| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Zhangjin Wu | 211 | 99.53% | 3 | 75.00% |
| Willy Tarreau | 1 | 0.47% | 1 | 25.00% |
| Total | 212 | 4 |
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ /* * PowerPC specific definitions for NOLIBC * Copyright (C) 2023 Zhangjin Wu <falcon@tinylab.org> */ #ifndef _NOLIBC_ARCH_POWERPC_H #define _NOLIBC_ARCH_POWERPC_H #include "compiler.h" #include "crt.h" /* Syscalls for PowerPC : * - stack is 16-byte aligned * - syscall number is passed in r0 * - arguments are in r3, r4, r5, r6, r7, r8, r9 * - the system call is performed by calling "sc" * - syscall return comes in r3, and the summary overflow bit is checked * to know if an error occurred, in which case errno is in r3. * - 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. */ #define _NOLIBC_SYSCALL_CLOBBERLIST \ "memory", "cr0", "r12", "r11", "r10", "r9" #define my_syscall0(num) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num) \ : \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8", "r7", "r6", "r5", "r4" \ ); \ _ret; \ }) #define my_syscall1(num, arg1) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8", "r7", "r6", "r5", "r4" \ ); \ _ret; \ }) #define my_syscall2(num, arg1, arg2) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ register long _arg2 __asm__ ("r4") = (long)(arg2); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num), "+r"(_arg2) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8", "r7", "r6", "r5" \ ); \ _ret; \ }) #define my_syscall3(num, arg1, arg2, arg3) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ register long _arg2 __asm__ ("r4") = (long)(arg2); \ register long _arg3 __asm__ ("r5") = (long)(arg3); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num), "+r"(_arg2), "+r"(_arg3) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8", "r7", "r6" \ ); \ _ret; \ }) #define my_syscall4(num, arg1, arg2, arg3, arg4) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ register long _arg2 __asm__ ("r4") = (long)(arg2); \ register long _arg3 __asm__ ("r5") = (long)(arg3); \ register long _arg4 __asm__ ("r6") = (long)(arg4); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num), "+r"(_arg2), "+r"(_arg3), \ "+r"(_arg4) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8", "r7" \ ); \ _ret; \ }) #define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ register long _arg2 __asm__ ("r4") = (long)(arg2); \ register long _arg3 __asm__ ("r5") = (long)(arg3); \ register long _arg4 __asm__ ("r6") = (long)(arg4); \ register long _arg5 __asm__ ("r7") = (long)(arg5); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num), "+r"(_arg2), "+r"(_arg3), \ "+r"(_arg4), "+r"(_arg5) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST, "r8" \ ); \ _ret; \ }) #define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ ({ \ register long _ret __asm__ ("r3"); \ register long _num __asm__ ("r0") = (num); \ register long _arg1 __asm__ ("r3") = (long)(arg1); \ register long _arg2 __asm__ ("r4") = (long)(arg2); \ register long _arg3 __asm__ ("r5") = (long)(arg3); \ register long _arg4 __asm__ ("r6") = (long)(arg4); \ register long _arg5 __asm__ ("r7") = (long)(arg5); \ register long _arg6 __asm__ ("r8") = (long)(arg6); \ \ __asm__ volatile ( \ " sc\n" \ " bns+ 1f\n" \ " neg %0, %0\n" \ "1:\n" \ : "=r"(_ret), "+r"(_num), "+r"(_arg2), "+r"(_arg3), \ "+r"(_arg4), "+r"(_arg5), "+r"(_arg6) \ : "0"(_arg1) \ : _NOLIBC_SYSCALL_CLOBBERLIST \ ); \ _ret; \ }) #ifndef __powerpc64__ /* FIXME: For 32-bit PowerPC, with newer gcc compilers (e.g. gcc 13.1.0), * "omit-frame-pointer" fails with __attribute__((no_stack_protector)) but * works with __attribute__((__optimize__("-fno-stack-protector"))) */ #ifdef __no_stack_protector #undef __no_stack_protector #define __no_stack_protector __attribute__((__optimize__("-fno-stack-protector"))) #endif #endif /* !__powerpc64__ */ /* startup code */ void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void) { #ifdef __powerpc64__ #if _CALL_ELF == 2 /* with -mabi=elfv2, save TOC/GOT pointer to r2 * r12 is global entry pointer, we use it to compute TOC from r12 * https://www.llvm.org/devmtg/2014-04/PDFs/Talks/Euro-LLVM-2014-Weigand.pdf * https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.pdf */ __asm__ volatile ( "addis 2, 12, .TOC. - _start@ha\n" "addi 2, 2, .TOC. - _start@l\n" ); #endif /* _CALL_ELF == 2 */ __asm__ volatile ( "mr 3, 1\n" /* save stack pointer to r3, as arg1 of _start_c */ "clrrdi 1, 1, 4\n" /* align the stack to 16 bytes */ "li 0, 0\n" /* zero the frame pointer */ "stdu 1, -32(1)\n" /* the initial stack frame */ "bl _start_c\n" /* transfer to c runtime */ ); #else __asm__ volatile ( "mr 3, 1\n" /* save stack pointer to r3, as arg1 of _start_c */ "clrrwi 1, 1, 4\n" /* align the stack to 16 bytes */ "li 0, 0\n" /* zero the frame pointer */ "stwu 1, -16(1)\n" /* the initial stack frame */ "bl _start_c\n" /* transfer to c runtime */ ); #endif __builtin_unreachable(); } #endif /* _NOLIBC_ARCH_POWERPC_H */
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