diff options
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/ChangeLog | 6 | ||||
| -rw-r--r-- | backends/Makefile.am | 2 | ||||
| -rw-r--r-- | backends/aarch64_init.c | 1 | ||||
| -rw-r--r-- | backends/aarch64_unwind.c | 83 |
4 files changed, 91 insertions, 1 deletions
diff --git a/backends/ChangeLog b/backends/ChangeLog index 8b1c4f52..1ac5bab3 100644 --- a/backends/ChangeLog +++ b/backends/ChangeLog @@ -6,6 +6,12 @@ 2017-02-09 Ulf Hermann <[email protected]> + * aarch64_unwind.c: New file + * Makefile.am (aarch64_SRCS): Add aarch64_unwind.c + * aarch64_init.c (aarch64_init): Hook aarch64_unwind + +2017-02-09 Ulf Hermann <[email protected]> + * x86_64_unwind.c: New file * Makefile.am (x86_64_SRCS): Add x86_64_unwind.c * x86_64_init.c (x86_64_init): Hook x86_64_unwind diff --git a/backends/Makefile.am b/backends/Makefile.am index 22eb6ac6..ff80a82c 100644 --- a/backends/Makefile.am +++ b/backends/Makefile.am @@ -80,7 +80,7 @@ am_libebl_arm_pic_a_OBJECTS = $(arm_SRCS:.c=.os) aarch64_SRCS = aarch64_init.c aarch64_regs.c aarch64_symbol.c \ aarch64_corenote.c aarch64_retval.c aarch64_cfi.c \ - aarch64_initreg.c + aarch64_initreg.c aarch64_unwind.c libebl_aarch64_pic_a_SOURCES = $(aarch64_SRCS) am_libebl_aarch64_pic_a_OBJECTS = $(aarch64_SRCS:.c=.os) diff --git a/backends/aarch64_init.c b/backends/aarch64_init.c index 6395f117..08664943 100644 --- a/backends/aarch64_init.c +++ b/backends/aarch64_init.c @@ -63,6 +63,7 @@ aarch64_init (Elf *elf __attribute__ ((unused)), + ALT_FRAME_RETURN_COLUMN (used when LR isn't used) = 97 DWARF regs. */ eh->frame_nregs = 97; HOOK (eh, set_initial_registers_tid); + HOOK (eh, unwind); return MODVERSION; } diff --git a/backends/aarch64_unwind.c b/backends/aarch64_unwind.c new file mode 100644 index 00000000..e0a7e96e --- /dev/null +++ b/backends/aarch64_unwind.c @@ -0,0 +1,83 @@ +/* Get previous frame state for an existing frame state. + Copyright (C) 2016 The Qt Company Ltd. + This file is part of elfutils. + + This file is free software; you can redistribute it and/or modify + it under the terms of either + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at + your option) any later version + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at + your option) any later version + + or both in parallel, as here. + + elfutils 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 + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see <http://www.gnu.org/licenses/>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#define BACKEND aarch64_ +#define FP_REG 29 +#define LR_REG 30 +#define SP_REG 31 +#define FP_OFFSET 0 +#define LR_OFFSET 8 +#define SP_OFFSET 16 + +#include "libebl_CPU.h" + +/* There was no CFI. Maybe we happen to have a frame pointer and can unwind from that? */ + +bool +EBLHOOK(unwind) (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr pc __attribute__ ((unused)), + ebl_tid_registers_t *setfunc, ebl_tid_registers_get_t *getfunc, + ebl_pid_memory_read_t *readfunc, void *arg, + bool *signal_framep __attribute__ ((unused))) +{ + Dwarf_Word fp, lr, sp; + + if (!getfunc(LR_REG, 1, &lr, arg)) + return false; + + if (lr == 0 || !setfunc(-1, 1, &lr, arg)) + return false; + + if (!getfunc(FP_REG, 1, &fp, arg)) + fp = 0; + + if (!getfunc(SP_REG, 1, &sp, arg)) + sp = 0; + + Dwarf_Word newLr, newFp, newSp; + + if (!readfunc(fp + LR_OFFSET, &newLr, arg)) + newLr = 0; + + if (!readfunc(fp + FP_OFFSET, &newFp, arg)) + newFp = 0; + + newSp = fp + SP_OFFSET; + + // These are not fatal if they don't work. They will just prevent unwinding at the next frame. + setfunc(LR_REG, 1, &newLr, arg); + setfunc(FP_REG, 1, &newFp, arg); + setfunc(SP_REG, 1, &newSp, arg); + + // If the fp is invalid, we might still have a valid lr. + // But if the fp is valid, then the stack should be moving in the right direction. + return fp == 0 || newSp > sp; +} |