From afbfb52e47273a440df33274452c603e8c332de2 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Mon, 4 Dec 2006 18:17:28 +0900 Subject: sh: stacktrace/lockdep/irqflags tracing support. Wire up all of the essentials for lockdep.. Signed-off-by: Paul Mundt --- arch/sh/Kconfig | 8 ++++++ arch/sh/Kconfig.debug | 4 +++ arch/sh/kernel/Makefile | 1 + arch/sh/kernel/cpu/sh2/entry.S | 16 +++++++++++ arch/sh/kernel/cpu/sh3/entry.S | 2 +- arch/sh/kernel/entry-common.S | 64 +++++++++++++++++++++++++++++++++++++++++- arch/sh/kernel/stacktrace.c | 43 ++++++++++++++++++++++++++++ arch/sh/mm/fault.c | 3 ++ 8 files changed, 139 insertions(+), 2 deletions(-) create mode 100644 arch/sh/kernel/stacktrace.c (limited to 'arch/sh') diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index aa1ebc561b84..013732074d35 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -51,6 +51,14 @@ config GENERIC_TIME config ARCH_MAY_HAVE_PC_FDC bool +config STACKTRACE_SUPPORT + bool + default y + +config LOCKDEP_SUPPORT + bool + default y + source "init/Kconfig" menu "System type" diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug index dcceec95a2d5..66a25ef4ef1b 100644 --- a/arch/sh/Kconfig.debug +++ b/arch/sh/Kconfig.debug @@ -1,5 +1,9 @@ menu "Kernel hacking" +config TRACE_IRQFLAGS_SUPPORT + bool + default y + source "lib/Kconfig.debug" config SH_STANDARD_BIOS diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile index 50d54c24d76a..99c7e5249f7a 100644 --- a/arch/sh/kernel/Makefile +++ b/arch/sh/kernel/Makefile @@ -21,3 +21,4 @@ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_APM) += apm.o obj-$(CONFIG_PM) += pm.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o diff --git a/arch/sh/kernel/cpu/sh2/entry.S b/arch/sh/kernel/cpu/sh2/entry.S index 298d9191909d..34d51b3745ea 100644 --- a/arch/sh/kernel/cpu/sh2/entry.S +++ b/arch/sh/kernel/cpu/sh2/entry.S @@ -184,6 +184,11 @@ trap_entry: add r15,r8 mov.l r9,@r8 mov r9,r8 +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 5f, r9 + jsr @r9 + nop +#endif sti bra system_call nop @@ -193,6 +198,9 @@ trap_entry: 2: .long break_point_trap_software 3: .long NR_syscalls 4: .long sys_call_table +#ifdef CONFIG_TRACE_IRQFLAGS +5: .long trace_hardirqs_on +#endif #if defined(CONFIG_SH_STANDARD_BIOS) /* Unwind the stack and jmp to the debug entry */ @@ -255,6 +263,11 @@ ENTRY(address_error_handler) restore_all: cli +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 3f, r0 + jsr @r0 + nop +#endif mov r15,r0 mov.l $cpu_mode,r2 mov #OFF_SR,r3 @@ -307,6 +320,9 @@ $current_thread_info: .long __current_thread_info $cpu_mode: .long __cpu_mode +#ifdef CONFIG_TRACE_IRQFLAGS +3: .long trace_hardirqs_off +#endif ! common exception handler #include "../../entry-common.S" diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S index 7ba3dcbe7504..8c0dc2700c69 100644 --- a/arch/sh/kernel/cpu/sh3/entry.S +++ b/arch/sh/kernel/cpu/sh3/entry.S @@ -140,7 +140,7 @@ call_dpf: mov.l 1f, r0 mov.l @r0, r6 ! address mov.l 3f, r0 - sti + jmp @r0 mov r15, r4 ! regs diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index 8f96d21fcb1c..29136a35d7c7 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -100,6 +100,11 @@ debug_trap: .align 2 ENTRY(exception_error) ! +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 3f, r0 + jsr @r0 + nop +#endif sti mov.l 2f, r0 jmp @r0 @@ -109,10 +114,18 @@ ENTRY(exception_error) .align 2 1: .long break_point_trap_software 2: .long do_exception_error +#ifdef CONFIG_TRACE_IRQFLAGS +3: .long trace_hardirqs_on +#endif .align 2 ret_from_exception: preempt_stop() +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 4f, r0 + jsr @r0 + nop +#endif ENTRY(ret_from_irq) ! mov #OFF_SR, r0 @@ -143,6 +156,11 @@ need_resched: mov.l 1f, r0 mov.l r0, @(TI_PRE_COUNT,r8) +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 3f, r0 + jsr @r0 + nop +#endif sti mov.l 2f, r0 jsr @r0 @@ -150,9 +168,15 @@ need_resched: mov #0, r0 mov.l r0, @(TI_PRE_COUNT,r8) cli +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 4f, r0 + jsr @r0 + nop +#endif bra need_resched nop + noresched: bra __restore_all nop @@ -160,11 +184,20 @@ noresched: .align 2 1: .long PREEMPT_ACTIVE 2: .long schedule +#ifdef CONFIG_TRACE_IRQFLAGS +3: .long trace_hardirqs_on +4: .long trace_hardirqs_off +#endif #endif ENTRY(resume_userspace) ! r8: current_thread_info cli +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 5f, r0 + jsr @r0 + nop +#endif mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags tst #_TIF_WORK_MASK, r0 bt/s __restore_all @@ -210,6 +243,11 @@ work_resched: jsr @r1 ! schedule nop cli +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 5f, r0 + jsr @r0 + nop +#endif ! mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags tst #_TIF_WORK_MASK, r0 @@ -221,6 +259,10 @@ work_resched: 1: .long schedule 2: .long do_notify_resume 3: .long restore_all +#ifdef CONFIG_TRACE_IRQFLAGS +4: .long trace_hardirqs_on +5: .long trace_hardirqs_off +#endif .align 2 syscall_exit_work: @@ -229,6 +271,11 @@ syscall_exit_work: tst #_TIF_SYSCALL_TRACE, r0 bt/s work_pending tst #_TIF_NEED_RESCHED, r0 +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 5f, r0 + jsr @r0 + nop +#endif sti ! XXX setup arguments... mov.l 4f, r0 ! do_syscall_trace @@ -265,7 +312,7 @@ syscall_trace_entry: mov.l r0, @(OFF_R0,r15) ! Return value __restore_all: - mov.l 1f,r0 + mov.l 1f, r0 jmp @r0 nop @@ -331,7 +378,13 @@ ENTRY(system_call) mov #OFF_TRA, r9 add r15, r9 mov.l r8, @r9 ! set TRA value to tra +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 5f, r10 + jsr @r10 + nop +#endif sti + ! get_current_thread_info r8, r10 mov.l @(TI_FLAGS,r8), r8 @@ -355,6 +408,11 @@ syscall_call: ! syscall_exit: cli +#ifdef CONFIG_TRACE_IRQFLAGS + mov.l 6f, r0 + jsr @r0 + nop +#endif ! get_current_thread_info r8, r0 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags @@ -369,3 +427,7 @@ syscall_exit: 2: .long NR_syscalls 3: .long sys_call_table 4: .long do_syscall_trace +#ifdef CONFIG_TRACE_IRQFLAGS +5: .long trace_hardirqs_on +6: .long trace_hardirqs_off +#endif diff --git a/arch/sh/kernel/stacktrace.c b/arch/sh/kernel/stacktrace.c new file mode 100644 index 000000000000..0d5268afe80f --- /dev/null +++ b/arch/sh/kernel/stacktrace.c @@ -0,0 +1,43 @@ +/* + * arch/sh/kernel/stacktrace.c + * + * Stack trace management functions + * + * Copyright (C) 2006 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include +#include +#include +#include + +/* + * Save stack-backtrace addresses into a stack_trace buffer. + */ +void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +{ + unsigned long *sp; + + if (!task) + task = current; + if (task == current) + sp = (unsigned long *)current_stack_pointer; + else + sp = (unsigned long *)task->thread.sp; + + while (!kstack_end(sp)) { + unsigned long addr = *sp++; + + if (__kernel_text_address(addr)) { + if (trace->skip > 0) + trace->skip--; + else + trace->entries[trace->nr_entries++] = addr; + if (trace->nr_entries >= trace->max_entries) + break; + } + } +} diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c index cfeefc10e254..716ebf568af2 100644 --- a/arch/sh/mm/fault.c +++ b/arch/sh/mm/fault.c @@ -37,6 +37,9 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, int si_code; siginfo_t info; + trace_hardirqs_on(); + local_irq_enable(); + #ifdef CONFIG_SH_KGDB if (kgdb_nofault && kgdb_bus_err_hook) kgdb_bus_err_hook(); -- cgit v1.2.3