diff options
Diffstat (limited to 'arch/x86/include/asm/ptrace.h')
| -rw-r--r-- | arch/x86/include/asm/ptrace.h | 157 |
1 files changed, 59 insertions, 98 deletions
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h index 78cd1ea9450..6205f0c434d 100644 --- a/arch/x86/include/asm/ptrace.h +++ b/arch/x86/include/asm/ptrace.h @@ -1,44 +1,12 @@ #ifndef _ASM_X86_PTRACE_H #define _ASM_X86_PTRACE_H -#include <linux/compiler.h> /* For __user */ -#include <asm/ptrace-abi.h> -#include <asm/processor-flags.h> - -#ifdef __KERNEL__ #include <asm/segment.h> #include <asm/page_types.h> -#endif +#include <uapi/asm/ptrace.h> #ifndef __ASSEMBLY__ - #ifdef __i386__ -/* this struct defines the way the registers are stored on the - stack during a system call. */ - -#ifndef __KERNEL__ - -struct pt_regs { - long ebx; - long ecx; - long edx; - long esi; - long edi; - long ebp; - long eax; - int xds; - int xes; - int xfs; - int xgs; - long orig_eax; - long eip; - int xcs; - long eflags; - long esp; - int xss; -}; - -#else /* __KERNEL__ */ struct pt_regs { unsigned long bx; @@ -60,42 +28,8 @@ struct pt_regs { unsigned long ss; }; -#endif /* __KERNEL__ */ - #else /* __i386__ */ -#ifndef __KERNEL__ - -struct pt_regs { - unsigned long r15; - unsigned long r14; - unsigned long r13; - unsigned long r12; - unsigned long rbp; - unsigned long rbx; -/* arguments: non interrupts/non tracing syscalls only save upto here*/ - unsigned long r11; - unsigned long r10; - unsigned long r9; - unsigned long r8; - unsigned long rax; - unsigned long rcx; - unsigned long rdx; - unsigned long rsi; - unsigned long rdi; - unsigned long orig_rax; -/* end of arguments */ -/* cpu exception frame or undefined */ - unsigned long rip; - unsigned long cs; - unsigned long eflags; - unsigned long rsp; - unsigned long ss; -/* top of stack page */ -}; - -#else /* __KERNEL__ */ - struct pt_regs { unsigned long r15; unsigned long r14; @@ -103,7 +37,7 @@ struct pt_regs { unsigned long r12; unsigned long bp; unsigned long bx; -/* arguments: non interrupts/non tracing syscalls only save upto here*/ +/* arguments: non interrupts/non tracing syscalls only save up to here*/ unsigned long r11; unsigned long r10; unsigned long r9; @@ -124,24 +58,22 @@ struct pt_regs { /* top of stack page */ }; -#endif /* __KERNEL__ */ #endif /* !__i386__ */ - -#ifdef __KERNEL__ - -#include <linux/init.h> +#ifdef CONFIG_PARAVIRT +#include <asm/paravirt_types.h> +#endif struct cpuinfo_x86; struct task_struct; extern unsigned long profile_pc(struct pt_regs *regs); +#define profile_pc profile_pc extern unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code, int si_code); -void signal_fault(struct pt_regs *regs, void __user *frame, char *where); extern long syscall_trace_enter(struct pt_regs *); extern void syscall_trace_leave(struct pt_regs *); @@ -186,36 +118,43 @@ static inline int v8086_mode(struct pt_regs *regs) #endif } -/* - * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode - * when it traps. The previous stack will be directly underneath the saved - * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. - * - * This is valid only for kernel mode traps. - */ -static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) +#ifdef CONFIG_X86_64 +static inline bool user_64bit_mode(struct pt_regs *regs) { -#ifdef CONFIG_X86_32 - return (unsigned long)(®s->sp); +#ifndef CONFIG_PARAVIRT + /* + * On non-paravirt systems, this is the only long mode CPL 3 + * selector. We do not allow long mode selectors in the LDT. + */ + return regs->cs == __USER_CS; #else - return regs->sp; + /* Headers are too twisted for this to go in paravirt.h. */ + return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; #endif } -static inline unsigned long instruction_pointer(struct pt_regs *regs) -{ - return regs->ip; -} - -static inline unsigned long frame_pointer(struct pt_regs *regs) -{ - return regs->bp; -} +#define current_user_stack_pointer() this_cpu_read(old_rsp) +/* ia32 vs. x32 difference */ +#define compat_user_stack_pointer() \ + (test_thread_flag(TIF_IA32) \ + ? current_pt_regs()->sp \ + : this_cpu_read(old_rsp)) +#endif -static inline unsigned long user_stack_pointer(struct pt_regs *regs) +#ifdef CONFIG_X86_32 +extern unsigned long kernel_stack_pointer(struct pt_regs *regs); +#else +static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) { return regs->sp; } +#endif + +#define GET_IP(regs) ((regs)->ip) +#define GET_FP(regs) ((regs)->bp) +#define GET_USP(regs) ((regs)->sp) + +#include <asm-generic/ptrace.h> /* Query offset/name of register from its name/offset */ extern int regs_query_register_offset(const char *name); @@ -236,6 +175,15 @@ static inline unsigned long regs_get_register(struct pt_regs *regs, { if (unlikely(offset > MAX_REG_OFFSET)) return 0; +#ifdef CONFIG_X86_32 + /* + * Traps from the kernel do not save sp and ss. + * Use the helper function to retrieve sp. + */ + if (offset == offsetof(struct pt_regs, sp) && + regs->cs == __KERNEL_CS) + return kernel_stack_pointer(regs); +#endif return *(unsigned long *)((unsigned long)regs + offset); } @@ -283,14 +231,27 @@ static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, #define ARCH_HAS_USER_SINGLE_STEP_INFO +/* + * When hitting ptrace_stop(), we cannot return using SYSRET because + * that does not restore the full CPU state, only a minimal set. The + * ptracer can change arbitrary register values, which is usually okay + * because the usual ptrace stops run off the signal delivery path which + * forces IRET; however, ptrace_event() stops happen in arbitrary places + * in the kernel and don't force IRET path. + * + * So force IRET path after a ptrace stop. + */ +#define arch_ptrace_stop_needed(code, info) \ +({ \ + set_thread_flag(TIF_NOTIFY_RESUME); \ + false; \ +}) + struct user_desc; extern int do_get_thread_area(struct task_struct *p, int idx, struct user_desc __user *info); extern int do_set_thread_area(struct task_struct *p, int idx, struct user_desc __user *info, int can_allocate); -#endif /* __KERNEL__ */ - #endif /* !__ASSEMBLY__ */ - #endif /* _ASM_X86_PTRACE_H */ |