/* * Copyright (C) 2001 PPC64 Team, IBM Corp * * This struct defines the way the registers are stored on the * kernel stack during a system call or other kernel entry. * * this should only contain volatile regs * since we can keep non-volatile in the thread_struct * should set this up when only volatiles are saved * by intr code. * * Since this is going on the stack, *CARE MUST BE TAKEN* to insure * that the overall structure is a multiple of 16 bytes in length. * * Note that the offsets of the fields in this struct correspond with * the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c. * * 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. */ #ifndef _ASM_POWERPC_PTRACE_H #define _ASM_POWERPC_PTRACE_H #include <uapi/asm/ptrace.h> #ifdef __powerpc64__ /* * Size of redzone that userspace is allowed to use below the stack * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in * the new ELFv2 little-endian ABI, so we allow the larger amount. * * For kernel code we allow a 288-byte redzone, in order to conserve * kernel stack space; gcc currently only uses 288 bytes, and will * hopefully allow explicit control of the redzone size in future. */ #define USER_REDZONE_SIZE 512 #define KERNEL_REDZONE_SIZE 288 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */ #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265) #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \ STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE) #define STACK_FRAME_MARKER 12 /* Size of dummy stack frame allocated when calling signal handler. */ #define __SIGNAL_FRAMESIZE 128 #define __SIGNAL_FRAMESIZE32 64 #else /* __powerpc64__ */ #define USER_REDZONE_SIZE 0 #define KERNEL_REDZONE_SIZE 0 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */ #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */ #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773) #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) #define STACK_FRAME_MARKER 2 /* Size of stack frame allocated when calling signal handler. */ #define __SIGNAL_FRAMESIZE 64 #endif /* __powerpc64__ */ #ifndef __ASSEMBLY__ #define GET_IP(regs) ((regs)->nip) #define GET_USP(regs) ((regs)->gpr[1]) #define GET_FP(regs) (0) #define SET_FP(regs, val) #ifdef CONFIG_SMP extern unsigned long profile_pc(struct pt_regs *regs); #define profile_pc profile_pc #endif #include <asm-generic/ptrace.h> #define kernel_stack_pointer(regs) ((regs)->gpr[1]) static inline int is_syscall_success(struct pt_regs *regs) { return !(regs->ccr & 0x10000000); } static inline long regs_return_value(struct pt_regs *regs) { if (is_syscall_success(regs)) return regs->gpr[3]; else return -regs->gpr[3]; } #ifdef __powerpc64__ #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1) #else #define user_mode(regs) (((regs)->msr & MSR_PR) != 0) #endif #define force_successful_syscall_return() \ do { \ set_thread_flag(TIF_NOERROR); \ } while(0) struct task_struct; extern int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data); extern int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data); #define current_pt_regs() \ ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1) /* * We use the least-significant bit of the trap field to indicate * whether we have saved the full set of registers, or only a * partial set. A 1 there means the partial set. * On 4xx we use the next bit to indicate whether the exception * is a critical exception (1 means it is). */ #define FULL_REGS(regs) (((regs)->trap & 1) == 0) #ifndef __powerpc64__ #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0) #endif /* ! __powerpc64__ */ #define TRAP(regs) ((regs)->trap & ~0xF) #ifdef __powerpc64__ #define NV_REG_POISON 0xdeadbeefdeadbeefUL #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1) #else #define NV_REG_POISON 0xdeadbeef #define CHECK_FULL_REGS(regs) \ do { \ if ((regs)->trap & 1) \ printk(KERN_CRIT "%s: partial register set\n", __func__); \ } while (0) #endif /* __powerpc64__ */ #define arch_has_single_step() (1) #define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601)) #define ARCH_HAS_USER_SINGLE_STEP_INFO /* * kprobe-based event tracer support */ #include <linux/stddef.h> #include <linux/thread_info.h> extern int regs_query_register_offset(const char *name); extern const char *regs_query_register_name(unsigned int offset); #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr)) /** * 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 whose offset from @regs. * The @offset is the offset of the register in struct pt_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 bool 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; } #endif /* __ASSEMBLY__ */ #ifndef __powerpc64__ #else /* __powerpc64__ */ #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */ #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */ #define PT_VSCR_32 (PT_VR0 + 32*4 + 3) #define PT_VRSAVE_32 (PT_VR0 + 33*4) #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */ #endif /* __powerpc64__ */ #endif /* _ASM_POWERPC_PTRACE_H */