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/* DWARF2 EH unwinding support for SPARC Linux.
Copyright 2004, 2005, 2009 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
/* Handle multilib correctly. */
#if defined(__arch64__)
/* 64-bit SPARC version */
#define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
static _Unwind_Reason_Code
sparc64_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
unsigned int *pc = context->ra;
long new_cfa, i;
long regs_off, fpu_save_off;
long this_cfa, fpu_save;
if (pc[0] != 0x82102065 /* mov NR_rt_sigreturn, %g1 */
|| pc[1] != 0x91d0206d) /* ta 0x6d */
return _URC_END_OF_STACK;
regs_off = 192 + 128;
fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4);
this_cfa = (long) context->cfa;
new_cfa = *(long *)((context->cfa) + (regs_off + (14 * 8)));
new_cfa += 2047; /* Stack bias */
fpu_save = *(long *)((this_cfa) + (fpu_save_off));
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 14;
fs->regs.cfa_offset = new_cfa - (long) context->cfa;
for (i = 1; i < 16; ++i)
{
fs->regs.reg[i].how = REG_SAVED_OFFSET;
fs->regs.reg[i].loc.offset =
this_cfa + (regs_off + (i * 8)) - new_cfa;
}
for (i = 0; i < 16; ++i)
{
fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
fs->regs.reg[i + 16].loc.offset =
this_cfa + (i * 8) - new_cfa;
}
if (fpu_save)
{
for (i = 0; i < 64; ++i)
{
if (i > 32 && (i & 0x1))
continue;
fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
fs->regs.reg[i + 32].loc.offset =
(fpu_save + (i * 4)) - new_cfa;
}
}
/* Stick return address into %g0, same trick Alpha uses. */
fs->regs.reg[0].how = REG_SAVED_OFFSET;
fs->regs.reg[0].loc.offset =
this_cfa + (regs_off + (16 * 8) + 8) - new_cfa;
fs->retaddr_column = 0;
return _URC_NO_REASON;
}
#else
/* 32-bit SPARC version */
#define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state
static _Unwind_Reason_Code
sparc_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
unsigned int *pc = context->ra;
int new_cfa, i, oldstyle;
int regs_off, fpu_save_off;
int fpu_save, this_cfa;
if (pc[1] != 0x91d02010) /* ta 0x10 */
return _URC_END_OF_STACK;
if (pc[0] == 0x821020d8) /* mov NR_sigreturn, %g1 */
oldstyle = 1;
else if (pc[0] == 0x82102065) /* mov NR_rt_sigreturn, %g1 */
oldstyle = 0;
else
return _URC_END_OF_STACK;
if (oldstyle)
{
regs_off = 96;
fpu_save_off = regs_off + (4 * 4) + (16 * 4);
}
else
{
regs_off = 96 + 128;
fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4);
}
this_cfa = (int) context->cfa;
new_cfa = *(int *)((context->cfa) + (regs_off+(4*4)+(14 * 4)));
fpu_save = *(int *)((this_cfa) + (fpu_save_off));
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 14;
fs->regs.cfa_offset = new_cfa - (int) context->cfa;
for (i = 1; i < 16; ++i)
{
if (i == 14)
continue;
fs->regs.reg[i].how = REG_SAVED_OFFSET;
fs->regs.reg[i].loc.offset =
this_cfa + (regs_off+(4 * 4)+(i * 4)) - new_cfa;
}
for (i = 0; i < 16; ++i)
{
fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
fs->regs.reg[i + 16].loc.offset =
this_cfa + (i * 4) - new_cfa;
}
if (fpu_save)
{
for (i = 0; i < 32; ++i)
{
fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
fs->regs.reg[i + 32].loc.offset =
(fpu_save + (i * 4)) - new_cfa;
}
}
/* Stick return address into %g0, same trick Alpha uses. */
fs->regs.reg[0].how = REG_SAVED_OFFSET;
fs->regs.reg[0].loc.offset = this_cfa+(regs_off+4)-new_cfa;
fs->retaddr_column = 0;
return _URC_NO_REASON;
}
#endif
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