_mtime;
- unsigned long st_mtime_nsec;
-
- unsigned long st_ctime;
- unsigned long st_ctime_nsec;
- unsigned long __unused[2];
-};
+#include "compiler.h"
+#include "crt.h"
/* Syscalls for ARM in ARM or Thumb modes :
* - registers are 32-bit
@@ -88,8 +54,8 @@ struct sys_stat_struct {
({ \
register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \
register long _arg1 __asm__ ("r0"); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -105,8 +71,8 @@ struct sys_stat_struct {
({ \
register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \
register long _arg1 __asm__ ("r0") = (long)(arg1); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -123,8 +89,8 @@ struct sys_stat_struct {
register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \
register long _arg1 __asm__ ("r0") = (long)(arg1); \
register long _arg2 __asm__ ("r1") = (long)(arg2); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -142,8 +108,8 @@ struct sys_stat_struct {
register long _arg1 __asm__ ("r0") = (long)(arg1); \
register long _arg2 __asm__ ("r1") = (long)(arg2); \
register long _arg3 __asm__ ("r2") = (long)(arg3); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -162,8 +128,8 @@ struct sys_stat_struct {
register long _arg2 __asm__ ("r1") = (long)(arg2); \
register long _arg3 __asm__ ("r2") = (long)(arg3); \
register long _arg4 __asm__ ("r3") = (long)(arg4); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -183,8 +149,8 @@ struct sys_stat_struct {
register long _arg3 __asm__ ("r2") = (long)(arg3); \
register long _arg4 __asm__ ("r3") = (long)(arg4); \
register long _arg5 __asm__ ("r4") = (long)(arg5); \
- \
- __asm__ volatile ( \
+ \
+ __asm__ volatile ( \
_NOLIBC_THUMB_SET_R7 \
"svc #0\n" \
_NOLIBC_THUMB_RESTORE_R7 \
@@ -196,47 +162,38 @@ struct sys_stat_struct {
_arg1; \
})
-char **environ __attribute__((weak));
-const unsigned long *_auxv __attribute__((weak));
+#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; \
+})
/* startup code */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
{
__asm__ volatile (
- "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
-
- "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
- "bne 0b\n"
- "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" //
-
- "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
- "1:\n"
- ".word environ\n"
- "2:\n"
- ".word _auxv\n"
+ "mov %r0, sp\n" /* save stack pointer to %r0, as arg1 of _start_c */
+ "and ip, %r0, #-8\n" /* sp must be 8-byte aligned in the callee */
+ "mov sp, ip\n"
+ "bl _start_c\n" /* transfer to c runtime */
);
__builtin_unreachable();
}
-#endif // _NOLIBC_ARCH_ARM_H
+#endif /* _NOLIBC_ARCH_ARM_H */
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