| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Willy Tarreau | 176 | 85.02% | 4 | 36.36% |
| Zhangjin Wu | 26 | 12.56% | 4 | 36.36% |
| Thomas Weißschuh | 5 | 2.42% | 3 | 27.27% |
| Total | 207 | 11 |
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ /* * ARM specific definitions for NOLIBC * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu> */ #ifndef _NOLIBC_ARCH_ARM_H #define _NOLIBC_ARCH_ARM_H #include "compiler.h" #include "crt.h" /* Syscalls for ARM in ARM or Thumb modes : * - registers are 32-bit * - stack is 8-byte aligned * ( http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka4127.html) * - syscall number is passed in r7 * - arguments are in r0, r1, r2, r3, r4, r5 * - the system call is performed by calling svc #0 * - syscall return comes in r0. * - only lr is clobbered. * - 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. * - the syscall number is always specified last in order to allow to force * some registers before (gcc refuses a %-register at the last position). * - in thumb mode without -fomit-frame-pointer, r7 is also used to store the * frame pointer, and we cannot directly assign it as a register variable, * nor can we clobber it. Instead we assign the r6 register and swap it * with r7 before calling svc, and r6 is marked as clobbered. * We're just using any regular register which we assign to r7 after saving * it. * * Also, ARM supports the old_select syscall if newselect is not available */ #define __ARCH_WANT_SYS_OLD_SELECT #if (defined(__THUMBEB__) || defined(__THUMBEL__)) && \ !defined(NOLIBC_OMIT_FRAME_POINTER) /* swap r6,r7 needed in Thumb mode since we can't use nor clobber r7 */ #define _NOLIBC_SYSCALL_REG "r6" #define _NOLIBC_THUMB_SET_R7 "eor r7, r6\neor r6, r7\neor r7, r6\n" #define _NOLIBC_THUMB_RESTORE_R7 "mov r7, r6\n" #else /* we're in ARM mode */ /* in Arm mode we can directly use r7 */ #define _NOLIBC_SYSCALL_REG "r7" #define _NOLIBC_THUMB_SET_R7 "" #define _NOLIBC_THUMB_RESTORE_R7 "" #endif /* end THUMB */ #define my_syscall0(num) \ ({ \ register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \ register long _arg1 __asm__ ("r0"); \ \ __asm__ volatile ( \ _NOLIBC_THUMB_SET_R7 \ "svc #0\n" \ _NOLIBC_THUMB_RESTORE_R7 \ : "=r"(_arg1), "=r"(_num) \ : "r"(_arg1), \ "r"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #define my_syscall1(num, arg1) \ ({ \ register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \ register long _arg1 __asm__ ("r0") = (long)(arg1); \ \ __asm__ volatile ( \ _NOLIBC_THUMB_SET_R7 \ "svc #0\n" \ _NOLIBC_THUMB_RESTORE_R7 \ : "=r"(_arg1), "=r" (_num) \ : "r"(_arg1), \ "r"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #define my_syscall2(num, arg1, arg2) \ ({ \ register long _num __asm__(_NOLIBC_SYSCALL_REG) = (num); \ register long _arg1 __asm__ ("r0") = (long)(arg1); \ register long _arg2 __asm__ ("r1") = (long)(arg2); \ \ __asm__ volatile ( \ _NOLIBC_THUMB_SET_R7 \ "svc #0\n" \ _NOLIBC_THUMB_RESTORE_R7 \ : "=r"(_arg1), "=r" (_num) \ : "r"(_arg1), "r"(_arg2), \ "r"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #define my_syscall3(num, arg1, arg2, arg3) \ ({ \ 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); \ \ __asm__ volatile ( \ _NOLIBC_THUMB_SET_R7 \ "svc #0\n" \ _NOLIBC_THUMB_RESTORE_R7 \ : "=r"(_arg1), "=r" (_num) \ : "r"(_arg1), "r"(_arg2), "r"(_arg3), \ "r"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #define my_syscall4(num, arg1, arg2, arg3, arg4) \ ({ \ 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); \ \ __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"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ ({ \ 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); \ \ __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"(_num) \ : "memory", "cc", "lr" \ ); \ _arg1; \ }) #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("Os", "omit-frame-pointer"))) __no_stack_protector _start(void) { __asm__ volatile ( "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 */
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