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ARC: DWARF2 .debug_frame based stack unwinder
-Originally written by Rajeshwar Ranga -Derived off of generic unwinder in 2.6.19 and adapted to ARC Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>
This commit is contained in:
Vineet Gupta
parent
41195d236e
commit
854a0d9505
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@ -25,6 +25,7 @@ config ARC
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select HAVE_ARCH_TRACEHOOK
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select HAVE_GENERIC_HARDIRQS
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select HAVE_MEMBLOCK
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select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
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select HAVE_OPROFILE
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select IRQ_DOMAIN
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select MODULES_USE_ELF_RELA
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@ -344,6 +345,20 @@ menuconfig ARC_DBG
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bool "ARC debugging"
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default y
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config ARC_DW2_UNWIND
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bool "Enable DWARF specific kernel stack unwind"
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depends on ARC_DBG
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default y
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select KALLSYMS
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help
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Compiles the kernel with DWARF unwind information and can be used
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to get stack backtraces.
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If you say Y here the resulting kernel image will be slightly larger
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but not slower, and it will give very useful debugging information.
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If you don't debug the kernel, you can say N, but we may not be able
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to solve problems without frame unwind information
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config ARC_DBG_TLB_PARANOIA
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bool "Paranoia Checks in Low Level TLB Handlers"
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depends on ARC_DBG && !SMP
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@ -14,6 +14,13 @@
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#include <asm-generic/module.h>
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#ifdef CONFIG_ARC_DW2_UNWIND
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struct mod_arch_specific {
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void *unw_info;
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int unw_sec_idx;
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};
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#endif
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#define MODULE_PROC_FAMILY "ARC700"
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#define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY
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163
arch/arc/include/asm/unwind.h
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163
arch/arc/include/asm/unwind.h
Normal file
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@ -0,0 +1,163 @@
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_ARC_UNWIND_H
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#define _ASM_ARC_UNWIND_H
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#ifdef CONFIG_ARC_DW2_UNWIND
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#include <linux/sched.h>
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struct arc700_regs {
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unsigned long r0;
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unsigned long r1;
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unsigned long r2;
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unsigned long r3;
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unsigned long r4;
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unsigned long r5;
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unsigned long r6;
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unsigned long r7;
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unsigned long r8;
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long r16;
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unsigned long r17;
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unsigned long r18;
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unsigned long r19;
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unsigned long r20;
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unsigned long r21;
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unsigned long r22;
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unsigned long r23;
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unsigned long r24;
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unsigned long r25;
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unsigned long r26;
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unsigned long r27; /* fp */
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unsigned long r28; /* sp */
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unsigned long r29;
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unsigned long r30;
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unsigned long r31; /* blink */
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unsigned long r63; /* pc */
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};
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struct unwind_frame_info {
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struct arc700_regs regs;
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struct task_struct *task;
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unsigned call_frame:1;
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};
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#define UNW_PC(frame) ((frame)->regs.r63)
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#define UNW_SP(frame) ((frame)->regs.r28)
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#define UNW_BLINK(frame) ((frame)->regs.r31)
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/* Rajesh FIXME */
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#ifdef CONFIG_FRAME_POINTER
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#define UNW_FP(frame) ((frame)->regs.r27)
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#define FRAME_RETADDR_OFFSET 4
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#define FRAME_LINK_OFFSET 0
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#define STACK_BOTTOM_UNW(tsk) STACK_LIMIT((tsk)->thread.ksp)
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#define STACK_TOP_UNW(tsk) ((tsk)->thread.ksp)
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#else
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#define UNW_FP(frame) ((void)(frame), 0)
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#endif
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#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
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#define UNW_REGISTER_INFO \
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PTREGS_INFO(r0), \
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PTREGS_INFO(r1), \
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PTREGS_INFO(r2), \
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PTREGS_INFO(r3), \
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PTREGS_INFO(r4), \
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PTREGS_INFO(r5), \
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PTREGS_INFO(r6), \
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PTREGS_INFO(r7), \
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PTREGS_INFO(r8), \
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PTREGS_INFO(r9), \
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PTREGS_INFO(r10), \
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PTREGS_INFO(r11), \
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PTREGS_INFO(r12), \
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PTREGS_INFO(r13), \
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PTREGS_INFO(r14), \
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PTREGS_INFO(r15), \
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PTREGS_INFO(r16), \
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PTREGS_INFO(r17), \
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PTREGS_INFO(r18), \
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PTREGS_INFO(r19), \
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PTREGS_INFO(r20), \
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PTREGS_INFO(r21), \
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PTREGS_INFO(r22), \
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PTREGS_INFO(r23), \
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PTREGS_INFO(r24), \
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PTREGS_INFO(r25), \
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PTREGS_INFO(r26), \
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PTREGS_INFO(r27), \
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PTREGS_INFO(r28), \
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PTREGS_INFO(r29), \
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PTREGS_INFO(r30), \
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PTREGS_INFO(r31), \
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PTREGS_INFO(r63)
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#define UNW_DEFAULT_RA(raItem, dataAlign) \
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((raItem).where == Memory && !((raItem).value * (dataAlign) + 4))
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extern int arc_unwind(struct unwind_frame_info *frame);
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extern void arc_unwind_init(void);
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extern void arc_unwind_setup(void);
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extern void *unwind_add_table(struct module *module, const void *table_start,
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unsigned long table_size);
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extern void unwind_remove_table(void *handle, int init_only);
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static inline int
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arch_unwind_init_running(struct unwind_frame_info *info,
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int (*callback) (struct unwind_frame_info *info,
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void *arg),
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void *arg)
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{
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return 0;
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}
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static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
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{
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return 0;
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}
