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[ARC] Fix to unwinding.

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gcc/ChangeLog:
2017-11-03  Cupertino Miranda  <cmiranda@synopsys.com>

        * config/arc/arc.c (arc_save_restore): Corrected CFA note.
        (arc_expand_prologue): Restore blink for millicode.
        * config/arc/linux.h (LINK_EH_SPEC): Defined.

libgcc/ChangeLog:
2017-11-03  Cupertino Miranda  <cmiranda@synopsys.com>
            Vineet Gupta <vgupta@synopsys.com>

        * config.host (arc*-*-linux*): Set md_unwind_header variable.
        * config/arc/linux-unwind-reg.def: New file.
        * config/arc/linux-unwind.h: Likewise.

Co-Authored-By: Vineet Gupta <vgupta@synopsys.com>

From-SVN: r254367
This commit is contained in:
Cupertino Miranda 2017-11-03 10:51:18 +00:00 committed by Claudiu Zissulescu
parent a34a16abe5
commit b0c7ddf816
7 changed files with 247 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-11-03 Cupertino Miranda <cmiranda@synopsys.com>
* config/arc/arc.c (arc_save_restore): Corrected CFA note.
(arc_expand_prologue): Restore blink for millicode.
* config/arc/linux.h (LINK_EH_SPEC): Defined.
2017-11-03 Richard Sandiford <richard.sandiford@linaro.org>
PR target/82809

36
gcc/config/arc/arc.c
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@ -2823,12 +2823,23 @@ arc_save_restore (rtx base_reg,
else
{
insn = frame_insn (insn);
if (epilogue_p)
for (r = start_call; r <= end_call; r++)
{
rtx reg = gen_rtx_REG (SImode, r);
add_reg_note (insn, REG_CFA_RESTORE, reg);
}
for (r = start_call, off = 0;
r <= end_call;
r++, off += UNITS_PER_WORD)
{
rtx reg = gen_rtx_REG (SImode, r);
if (epilogue_p)
add_reg_note (insn, REG_CFA_RESTORE, reg);
else
{
rtx mem = gen_rtx_MEM (SImode, plus_constant (Pmode,
base_reg,
off));
add_reg_note (insn, REG_CFA_OFFSET,
gen_rtx_SET (mem, reg));
}
}
}
offset += off;
}
@ -3070,6 +3081,19 @@ arc_expand_prologue (void)
frame_size_to_allocate -= cfun->machine->frame_info.reg_size;
}
/* In the case of millicode thunk, we need to restore the clobbered
blink register. */
if (cfun->machine->frame_info.millicode_end_reg > 0
&& arc_must_save_return_addr (cfun))
{
HOST_WIDE_INT tmp = cfun->machine->frame_info.reg_size;
emit_insn (gen_rtx_SET (gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM),
gen_rtx_MEM (Pmode,
plus_constant (Pmode,
stack_pointer_rtx,
tmp))));
}
/* Save frame pointer if needed. First save the FP on stack, if not
autosaved. */
if (arc_frame_pointer_needed ()

8
gcc/config/arc/linux.h
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@ -91,3 +91,11 @@ along with GCC; see the file COPYING3. If not see
/* Pre/post modify with register displacement are default off. */
#undef TARGET_AUTO_MODIFY_REG_DEFAULT
#define TARGET_AUTO_MODIFY_REG_DEFAULT 0
#if DEFAULT_LIBC == LIBC_GLIBC
/* Override linux.h LINK_EH_SPEC definition.
Signalize that because we have fde-glibc, we don't need all C shared libs
linked against -lgcc_s. */
#undef LINK_EH_SPEC
#define LINK_EH_SPEC "--eh-frame-hdr"
#endif

7
libgcc/ChangeLog
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@ -1,3 +1,10 @@
2017-11-03 Cupertino Miranda <cmiranda@synopsys.com>
Vineet Gupta <vgupta@synopsys.com>
* config.host (arc*-*-linux*): Set md_unwind_header variable.
* config/arc/linux-unwind-reg.def: New file.
* config/arc/linux-unwind-reg.h: Likewise.
2017-10-23 Sebastian Perta <sebastian.perta@renesas.com>
* config/rl78/subdi3.S: New assembly file.

1
libgcc/config.host
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@ -390,6 +390,7 @@ arc*-*-linux*)
tmake_file="${tmake_file} t-slibgcc-libgcc t-slibgcc-nolc-override arc/t-arc-uClibc arc/t-arc"
extra_parts="$extra_parts crti.o crtn.o"
extra_parts="$extra_parts crttls.o"
md_unwind_header=arc/linux-unwind.h
;;
arm-wrs-vxworks|arm-wrs-vxworks7)
tmake_file="$tmake_file arm/t-arm arm/t-elf t-softfp-sfdf t-softfp-excl arm/t-softfp t-softfp"

