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189 lines
5.4 KiB
189 lines
5.4 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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*/ |
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#ifndef _ASM_PTRACE_H |
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#define _ASM_PTRACE_H |
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#include <linux/compiler.h> |
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#include <linux/linkage.h> |
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#include <linux/types.h> |
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#include <asm/isadep.h> |
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#include <asm/page.h> |
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#include <asm/thread_info.h> |
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#include <uapi/asm/ptrace.h> |
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/* |
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* This struct defines the way the registers are stored on the stack during a |
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* system call/exception. As usual the registers k0/k1 aren't being saved. |
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* |
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* If you add a register here, also add it to regoffset_table[] in |
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* arch/mips/kernel/ptrace.c. |
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*/ |
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struct pt_regs { |
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#ifdef CONFIG_32BIT |
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/* Pad bytes for argument save space on the stack. */ |
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unsigned long pad0[8]; |
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#endif |
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/* Saved main processor registers. */ |
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unsigned long regs[32]; |
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/* Saved special registers. */ |
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unsigned long cp0_status; |
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unsigned long hi; |
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unsigned long lo; |
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#ifdef CONFIG_CPU_HAS_SMARTMIPS |
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unsigned long acx; |
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#endif |
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unsigned long cp0_badvaddr; |
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unsigned long cp0_cause; |
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unsigned long cp0_epc; |
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#ifdef CONFIG_CPU_CAVIUM_OCTEON |
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unsigned long long mpl[6]; /* MTM{0-5} */ |
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unsigned long long mtp[6]; /* MTP{0-5} */ |
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#endif |
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unsigned long __last[0]; |
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} __aligned(8); |
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) |
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{ |
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return regs->regs[29]; |
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} |
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static inline void instruction_pointer_set(struct pt_regs *regs, |
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unsigned long val) |
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{ |
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regs->cp0_epc = val; |
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} |
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/* Query offset/name of register from its name/offset */ |
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extern int regs_query_register_offset(const char *name); |
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#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last)) |
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/** |
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* regs_get_register() - get register value from its offset |
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* @regs: pt_regs from which register value is gotten. |
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* @offset: offset number of the register. |
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* |
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* regs_get_register returns the value of a register. The @offset is the |
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* offset of the register in struct pt_regs address which specified by @regs. |
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* If @offset is bigger than MAX_REG_OFFSET, this returns 0. |
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*/ |
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static inline unsigned long regs_get_register(struct pt_regs *regs, |
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unsigned int offset) |
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{ |
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if (unlikely(offset > MAX_REG_OFFSET)) |
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return 0; |
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return *(unsigned long *)((unsigned long)regs + offset); |
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} |
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/** |
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* regs_within_kernel_stack() - check the address in the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @addr: address which is checked. |
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* |
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
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* If @addr is within the kernel stack, it returns true. If not, returns false. |
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*/ |
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static inline int regs_within_kernel_stack(struct pt_regs *regs, |
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unsigned long addr) |
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{ |
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return ((addr & ~(THREAD_SIZE - 1)) == |
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(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
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} |
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/** |
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* regs_get_kernel_stack_nth() - get Nth entry of the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @n: stack entry number. |
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* |
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
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* is specified by @regs. If the @n th entry is NOT in the kernel stack, |
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* this returns 0. |
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*/ |
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static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, |
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unsigned int n) |
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{ |
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unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
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addr += n; |
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if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
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return *addr; |
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else |
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return 0; |
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} |
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struct task_struct; |
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extern int ptrace_getregs(struct task_struct *child, |
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struct user_pt_regs __user *data); |
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extern int ptrace_setregs(struct task_struct *child, |
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struct user_pt_regs __user *data); |
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extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data); |
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extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data); |
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extern int ptrace_get_watch_regs(struct task_struct *child, |
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struct pt_watch_regs __user *addr); |
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extern int ptrace_set_watch_regs(struct task_struct *child, |
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struct pt_watch_regs __user *addr); |
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/* |
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* Does the process account for user or for system time? |
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*/ |
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#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER) |
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static inline int is_syscall_success(struct pt_regs *regs) |
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{ |
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return !regs->regs[7]; |
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} |
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static inline long regs_return_value(struct pt_regs *regs) |
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{ |
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if (is_syscall_success(regs) || !user_mode(regs)) |
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return regs->regs[2]; |
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else |
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return -regs->regs[2]; |
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} |
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#define instruction_pointer(regs) ((regs)->cp0_epc) |
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#define profile_pc(regs) instruction_pointer(regs) |
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extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall); |
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extern asmlinkage void syscall_trace_leave(struct pt_regs *regs); |
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extern void die(const char *, struct pt_regs *) __noreturn; |
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static inline void die_if_kernel(const char *str, struct pt_regs *regs) |
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{ |
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if (unlikely(!user_mode(regs))) |
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die(str, regs); |
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} |
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#define current_pt_regs() \ |
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({ \ |
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unsigned long sp = (unsigned long)__builtin_frame_address(0); \ |
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(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \ |
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}) |
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/* Helpers for working with the user stack pointer */ |
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static inline unsigned long user_stack_pointer(struct pt_regs *regs) |
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{ |
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return regs->regs[29]; |
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} |
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static inline void user_stack_pointer_set(struct pt_regs *regs, |
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unsigned long val) |
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{ |
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regs->regs[29] = val; |
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} |
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#endif /* _ASM_PTRACE_H */
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