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Diffstat (limited to 'tools/include/nolibc/arch-mips.h')
-rw-r--r--tools/include/nolibc/arch-mips.h125
1 files changed, 101 insertions, 24 deletions
diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h
index 4ab6fa54beee..a72506ceec6b 100644
--- a/tools/include/nolibc/arch-mips.h
+++ b/tools/include/nolibc/arch-mips.h
@@ -10,6 +10,10 @@
#include "compiler.h"
#include "crt.h"
+#if !defined(_ABIO32) && !defined(_ABIN32) && !defined(_ABI64)
+#error Unsupported MIPS ABI
+#endif
+
/* Syscalls for MIPS ABI O32 :
* - WARNING! there's always a delayed slot!
* - WARNING again, the syntax is different, registers take a '$' and numbers
@@ -28,11 +32,32 @@
* - 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) \
({ \
@@ -40,9 +65,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "r"(_num) \
: _NOLIBC_SYSCALL_CLOBBERLIST \
@@ -57,9 +82,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
- "addiu $sp, $sp, 32\n" \
+ _NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1) \
@@ -76,9 +101,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _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) \
@@ -96,9 +121,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _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) \
@@ -116,9 +141,9 @@
register long _arg4 __asm__ ("a3") = (long)(arg4); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _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) \
@@ -127,6 +152,8 @@
_arg4 ? -_num : _num; \
})
+#if defined(_ABIO32)
+
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("v0") = (num); \
@@ -137,10 +164,10 @@
register long _arg5 = (long)(arg5); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"sw %7, 16($sp)\n" \
"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), "r"(_arg5) \
@@ -160,11 +187,11 @@
register long _arg6 = (long)(arg6); \
\
__asm__ volatile ( \
- "addiu $sp, $sp, -32\n" \
+ _NOLIBC_SYSCALL_STACK_RESERVE \
"sw %7, 16($sp)\n" \
"sw %8, 20($sp)\n" \
"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), "r"(_arg5), \
@@ -174,22 +201,72 @@
_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("Os", "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 push\n"
- ".set noreorder\n"
- ".option pic0\n"
"move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
- "li $t0, -8\n"
- "and $sp, $sp, $t0\n" /* $sp must be 8-byte aligned */
+#if defined(_ABIO32)
"addiu $sp, $sp, -16\n" /* the callee expects to save a0..a3 there */
- "jal _start_c\n" /* transfer to c runtime */
- " nop\n" /* delayed slot */
- ".set pop\n"
+#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 01:49:37 +0000