mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-06-25 19:01:44 +02:00
![Tommi Rantala](/assets/img/avatar_default.png)
Add support for the 32bit SuperH architecture running Linux. Specifically, support is added for SH4, and support for earlier SH versions and to the 64bit SH5 are left out. This was tested in qemu with a little-endian SH4 debian image & GCC 4.7 cross compiler.
166 lines
4.9 KiB
C
166 lines
4.9 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2008 CodeSourcery
|
|
Copyright 2011 Linaro Limited
|
|
Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
|
|
|
|
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
|
|
sh_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 == SH_SCF_NONE)
|
|
{
|
|
/* Since there are no signals involved here we restore the non scratch
|
|
registers only. */
|
|
unsigned long regs[8];
|
|
regs[0] = uc->uc_mcontext.gregs[8];
|
|
regs[1] = uc->uc_mcontext.gregs[9];
|
|
regs[2] = uc->uc_mcontext.gregs[10];
|
|
regs[3] = uc->uc_mcontext.gregs[11];
|
|
regs[4] = uc->uc_mcontext.gregs[12];
|
|
regs[5] = uc->uc_mcontext.gregs[13];
|
|
regs[6] = uc->uc_mcontext.gregs[14];
|
|
regs[7] = uc->uc_mcontext.gregs[15];
|
|
unsigned long pc = uc->uc_mcontext.pr;
|
|
|
|
struct regs_overlay {
|
|
char x[sizeof(regs)];
|
|
};
|
|
|
|
asm volatile (
|
|
"mov.l @%0+, r8\n"
|
|
"mov.l @%0+, r9\n"
|
|
"mov.l @%0+, r10\n"
|
|
"mov.l @%0+, r11\n"
|
|
"mov.l @%0+, r12\n"
|
|
"mov.l @%0+, r13\n"
|
|
"mov.l @%0+, r14\n"
|
|
"mov.l @%0, r15\n"
|
|
"lds %1, pr\n"
|
|
"rts\n"
|
|
"nop\n"
|
|
:
|
|
: "r" (regs),
|
|
"r" (pc),
|
|
"m" (*(struct regs_overlay *)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->sc_regs[0] = uc->uc_mcontext.gregs[0];
|
|
sc->sc_regs[1] = uc->uc_mcontext.gregs[1];
|
|
sc->sc_regs[2] = uc->uc_mcontext.gregs[2];
|
|
sc->sc_regs[3] = uc->uc_mcontext.gregs[3];
|
|
sc->sc_regs[4] = uc->uc_mcontext.gregs[4];
|
|
sc->sc_regs[5] = uc->uc_mcontext.gregs[5];
|
|
sc->sc_regs[6] = uc->uc_mcontext.gregs[6];
|
|
sc->sc_regs[7] = uc->uc_mcontext.gregs[7];
|
|
sc->sc_regs[8] = uc->uc_mcontext.gregs[8];
|
|
sc->sc_regs[9] = uc->uc_mcontext.gregs[9];
|
|
sc->sc_regs[10] = uc->uc_mcontext.gregs[10];
|
|
sc->sc_regs[11] = uc->uc_mcontext.gregs[11];
|
|
sc->sc_regs[12] = uc->uc_mcontext.gregs[12];
|
|
sc->sc_regs[13] = uc->uc_mcontext.gregs[13];
|
|
sc->sc_regs[14] = uc->uc_mcontext.gregs[14];
|
|
sc->sc_regs[15] = uc->uc_mcontext.gregs[15];
|
|
sc->sc_pc = uc->uc_mcontext.pc;
|
|
sc->sc_pr = uc->uc_mcontext.pr;
|
|
|
|
/* 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 %0, r15\n"
|
|
"lds %1, pr\n"
|
|
"rts\n"
|
|
"nop\n"
|
|
:
|
|
: "r" (c->sigcontext_sp),
|
|
"r" (c->sigcontext_pc)
|
|
);
|
|
}
|
|
__builtin_unreachable();
|
|
#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);
|
|
}
|