summaryrefslogtreecommitdiff
path: root/tools/include/nolibc/arch-mips.h
diff options
context:
space:
mode:
Diffstat (limited to 'tools/include/nolibc/arch-mips.h')
-rw-r--r--tools/include/nolibc/arch-mips.h254
1 files changed, 148 insertions, 106 deletions
diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h
index db24e0837a39..a72506ceec6b 100644
--- a/tools/include/nolibc/arch-mips.h
+++ b/tools/include/nolibc/arch-mips.h
@@ -8,34 +8,11 @@
#define _NOLIBC_ARCH_MIPS_H
#include "compiler.h"
+#include "crt.h"
-/* The struct returned by the stat() syscall. 88 bytes are returned by the
- * syscall.
- */
-struct sys_stat_struct {
- unsigned int st_dev;
- long st_pad1[3];
- unsigned long st_ino;
- unsigned int st_mode;
- unsigned int st_nlink;
- unsigned int st_uid;
- unsigned int st_gid;
- unsigned int st_rdev;
- long st_pad2[2];
- long st_size;
- long st_pad3;
-
- long st_atime;
- long st_atime_nsec;
- long st_mtime;
- long st_mtime_nsec;
-
- long st_ctime;
- long st_ctime_nsec;
- long st_blksize;
- long st_blocks;
- long st_pad4[14];
-};
+#if !defined(_ABIO32) && !defined(_ABIN32) && !defined(_ABI64)
+#error Unsupported MIPS ABI
+#endif
/* Syscalls for MIPS ABI O32 :
* - WARNING! there's always a delayed slot!
@@ -55,21 +32,45 @@ struct sys_stat_struct {
* - the arguments are cast to long and assigned into the target registers
* which are then simply passed as registers to the asm code, so that we
* don't have to experience issues with register constraints.
+ *
+ * Syscalls for MIPS ABI N32, same as ABI O32 with the following differences :
+ * - arguments are in a0, a1, a2, a3, t0, t1, t2, t3.
+ * t0..t3 are also known as a4..a7.
+ * - stack is 16-byte aligned
*/
+#if defined(_ABIO32)
+
+#define _NOLIBC_SYSCALL_CLOBBERLIST \
+ "memory", "cc", "at", "v1", "hi", "lo", \
+ "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9"
+#define _NOLIBC_SYSCALL_STACK_RESERVE "addiu $sp, $sp, -32\n"
+#define _NOLIBC_SYSCALL_STACK_UNRESERVE "addiu $sp, $sp, 32\n"
+
+#else /* _ABIN32 || _ABI64 */
+
+/* binutils, GCC and clang disagree about register aliases, use numbers instead. */
+#define _NOLIBC_SYSCALL_CLOBBERLIST \
+ "memory", "cc", "at", "v1", \
+ "10", "11", "12", "13", "14", "15", "24", "25"
+
+#define _NOLIBC_SYSCALL_STACK_RESERVE
+#define _NOLIBC_SYSCALL_STACK_UNRESERVE
+
+#endif /* _ABIO32 */
+
#define my_syscall0(num) \
({ \
register long _num __asm__ ("v0") = (num); \
register long _arg4 __asm__ ("a3"); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "r"(_num) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
@@ -79,16 +80,15 @@ struct sys_stat_struct {
register long _num __asm__ ("v0") = (num); \
register long _arg1 __asm__ ("a0") = (long)(arg1); \
register long _arg4 __asm__ ("a3"); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
@@ -99,16 +99,15 @@ struct sys_stat_struct {
register long _arg1 __asm__ ("a0") = (long)(arg1); \
register long _arg2 __asm__ ("a1") = (long)(arg2); \
register long _arg4 __asm__ ("a3"); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
@@ -120,16 +119,15 @@ struct sys_stat_struct {
register long _arg2 __asm__ ("a1") = (long)(arg2); \
register long _arg3 __asm__ ("a2") = (long)(arg3); \
register long _arg4 __asm__ ("a3"); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
@@ -141,20 +139,21 @@ struct sys_stat_struct {
register long _arg2 __asm__ ("a1") = (long)(arg2); \
register long _arg3 __asm__ ("a2") = (long)(arg3); \
register long _arg4 __asm__ ("a3") = (long)(arg4); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
+#if defined(_ABIO32)
+
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("v0") = (num); \
@@ -163,68 +162,111 @@ struct sys_stat_struct {
register long _arg3 __asm__ ("a2") = (long)(arg3); \
register long _arg4 __asm__ ("a3") = (long)(arg4); \
register long _arg5 = (long)(arg5); \
- \
- __asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"sw %7, 16($sp)\n" \
- "syscall\n " \
- "addiu $sp, $sp, 32\n" \
+ "syscall\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
- : "memory", "cc", "at", "v1", "hi", "lo", \
- "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
-char **environ __attribute__((weak));
-const unsigned long *_auxv __attribute__((weak));
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("v0") = (num); \
