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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2008 CodeSourcery
- Copyright 2011 Linaro Limited
- This file is part of libunwind.
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- #include "unwind_i.h"
- #include "offsets.h"
- #ifndef UNW_REMOTE_ONLY
- HIDDEN inline int
- arm_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
- {
- #ifdef __linux__
- struct cursor *c = (struct cursor *) cursor;
- unw_tdep_context_t *uc = c->dwarf.as_arg;
- if (c->sigcontext_format == ARM_SCF_NONE)
- {
- /* Since there are no signals involved here we restore the non scratch
- registers only. */
- unsigned long regs[10];
- regs[0] = uc->regs[4];
- regs[1] = uc->regs[5];
- regs[2] = uc->regs[6];
- regs[3] = uc->regs[7];
- regs[4] = uc->regs[8];
- regs[5] = uc->regs[9];
- regs[6] = uc->regs[10];
- regs[7] = uc->regs[11]; /* FP */
- regs[8] = uc->regs[13]; /* SP */
- regs[9] = uc->regs[14]; /* LR */
- asm __volatile__ (
- "ldmia %0, {r4-r12, lr}\n"
- "mov sp, r12\n"
- "bx lr\n"
- : : "r" (regs)
- );
- }
- else
- {
- /* In case a signal frame is involved, we're using its trampoline which
- calls sigreturn. */
- struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
- sc->arm_r0 = uc->regs[0];
- sc->arm_r1 = uc->regs[1];
- sc->arm_r2 = uc->regs[2];
- sc->arm_r3 = uc->regs[3];
- sc->arm_r4 = uc->regs[4];
- sc->arm_r5 = uc->regs[5];
- sc->arm_r6 = uc->regs[6];
- sc->arm_r7 = uc->regs[7];
- sc->arm_r8 = uc->regs[8];
- sc->arm_r9 = uc->regs[9];
- sc->arm_r10 = uc->regs[10];
- sc->arm_fp = uc->regs[11]; /* FP */
- sc->arm_ip = uc->regs[12]; /* IP */
- sc->arm_sp = uc->regs[13]; /* SP */
- sc->arm_lr = uc->regs[14]; /* LR */
- sc->arm_pc = uc->regs[15]; /* PC */
- /* clear the ITSTATE bits. */
- sc->arm_cpsr &= 0xf9ff03ffUL;
- /* Set the SP and the PC in order to continue execution at the modified
- trampoline which restores the signal mask and the registers. */
- asm __volatile__ (
- "mov sp, %0\n"
- "bx %1\n"
- : : "r" (c->sigcontext_sp), "r" (c->sigcontext_pc)
- );
- }
- #else
- printf ("%s: implement me\n", __FUNCTION__);
- #endif
- return -UNW_EINVAL;
- }
- #endif /* !UNW_REMOTE_ONLY */
- static inline void
- establish_machine_state (struct cursor *c)
- {
- unw_addr_space_t as = c->dwarf.as;
- void *arg = c->dwarf.as_arg;
- unw_fpreg_t fpval;
- unw_word_t val;
- int reg;
- Debug (8, "copying out cursor state\n");
- for (reg = 0; reg <= UNW_REG_LAST; ++reg)
- {
- Debug (16, "copying %s %d\n", unw_regname (reg), reg);
- if (unw_is_fpreg (reg))
- {
- if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
- as->acc.access_fpreg (as, reg, &fpval, 1, arg);
- }
- else
- {
- if (tdep_access_reg (c, reg, &val, 0) >= 0)
- as->acc.access_reg (as, reg, &val, 1, arg);
- }
- }
- }
- PROTECTED int
- unw_resume (unw_cursor_t *cursor)
- {
- struct cursor *c = (struct cursor *) cursor;
- Debug (1, "(cursor=%p)\n", c);
- if (!c->dwarf.ip)
- {
- /* This can happen easily when the frame-chain gets truncated
- due to bad or missing unwind-info. */
- Debug (1, "refusing to resume execution at address 0\n");
- return -UNW_EINVAL;
- }
- establish_machine_state (c);
- return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
- c->dwarf.as_arg);
- }
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