diff options
Diffstat (limited to 'sysdeps/unix')
-rw-r--r-- | sysdeps/unix/sysv/linux/mips/unwind-arch.h | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/unwind-arch.h b/sysdeps/unix/sysv/linux/mips/unwind-arch.h deleted file mode 100644 index 38bc60cde6..0000000000 --- a/sysdeps/unix/sysv/linux/mips/unwind-arch.h +++ /dev/null @@ -1,67 +0,0 @@ -/* Return backtrace of current program state. Arch-specific bits. - Copyright (C) 2020-2021 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <https://www.gnu.org/licenses/>. */ - -#ifndef _UNWIND_ARCH_H -#define _UNWIND_ARCH_H - -#include <stdint.h> - -/* MIPS fallback code handle a frame where its FDE can not be obtained - (for instance a signal frame) by reading the kernel allocated signal frame - and adding '2' to the value of 'sc_pc' [1]. The added value is used to - recognize an end of an EH region on mips16 [2]. - - The idea here is to adjust the obtained signal frame ADDR value and remove - the libgcc added value by checking if the previous frame is a signal frame - one. - - [1] libgcc/config/mips/linux-unwind.h from gcc code. - [2] gcc/config/mips/mips.h from gcc code. */ - -static inline void * -unwind_arch_adjustment (void *prev, void *addr) -{ - uint32_t *pc = (uint32_t *) prev; - - if (pc == NULL) - return addr; - - /* For MIPS16 or microMIPS frame libgcc makes no adjustment. */ - if ((uintptr_t) pc & 0x3) - return addr; - - /* The vDSO containes either - - 24021061 li v0, 0x1061 (rt_sigreturn) - 0000000c syscall - or - 24021017 li v0, 0x1017 (sigreturn) - 0000000c syscall */ - if (pc[1] != 0x0000000c) - return addr; -#if _MIPS_SIM == _ABIO32 - if (pc[0] == (0x24020000 | __NR_sigreturn)) - return (void *) ((uintptr_t) addr - 2); -#endif - if (pc[0] == (0x24020000 | __NR_rt_sigreturn)) - return (void *) ((uintptr_t) addr - 2); - - return addr; -} - -#endif |