42
libgcc/config/arc/linux-unwind-reg.def Normal file
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@ -0,0 +1,42 @@
/* Copyright (C) 2017 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.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>.
*/
REGISTER_IN_STACK(bta, -1)
REGISTER_IN_STACK(lp_start, -1)
REGISTER_IN_STACK(lp_end, -1)
REGISTER_IN_STACK(lp_count, -1)
REGISTER_IN_STACK(status32, -1)
REGISTER_IN_STACK(ret, -1)
REGISTER_IN_STACK(blink, 31)
REGISTER_IN_STACK(fp, 27)
REGISTER_IN_STACK(gp, 26)
REGISTER_IN_STACK(r12, 12)
REGISTER_IN_STACK(r11, 11)
REGISTER_IN_STACK(r10, 10)
REGISTER_IN_STACK(r9, 9)
REGISTER_IN_STACK(r8, 8)
REGISTER_IN_STACK(r7, 7)
REGISTER_IN_STACK(r6, 6)
REGISTER_IN_STACK(r5, 5)
REGISTER_IN_STACK(r4, 4)
REGISTER_IN_STACK(r3, 3)
REGISTER_IN_STACK(r2, 2)
REGISTER_IN_STACK(r1, 1)
REGISTER_IN_STACK(r0, 0)
REGISTER_IN_STACK(sp, 28)

153
libgcc/config/arc/linux-unwind.h Normal file
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@ -0,0 +1,153 @@
/* DWARF2 EH unwinding support for ARC Linux.
Copyright (C) 2017 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/>. */
/* This order is defined by a structure in the kernel, in file
arch/arc/kernel/signal.c. */
#define REGISTER_IN_STACK(REG_NAME, ID) \
REG_NAME,
enum registers_stack_order {
REGISTER_STACK_ORDER_START = -1,
#include "config/arc/linux-unwind-reg.def"
REGISTER_STACK_ORDER_SIZE,
};
struct register_position {
int reg_id;
int offset_in_stack;
};
#undef REGISTER_IN_STACK
#define REGISTER_SIZE_IN_WORDS 4
#define REGISTER_IN_STACK(REG_NAME, ID) (int) ID,
int
register_id_for_index[REGISTER_STACK_ORDER_SIZE] = {
#include "config/arc/linux-unwind-reg.def"
};
#undef REGISTER_IN_STACK
#ifndef inhibit_libc
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
#include <signal.h>
#include <asm/unistd.h>
/*
00010edc <__default_rt_sa_restorer>:
10edc: 208a 12c2 mov r8,139
10ee0: 781e trap_s 0
10ee2: 7ee0 j_s [blink]
*/
#if __BIG_ENDIAN__
#define MOV_R8_139 0x8a20c212
#define TRAP_S_J_S_BLINK 0x1e78e07e
#define SWI 0x6f223f00
#elif __LITTLE_ENDIAN__
#define MOV_R8_139 0x12c2208a
#define TRAP_S_J_S_BLINK 0x7ee0781e
#define SWI 0x003f226f
#endif
#define MD_FALLBACK_FRAME_STATE_FOR arc_fallback_frame_state
static __attribute__((noinline)) _Unwind_Reason_Code
arc_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
struct rt_sigframe {
siginfo_t info;
ucontext_t uc;
unsigned int sigret_magic;
};
struct rt_sigframe *rt_;
u_int32_t *pc = (u_int32_t *) context->ra;
struct sigcontext *sc;
_Unwind_Ptr new_cfa;
int i;
#ifdef __ARC700__
if (pc[1] != SWI)
return _URC_END_OF_STACK;
#else
if (pc[1] != TRAP_S_J_S_BLINK)
return _URC_END_OF_STACK;
#endif
if (pc[0] == MOV_R8_139)
{
rt_ = context->cfa;
sc = &rt_->uc.uc_mcontext;
}
else
return _URC_END_OF_STACK;
new_cfa = (_Unwind_Ptr) sc;
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
unsigned long *regs = &sc->regs.scratch.bta;
for (i = 0; i < REGISTER_STACK_ORDER_SIZE; i++)
{
if (register_id_for_index[i] == -1)
continue;
fs->regs.reg[register_id_for_index[i]].how = REG_SAVED_OFFSET;
fs->regs.reg[register_id_for_index[i]].loc.offset
= ((_Unwind_Ptr) &(regs[i])) - new_cfa;
}
fs->regs.reg[31].how = REG_SAVED_VAL_OFFSET;
fs->regs.reg[31].loc.offset = ((_Unwind_Ptr) (regs[ret])) - new_cfa;
fs->retaddr_column = 31;
return _URC_NO_REASON;
}
#endif
#define MD_FROB_UPDATE_CONTEXT arc_frob_update_context
/* Save fp register for unwinding to work. */
static void
arc_frob_update_context (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
_Unwind_Word fp_val;
asm ("mov %0,fp" : "=r" (fp_val));
switch (fs->regs.reg[27].how)
{
case REG_UNSAVED:
case REG_UNDEFINED:
if (context->reg[27] == NULL)
_Unwind_SetGRValue (context, 27, fp_val);
break;
default:
break;
}
}