| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Willy Tarreau | 143 | 50.18% | 3 | 18.75% |
| Thomas Weißschuh | 112 | 39.30% | 9 | 56.25% |
| Zhangjin Wu | 30 | 10.53% | 4 | 25.00% |
| Total | 285 | 16 |
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ /* * MIPS specific definitions for NOLIBC * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu> */ #ifndef _NOLIBC_ARCH_MIPS_H #define _NOLIBC_ARCH_MIPS_H #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 * do not. * - registers are 32-bit * - stack is 8-byte aligned * - syscall number is passed in v0 (starts at 0xfa0). * - arguments are in a0, a1, a2, a3, then the stack. The caller needs to * leave some room in the stack for the callee to save a0..a3 if needed. * - Many registers are clobbered, in fact only a0..a2 and s0..s8 are * preserved. See: https://www.linux-mips.org/wiki/Syscall as well as * scall32-o32.S in the kernel sources. * - the system call is performed by calling "syscall" * - syscall return comes in v0, and register a3 needs to be checked to know * if an error occurred, in which case errno is in v0. * - 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 ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=r"(_num), "=r"(_arg4) \ : "r"(_num) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _arg4 ? -_num : _num; \ }) #define my_syscall1(num, arg1) \ ({ \ register long _num __asm__ ("v0") = (num); \ register long _arg1 __asm__ ("a0") = (long)(arg1); \ register long _arg4 __asm__ ("a3"); \ \ __asm__ volatile ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=r"(_num), "=r"(_arg4) \ : "0"(_num), \ "r"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _arg4 ? -_num : _num; \ }) #define my_syscall2(num, arg1, arg2) \ ({ \ register long _num __asm__ ("v0") = (num); \ register long _arg1 __asm__ ("a0") = (long)(arg1); \ register long _arg2 __asm__ ("a1") = (long)(arg2); \ register long _arg4 __asm__ ("a3"); \ \ __asm__ volatile ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=r"(_num), "=r"(_arg4) \ : "0"(_num), \ "r"(_arg1), "r"(_arg2) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _arg4 ? -_num : _num; \ }) #define my_syscall3(num, arg1, arg2, arg3) \ ({ \ 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"); \ \ __asm__ volatile ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=r"(_num), "=r"(_arg4) \ : "0"(_num), \ "r"(_arg1), "r"(_arg2), "r"(_arg3) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _arg4 ? -_num : _num; \ }) #define my_syscall4(num, arg1, arg2, arg3, arg4) \ ({ \ 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); \ \ __asm__ volatile ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=r" (_num), "=r"(_arg4) \ : "0"(_num), \ "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _arg4 ? -_num : _num; \ }) #if defined(_ABIO32) #define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ ({ \ 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); \ \ __asm__ volatile ( \ _NOLIBC_SYSCALL_STACK_RESERVE \ "sw %7, 16($sp)\n" \ "syscall\n" \ _NOLIBC_SYSCALL_STACK_UNRESERVE \ : "=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__ ("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 */ /* startup code, note that it's called __start on MIPS */ void __start(void); void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector __start(void) { __asm__ volatile ( "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 */ ); __nolibc_entrypoint_epilogue(); } #endif /* _NOLIBC_ARCH_MIPS_H */
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