From 6c6bd754bf43d59756f094de144ecac239629dda Mon Sep 17 00:00:00 2001 From: Brian Rogan Date: Mon, 27 Mar 2006 11:57:01 +1100 Subject: [PATCH] powerpc: Add oprofile calltrace support Add oprofile calltrace support to powerpc. Disable spinlock backtracing now we can use calltrace info. (Updated to work on both 32bit and 64bit by me). Signed-off-by: Anton Blanchard Signed-off-by: Paul Mackerras --- arch/powerpc/oprofile/backtrace.c | 126 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 arch/powerpc/oprofile/backtrace.c (limited to 'arch/powerpc/oprofile/backtrace.c') diff --git a/arch/powerpc/oprofile/backtrace.c b/arch/powerpc/oprofile/backtrace.c new file mode 100644 index 00000000000000..75f57bc96b4044 --- /dev/null +++ b/arch/powerpc/oprofile/backtrace.c @@ -0,0 +1,126 @@ +/** + * Copyright (C) 2005 Brian Rogan , IBM + * + * This program 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 + * 2 of the License, or (at your option) any later version. +**/ + +#include +#include +#include +#include + +#define STACK_SP(STACK) *(STACK) + +#define STACK_LR64(STACK) *((unsigned long *)(STACK) + 2) +#define STACK_LR32(STACK) *((unsigned int *)(STACK) + 1) + +#ifdef CONFIG_PPC64 +#define STACK_LR(STACK) STACK_LR64(STACK) +#else +#define STACK_LR(STACK) STACK_LR32(STACK) +#endif + +static unsigned int user_getsp32(unsigned int sp, int is_first) +{ + unsigned int stack_frame[2]; + + if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame))) + return 0; + + /* + * The most likely reason for this is that we returned -EFAULT, + * which means that we've done all that we can do from + * interrupt context. + */ + if (__copy_from_user_inatomic(stack_frame, (void *)(long)sp, + sizeof(stack_frame))) + return 0; + + if (!is_first) + oprofile_add_trace(STACK_LR32(stack_frame)); + + /* + * We do not enforce increasing stack addresses here because + * we may transition to a different stack, eg a signal handler. + */ + return STACK_SP(stack_frame); +} + +#ifdef CONFIG_PPC64 +static unsigned long user_getsp64(unsigned long sp, int is_first) +{ + unsigned long stack_frame[3]; + + if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame))) + return 0; + + if (__copy_from_user_inatomic(stack_frame, (void *)sp, + sizeof(stack_frame))) + return 0; + + if (!is_first) + oprofile_add_trace(STACK_LR64(stack_frame)); + + return STACK_SP(stack_frame); +} +#endif + +static unsigned long kernel_getsp(unsigned long sp, int is_first) +{ + unsigned long *stack_frame = (unsigned long *)sp; + + if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD)) + return 0; + + if (!is_first) + oprofile_add_trace(STACK_LR(stack_frame)); + + /* + * We do not enforce increasing stack addresses here because + * we might be transitioning from an interrupt stack to a kernel + * stack. validate_sp() is designed to understand this, so just + * use it. + */ + return STACK_SP(stack_frame); +} + +void op_powerpc_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + unsigned long sp = regs->gpr[1]; + int first_frame = 1; + + /* We ditch the top stackframe so need to loop through an extra time */ + depth += 1; + + if (!user_mode(regs)) { + while (depth--) { + sp = kernel_getsp(sp, first_frame); + if (!sp) + break; + first_frame = 0; + } + } else { +#ifdef CONFIG_PPC64 + if (!test_thread_flag(TIF_32BIT)) { + while (depth--) { + sp = user_getsp64(sp, first_frame); + if (!sp) + break; + first_frame = 0; + } + + return; + } +#endif + + while (depth--) { + sp = user_getsp32(sp, first_frame); + if (!sp) + break; + first_frame = 0; + } + } +} -- cgit 1.2.3-korg