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/* * 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. * * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #ifndef _ASM_PTRACE_H #define _ASM_PTRACE_H #include <linux/compiler.h> #include <linux/linkage.h> #include <linux/types.h> #include <asm/isadep.h> #include <asm/page.h> #include <asm/thread_info.h> #include <uapi/asm/ptrace.h> /* * This struct defines the way the registers are stored on the stack during a * system call/exception. As usual the registers k0/k1 aren't being saved. * * If you add a register here, also add it to regoffset_table[] in * arch/mips/kernel/ptrace.c. */ struct pt_regs { #ifdef CONFIG_32BIT /* Pad bytes for argument save space on the stack. */ unsigned long pad0[8]; #endif /* Saved main processor registers. */ unsigned long regs[32]; /* Saved special registers. */ unsigned long cp0_status; unsigned long hi; unsigned long lo; #ifdef CONFIG_CPU_HAS_SMARTMIPS unsigned long acx; #endif unsigned long cp0_badvaddr; unsigned long cp0_cause; unsigned long cp0_epc; #ifdef CONFIG_CPU_CAVIUM_OCTEON unsigned long long mpl[6]; /* MTM{0-5} */ unsigned long long mtp[6]; /* MTP{0-5} */ #endif unsigned long __last[0]; } __aligned(8); static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) { return regs->regs[31]; } static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val) { regs->cp0_epc = val; regs->cp0_cause &= ~CAUSEF_BD; } /* Query offset/name of register from its name/offset */ extern int regs_query_register_offset(const char *name); #define MAX_REG_OFFSET (offsetof(struct pt_regs, __last)) /** * regs_get_register() - get register value from its offset * @regs: pt_regs from which register value is gotten. * @offset: offset number of the register. * * regs_get_register returns the value of a register. The @offset is the * offset of the register in struct pt_regs address which specified by @regs. * If @offset is bigger than MAX_REG_OFFSET, this returns 0. */ static inline unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) { if (unlikely(offset > MAX_REG_OFFSET)) return 0; return *(unsigned long *)((unsigned long)regs + offset); } /** * regs_within_kernel_stack() - check the address in the stack * @regs: pt_regs which contains kernel stack pointer. * @addr: address which is checked. * * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). * If @addr is within the kernel stack, it returns true. If not, returns false. */ static inline int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) { return ((addr & ~(THREAD_SIZE - 1)) == (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); } /** * regs_get_kernel_stack_nth() - get Nth entry of the stack * @regs: pt_regs which contains kernel stack pointer. * @n: stack entry number. * * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which * is specified by @regs. If the @n th entry is NOT in the kernel stack, * this returns 0. */ static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) { unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); addr += n; if (regs_within_kernel_stack(regs, (unsigned long)addr)) return *addr; else return 0; } struct task_struct; extern int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data); extern int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data); extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data); extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data); extern int ptrace_get_watch_regs(struct task_struct *child, struct pt_watch_regs __user *addr); extern int ptrace_set_watch_regs(struct task_struct *child, struct pt_watch_regs __user *addr); /* * Does the process account for user or for system time? */ #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER) static inline int is_syscall_success(struct pt_regs *regs) { return !regs->regs[7]; } static inline long regs_return_value(struct pt_regs *regs) { if (is_syscall_success(regs) || !user_mode(regs)) return regs->regs[2]; else return -regs->regs[2]; } #define instruction_pointer(regs) ((regs)->cp0_epc) #define profile_pc(regs) instruction_pointer(regs) extern asmlinkage long syscall_trace_enter(struct pt_regs *regs); extern asmlinkage void syscall_trace_leave(struct pt_regs *regs); extern void die(const char *, struct pt_regs *) __noreturn; static inline void die_if_kernel(const char *str, struct pt_regs *regs) { if (unlikely(!user_mode(regs))) die(str, regs); } #define current_pt_regs() \ ({ \ unsigned long sp = (unsigned long)__builtin_frame_address(0); \ (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \ }) /* Helpers for working with the user stack pointer */ static inline unsigned long user_stack_pointer(struct pt_regs *regs) { return regs->regs[29]; } static inline void user_stack_pointer_set(struct pt_regs *regs, unsigned long val) { regs->regs[29] = val; } #endif /* _ASM_PTRACE_H */
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