+ register long _arg1 __asm__ ("a0") = (long)(arg1); \
+ register long _arg2 __asm__ ("a1") = (long)(arg2); \
+ register long _arg3 __asm__ ("a2") = (long)(arg3); \
+ register long _arg4 __asm__ ("a3") = (long)(arg4); \
+ register long _arg5 = (long)(arg5); \
+ register long _arg6 = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
+ "sw %7, 16($sp)\n" \
+ "sw %8, 20($sp)\n" \
+ "syscall\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
+ : "=r" (_num), "=r"(_arg4) \
+ : "0"(_num), \
+ "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
+ "r"(_arg6) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg4 ? -_num : _num; \
+})
+#else /* _ABIN32 || _ABI64 */
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("v0") = (num); \
+ register long _arg1 __asm__ ("$4") = (long)(arg1); \
+ register long _arg2 __asm__ ("$5") = (long)(arg2); \
+ register long _arg3 __asm__ ("$6") = (long)(arg3); \
+ register long _arg4 __asm__ ("$7") = (long)(arg4); \
+ register long _arg5 __asm__ ("$8") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "syscall\n" \
+ : "=r" (_num), "=r"(_arg4) \
+ : "0"(_num), \
+ "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg4 ? -_num : _num; \
+})
+
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("v0") = (num); \
+ register long _arg1 __asm__ ("$4") = (long)(arg1); \
+ register long _arg2 __asm__ ("$5") = (long)(arg2); \
+ register long _arg3 __asm__ ("$6") = (long)(arg3); \
+ register long _arg4 __asm__ ("$7") = (long)(arg4); \
+ register long _arg5 __asm__ ("$8") = (long)(arg5); \
+ register long _arg6 __asm__ ("$9") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "syscall\n" \
+ : "=r" (_num), "=r"(_arg4) \
+ : "0"(_num), \
+ "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
+ "r"(_arg6) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg4 ? -_num : _num; \
+})
+
+#endif /* _ABIO32 */
+
+#ifndef NOLIBC_NO_RUNTIME
/* startup code, note that it's called __start on MIPS */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_protector __start(void)
+void __start(void);
+void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector __start(void)
{
__asm__ volatile (
- /*".set nomips16\n"*/
- ".set push\n"
- ".set noreorder\n"
- ".option pic0\n"
-#ifdef _NOLIBC_STACKPROTECTOR
- "jal __stack_chk_init\n" /* initialize stack protector */
- "nop\n" /* delayed slot */
-#endif
- /*".ent __start\n"*/
- /*"__start:\n"*/
- "lw $a0,($sp)\n" /* argc was in the stack */
- "addiu $a1, $sp, 4\n" /* argv = sp + 4 */
- "sll $a2, $a0, 2\n" /* a2 = argc * 4 */
- "add $a2, $a2, $a1\n" /* envp = argv + 4*argc ... */
- "addiu $a2, $a2, 4\n" /* ... + 4 */
- "lui $a3, %hi(environ)\n" /* load environ into a3 (hi) */
- "addiu $a3, %lo(environ)\n" /* load environ into a3 (lo) */
- "sw $a2,($a3)\n" /* store envp(a2) into environ */
-
- "move $t0, $a2\n" /* iterate t0 over envp, look for NULL */
- "0:" /* do { */
- "lw $a3, ($t0)\n" /* a3=*(t0); */
- "bne $a3, $0, 0b\n" /* } while (a3); */
- "addiu $t0, $t0, 4\n" /* delayed slot: t0+=4; */
- "lui $a3, %hi(_auxv)\n" /* load _auxv into a3 (hi) */
- "addiu $a3, %lo(_auxv)\n" /* load _auxv into a3 (lo) */
- "sw $t0, ($a3)\n" /* store t0 into _auxv */
-
- "li $t0, -8\n"
- "and $sp, $sp, $t0\n" /* sp must be 8-byte aligned */
- "addiu $sp,$sp,-16\n" /* the callee expects to save a0..a3 there! */
- "jal main\n" /* main() returns the status code, we'll exit with it. */
- "nop\n" /* delayed slot */
- "move $a0, $v0\n" /* retrieve 32-bit exit code from v0 */
- "li $v0, 4001\n" /* NR_exit == 4001 */
- "syscall\n"
- /*".end __start\n"*/
- ".set pop\n"
+ "move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
+#if defined(_ABIO32)
+ "addiu $sp, $sp, -16\n" /* the callee expects to save a0..a3 there */
+#endif /* _ABIO32 */
+ "lui $t9, %hi(_start_c)\n" /* ABI requires current function address in $t9 */
+ "ori $t9, %lo(_start_c)\n"
+#if defined(_ABI64)
+ "lui $t0, %highest(_start_c)\n"
+ "ori $t0, %higher(_start_c)\n"
+ "dsll $t0, 0x20\n"
+ "or $t9, $t0\n"
+#endif /* _ABI64 */
+ "jalr $t9\n" /* transfer to c runtime */
);
- __builtin_unreachable();
+ __nolibc_entrypoint_epilogue();
}
+#endif /* NOLIBC_NO_RUNTIME */
#endif /* _NOLIBC_ARCH_MIPS_H */
generated by cgit (git 2.34.1) at 2025-12-25 12:48:28 +0000