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static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
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{
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return;
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}
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static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
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struct pt_regs *regs)
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{
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return;
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}
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#else
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#define UNW_PC(frame) ((void)(frame), 0)
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#define UNW_SP(frame) ((void)(frame), 0)
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#define UNW_FP(frame) ((void)(frame), 0)
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static inline void arc_unwind_init(void)
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{
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}
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static inline void arc_unwind_setup(void)
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{
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}
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#define unwind_add_table(a, b, c)
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#define unwind_remove_table(a, b)
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#endif /* CONFIG_ARC_DW2_UNWIND */
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#endif /* _ASM_ARC_UNWIND_H */
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@ -14,10 +14,16 @@ obj-y += devtree.o
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obj-$(CONFIG_MODULES) += arcksyms.o module.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_ARC_DW2_UNWIND) += unwind.o
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obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
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CFLAGS_fpu.o += -mdpfp
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ifdef CONFIG_ARC_DW2_UNWIND
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CFLAGS_ctx_sw.o += -fno-omit-frame-pointer
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obj-y += ctx_sw.o
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else
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obj-y += ctx_sw_asm.o
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endif
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extra-y := vmlinux.lds head.o
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@ -815,3 +815,12 @@ ARC_ENTRY sys_clone_wrapper
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b ret_from_system_call
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ARC_EXIT sys_clone_wrapper
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#ifdef CONFIG_ARC_DW2_UNWIND
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; Workaround for bug 94179 (STAR ):
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; Despite -fasynchronous-unwind-tables, linker is not making dwarf2 unwinder
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; section (.debug_frame) as loadable. So we force it here.
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; This also fixes STAR 9000487933 where the prev-workaround (objcopy --setflag)
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; would not work after a clean build due to kernel build system dependencies.
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.section .debug_frame, "wa",@progbits
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#endif
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@ -14,6 +14,7 @@
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <asm/unwind.h>
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static inline void arc_write_me(unsigned short *addr, unsigned long value)
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{
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@ -21,6 +22,42 @@ static inline void arc_write_me(unsigned short *addr, unsigned long value)
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*(addr + 1) = (value & 0xffff);
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}
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/* ARC specific section quirks - before relocation loop in generic loader
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*
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* For dwarf unwinding out of modules, this needs to
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* 1. Ensure the .debug_frame is allocatable (ARC Linker bug: despite
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* -fasynchronous-unwind-tables it doesn't).
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* 2. Since we are iterating thru sec hdr tbl anyways, make a note of
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* the exact section index, for later use.
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*/
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int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
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char *secstr, struct module *mod)
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{
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#ifdef CONFIG_ARC_DW2_UNWIND
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int i;
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mod->arch.unw_sec_idx = 0;
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mod->arch.unw_info = NULL;
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for (i = 1; i < hdr->e_shnum; i++) {
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if (strcmp(secstr+sechdrs[i].sh_name, ".debug_frame") == 0) {
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sechdrs[i].sh_flags |= SHF_ALLOC;
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mod->arch.unw_sec_idx = i;
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break;
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}
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}
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#endif
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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#ifdef CONFIG_ARC_DW2_UNWIND
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if (mod->arch.unw_info)
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unwind_remove_table(mod->arch.unw_info, 0);
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#endif
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}
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int apply_relocate_add(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex, /* sec index for sym tbl */
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@ -85,3 +122,24 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
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return -ENOEXEC;
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}
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/* Just before lift off: After sections have been relocated, we add the
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* dwarf section to unwinder table pool
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* This couldn't be done in module_frob_arch_sections() because
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* relocations had not been applied by then
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*/
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
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struct module *mod)
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{
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#ifdef CONFIG_ARC_DW2_UNWIND
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void *unw;
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int unwsec = mod->arch.unw_sec_idx;
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if (unwsec) {
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unw = unwind_add_table(mod, (void *)sechdrs[unwsec].sh_addr,
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sechdrs[unwsec].sh_size);
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mod->arch.unw_info = unw;
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}
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#endif
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return 0;
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}
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@ -23,6 +23,7 @@
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#include <asm/irq.h>
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#include <asm/arcregs.h>
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#include <asm/prom.h>
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#include <asm/unwind.h>
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#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
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@ -105,6 +106,8 @@ void __init setup_arch(char **cmdline_p)
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conswitchp = &dummy_con;
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#endif
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arc_unwind_init();
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arc_unwind_setup();
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}
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/*
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1329
arch/arc/kernel/unwind.c
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1329
arch/arc/kernel/unwind.c
Normal file
File diff suppressed because it is too large
Load Diff
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@ -100,17 +100,38 @@ SECTIONS
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BSS_SECTION(0, 0, 0)
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#ifdef CONFIG_ARC_DW2_UNWIND
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. = ALIGN(PAGE_SIZE);
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.debug_frame : {
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__start_unwind = .;
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*(.debug_frame)
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__end_unwind = .;
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}
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#else
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/DISCARD/ : { *(.debug_frame) }
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#endif
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NOTES
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. = ALIGN(PAGE_SIZE);
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_end = . ;
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STABS_DEBUG
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DWARF_DEBUG
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DISCARDS
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.arcextmap 0 : {
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*(.gnu.linkonce.arcextmap.*)
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*(.arcextmap.*)
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}
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/* open-coded because we need .debug_frame seperately for unwinding */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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}
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