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gcc: fix xtensa_fallback_frame_state for call0 ABI

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This allows for stack unwinding over signal frames on xtensa linux with
call0 ABI.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2016-11-22 15:06:51 -08:00
parent 6c6829a061
commit fe3cca91d2
1 changed files with 108 additions and 0 deletions
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108
patches/gcc/5.4.0/875-xtensa-fix-xtensa_fallback_frame_state-for-call0-ABI.patch Normal file
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@ -0,0 +1,108 @@
From 7d3692c6933f7ff87bf110dede8e33e922b164c6 Mon Sep 17 00:00:00 2001
From: jcmvbkbc <jcmvbkbc@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 15 Sep 2015 19:30:32 +0000
Subject: [PATCH] xtensa: fix xtensa_fallback_frame_state for call0 ABI
2015-09-15 Max Filippov <jcmvbkbc@gmail.com>
gcc/
* config/xtensa/xtensa.h (DWARF_ALT_FRAME_RETURN_COLUMN): New
definition.
(DWARF_FRAME_REGISTERS): Reserve space for one extra register in
call0 ABI.
libgcc/
* config/xtensa/linux-unwind.h (xtensa_fallback_frame_state):
Add support for call0 ABI.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227809 138bc75d-0d04-0410-961f-82ee72b054a4
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
gcc/config/xtensa/xtensa.h | 4 +++-
libgcc/config/xtensa/linux-unwind.h | 30 ++++++++++++++++++++++++++++--
2 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/gcc/config/xtensa/xtensa.h b/gcc/config/xtensa/xtensa.h
index 584080b..e165def 100644
--- a/gcc/config/xtensa/xtensa.h
+++ b/gcc/config/xtensa/xtensa.h
@@ -813,7 +813,9 @@ typedef struct xtensa_args
for debugging. */
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 0)
#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (0)
-#define DWARF_FRAME_REGISTERS 16
+#define DWARF_ALT_FRAME_RETURN_COLUMN 16
+#define DWARF_FRAME_REGISTERS (DWARF_ALT_FRAME_RETURN_COLUMN \
+ + (TARGET_WINDOWED_ABI ? 0 : 1))
#define EH_RETURN_DATA_REGNO(N) ((N) < 2 ? (N) + 2 : INVALID_REGNUM)
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
(flag_pic \
diff --git a/libgcc/config/xtensa/linux-unwind.h b/libgcc/config/xtensa/linux-unwind.h
index 9daf738..9a67b5d 100644
--- a/libgcc/config/xtensa/linux-unwind.h
+++ b/libgcc/config/xtensa/linux-unwind.h
@@ -52,7 +52,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define ENTRY_BYTE 0x36
#endif
-#ifdef __XTENSA_WINDOWED_ABI__
#define MD_FALLBACK_FRAME_STATE_FOR xtensa_fallback_frame_state
static _Unwind_Reason_Code
@@ -61,6 +60,10 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
{
unsigned char *pc = context->ra;
struct sigcontext *sc;
+#if defined(__XTENSA_CALL0_ABI__)
+ _Unwind_Ptr new_cfa;
+ int i;
+#endif
struct rt_sigframe {
siginfo_t info;
@@ -76,6 +79,7 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
|| pc[5] != SYSC_BYTE2)
return _URC_END_OF_STACK;
+#if defined(__XTENSA_WINDOWED_ABI__)
rt_ = context->sp;
sc = &rt_->uc.uc_mcontext;
fs->signal_regs = (_Unwind_Word *) sc->sc_a;
@@ -90,11 +94,33 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
}
else
fs->signal_ra = sc->sc_pc;
+#elif defined(__XTENSA_CALL0_ABI__)
+ rt_ = context->cfa;
+ sc = &rt_->uc.uc_mcontext;
+
+ 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;
+
+ for (i = 0; i < 16; i++)
+ {
+ fs->regs.reg[i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[i].loc.offset = (_Unwind_Ptr) &(sc->sc_a[i]) - new_cfa;
+ }
+
+ fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].how =
+ REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].loc.offset =
+ (_Unwind_Ptr) (sc->sc_pc) - new_cfa;
+ fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
+#else
+#error Unsupported Xtensa ABI
+#endif
fs->signal_frame = 1;
return _URC_NO_REASON;
}
-#endif /* __XTENSA_WINDOWED_ABI__ */
#endif /* ifdef inhibit_libc */
--
2.1.4