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From f2acb06970522a9563d82490f2f1b8fc0bb5b720 Mon Sep 17 00:00:00 2001
From: Ying Huang <ying.huang@oss.cipunited.com>
Date: Tue, 5 Mar 2024 17:51:21 +0800
Subject: [PATCH] stack: Fix stack unwind failure on mips
Add abi_cfi, set_initial_registers_tid, unwind on mips.
* backends/Makefile.am (mips_SRCS): Add mips_initreg.c,
mips_cfi.c and mips_unwind.c.
* backends/mips_init.c (mips_init): HOOK abi_cfi, unwind and
set_initial_registers_tid. Set frame_nregs to 71.
* backends/mips_cfi.c: New file.
* backends/mips_initreg.c: Likewise.
* backends/mips_unwind.c: Likewise.
Signed-off-by: Ying Huang <ying.huang@oss.cipunited.com>
---
backends/Makefile.am | 3 +-
backends/mips_cfi.c | 68 +++++++++++++++++++++++++++++++++
backends/mips_init.c | 4 ++
backends/mips_initreg.c | 61 ++++++++++++++++++++++++++++++
backends/mips_unwind.c | 84 +++++++++++++++++++++++++++++++++++++++++
5 files changed, 219 insertions(+), 1 deletion(-)
create mode 100644 backends/mips_cfi.c
create mode 100644 backends/mips_initreg.c
create mode 100644 backends/mips_unwind.c
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -102,7 +102,8 @@ loongarch_SRCS = loongarch_init.c loonga
arc_SRCS = arc_init.c arc_symbol.c
-mips_SRCS = mips_init.c mips_symbol.c mips_attrs.c
+mips_SRCS = mips_init.c mips_symbol.c mips_attrs.c mips_initreg.c \
+ mips_cfi.c mips_unwind.c
libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
$(ia64_SRCS) $(alpha_SRCS) $(arm_SRCS) \
--- /dev/null
+++ b/backends/mips_cfi.c
@@ -0,0 +1,68 @@
+/* MIPS ABI-specified defaults for DWARF CFI.
+ Copyright (C) 2009 Red Hat, Inc.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+
+int
+mips_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
+{
+ static const uint8_t abi_cfi[] =
+ {
+ DW_CFA_def_cfa, ULEB128_7 (31), ULEB128_7 (0),
+ /* Callee-saved regs. */
+ DW_CFA_same_value, ULEB128_7 (16), /* s0 */
+ DW_CFA_same_value, ULEB128_7 (17), /* s1 */
+ DW_CFA_same_value, ULEB128_7 (18), /* s2 */
+ DW_CFA_same_value, ULEB128_7 (19), /* s3 */
+ DW_CFA_same_value, ULEB128_7 (20), /* s4 */
+ DW_CFA_same_value, ULEB128_7 (21), /* s5 */
+ DW_CFA_same_value, ULEB128_7 (22), /* s6 */
+ DW_CFA_same_value, ULEB128_7 (23), /* s7 */
+ DW_CFA_same_value, ULEB128_7 (28), /* gp */
+ DW_CFA_same_value, ULEB128_7 (29), /* sp */
+ DW_CFA_same_value, ULEB128_7 (30), /* fp */
+
+ DW_CFA_val_offset, ULEB128_7 (29), ULEB128_7 (0),
+ };
+
+ abi_info->initial_instructions = abi_cfi;
+ abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
+ abi_info->data_alignment_factor = 8;
+
+ abi_info->return_address_register = 31; /* %ra */
+
+ return 0;
+}
--- a/backends/mips_init.c
+++ b/backends/mips_init.c
@@ -58,5 +58,9 @@ mips_init (Elf *elf __attribute__ ((unus
HOOK (eh, check_object_attribute);
HOOK (eh, check_special_symbol);
HOOK (eh, check_reloc_target_type);
+ HOOK (eh, set_initial_registers_tid);
+ HOOK (eh, abi_cfi);
+ HOOK (eh, unwind);
+ eh->frame_nregs = 71;
return eh;
}
--- /dev/null
+++ b/backends/mips_initreg.c
@@ -0,0 +1,61 @@
+/* Fetch live process registers from TID.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#if (defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)) && defined(__linux__)
+# include <sys/user.h>
+# include <sys/ptrace.h>
+#include <asm/ptrace.h>
+#endif
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+
+
+bool
+mips_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
+ ebl_tid_registers_t *setfunc __attribute__ ((unused)),
+ void *arg __attribute__ ((unused)))
+{
+#if (!defined(mips) && !defined(__mips) && !defined(__mips__) && !defined(MIPS) && !defined(__MIPS__)) || !defined(__linux__)
+ return false;
+#else /* __mips__ */
+/* For PTRACE_GETREGS */
+
+ struct pt_regs gregs;
+ if (ptrace (PTRACE_GETREGS, tid, 0, &gregs) != 0)
+ return false;
+ if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.cp0_epc, arg))
+ return false;
+ return setfunc (0, 32, (Dwarf_Word *) &gregs.regs[0], arg);
+#endif /* __mips__ */
+}
--- /dev/null
+++ b/backends/mips_unwind.c
@@ -0,0 +1,84 @@
+/* Get previous frame state for an existing frame state.
+ Copyright (C) 2016 The Qt Company Ltd.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define BACKEND mips_
+#define SP_REG 29
+#define FP_REG 30
+#define LR_REG 31
+#define FP_OFFSET 0
+#define LR_OFFSET 8
+#define SP_OFFSET 16
+
+#include "libebl_CPU.h"
+
+/* There was no CFI. Maybe we happen to have a frame pointer and can unwind from that? */
+
+bool
+EBLHOOK(unwind) (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr pc __attribute__ ((unused)),
+ ebl_tid_registers_t *setfunc, ebl_tid_registers_get_t *getfunc,
+ ebl_pid_memory_read_t *readfunc, void *arg,
+ bool *signal_framep __attribute__ ((unused)))
+{
+ Dwarf_Word fp, lr, sp;
+
+ if (!getfunc(LR_REG, 1, &lr, arg))
+ return false;
+
+ if (lr == 0 || !setfunc(-1, 1, &lr, arg))
+ return false;
+
+ if (!getfunc(FP_REG, 1, &fp, arg))
+ fp = 0;
+
+ if (!getfunc(SP_REG, 1, &sp, arg))
+ sp = 0;
+
+ Dwarf_Word newLr, newFp, newSp;
+
+ if (!readfunc(fp + LR_OFFSET, &newLr, arg))
+ newLr = 0;
+
+ if (!readfunc(fp + FP_OFFSET, &newFp, arg))
+ newFp = 0;
+
+ newSp = fp + SP_OFFSET;
+
+ // These are not fatal if they don't work. They will just prevent unwinding at the next frame.
+ setfunc(LR_REG, 1, &newLr, arg);
+ setfunc(FP_REG, 1, &newFp, arg);
+ setfunc(SP_REG, 1, &newSp, arg);
+
+ // If the fp is invalid, we might still have a valid lr.
+ // But if the fp is valid, then the stack should be moving in the right direction.
+ return fp == 0 || newSp > sp;
+}
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