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Diffstat (limited to 'arch/mips/include/asm/ptrace.h')
| -rw-r--r-- | arch/mips/include/asm/ptrace.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h new file mode 100644 index 000000000..b6578611d --- /dev/null +++ b/arch/mips/include/asm/ptrace.h @@ -0,0 +1,194 @@ +/* + * 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]; +} + +/* + * Don't use asm-generic/ptrace.h it defines FP accessors that don't make + * sense on MIPS. We rather want an error if they get invoked. + */ + +static inline void instruction_pointer_set(struct pt_regs *regs, + unsigned long val) +{ + regs->cp0_epc = val; +} + +/* 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, long syscall); +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 */ |