You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
256 lines
6.8 KiB
256 lines
6.8 KiB
#ifndef _ASM_X86_PTRACE_H |
|
#define _ASM_X86_PTRACE_H |
|
|
|
#include <asm/segment.h> |
|
#include <asm/page_types.h> |
|
#include <uapi/asm/ptrace.h> |
|
|
|
#ifndef __ASSEMBLY__ |
|
#ifdef __i386__ |
|
|
|
struct pt_regs { |
|
unsigned long bx; |
|
unsigned long cx; |
|
unsigned long dx; |
|
unsigned long si; |
|
unsigned long di; |
|
unsigned long bp; |
|
unsigned long ax; |
|
unsigned long ds; |
|
unsigned long es; |
|
unsigned long fs; |
|
unsigned long gs; |
|
unsigned long orig_ax; |
|
unsigned long ip; |
|
unsigned long cs; |
|
unsigned long flags; |
|
unsigned long sp; |
|
unsigned long ss; |
|
}; |
|
|
|
#else /* __i386__ */ |
|
|
|
struct pt_regs { |
|
/* |
|
* C ABI says these regs are callee-preserved. They aren't saved on kernel entry |
|
* unless syscall needs a complete, fully filled "struct pt_regs". |
|
*/ |
|
unsigned long r15; |
|
unsigned long r14; |
|
unsigned long r13; |
|
unsigned long r12; |
|
unsigned long bp; |
|
unsigned long bx; |
|
/* These regs are callee-clobbered. Always saved on kernel entry. */ |
|
unsigned long r11; |
|
unsigned long r10; |
|
unsigned long r9; |
|
unsigned long r8; |
|
unsigned long ax; |
|
unsigned long cx; |
|
unsigned long dx; |
|
unsigned long si; |
|
unsigned long di; |
|
/* |
|
* On syscall entry, this is syscall#. On CPU exception, this is error code. |
|
* On hw interrupt, it's IRQ number: |
|
*/ |
|
unsigned long orig_ax; |
|
/* Return frame for iretq */ |
|
unsigned long ip; |
|
unsigned long cs; |
|
unsigned long flags; |
|
unsigned long sp; |
|
unsigned long ss; |
|
/* top of stack page */ |
|
}; |
|
|
|
#endif /* !__i386__ */ |
|
|
|
#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); |
|
|
|
|
|
extern unsigned long syscall_trace_enter_phase1(struct pt_regs *, u32 arch); |
|
extern long syscall_trace_enter_phase2(struct pt_regs *, u32 arch, |
|
unsigned long phase1_result); |
|
|
|
extern long syscall_trace_enter(struct pt_regs *); |
|
|
|
static inline unsigned long regs_return_value(struct pt_regs *regs) |
|
{ |
|
return regs->ax; |
|
} |
|
|
|
/* |
|
* user_mode(regs) determines whether a register set came from user |
|
* mode. On x86_32, this is true if V8086 mode was enabled OR if the |
|
* register set was from protected mode with RPL-3 CS value. This |
|
* tricky test checks that with one comparison. |
|
* |
|
* On x86_64, vm86 mode is mercifully nonexistent, and we don't need |
|
* the extra check. |
|
*/ |
|
static inline int user_mode(struct pt_regs *regs) |
|
{ |
|
#ifdef CONFIG_X86_32 |
|
return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL; |
|
#else |
|
return !!(regs->cs & 3); |
|
#endif |
|
} |
|
|
|
static inline int v8086_mode(struct pt_regs *regs) |
|
{ |
|
#ifdef CONFIG_X86_32 |
|
return (regs->flags & X86_VM_MASK); |
|
#else |
|
return 0; /* No V86 mode support in long mode */ |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_X86_64 |
|
static inline bool user_64bit_mode(struct pt_regs *regs) |
|
{ |
|
#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 |
|
/* 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 |
|
} |
|
|
|
#define current_user_stack_pointer() current_pt_regs()->sp |
|
#define compat_user_stack_pointer() current_pt_regs()->sp |
|
#endif |
|
|
|
#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); |
|
extern const char *regs_query_register_name(unsigned int offset); |
|
#define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) |
|
|
|
/** |
|
* 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; |
|
#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); |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
#define arch_has_single_step() (1) |
|
#ifdef CONFIG_X86_DEBUGCTLMSR |
|
#define arch_has_block_step() (1) |
|
#else |
|
#define arch_has_block_step() (boot_cpu_data.x86 >= 6) |
|
#endif |
|
|
|
#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) \ |
|
({ \ |
|
force_iret(); \ |
|
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 /* !__ASSEMBLY__ */ |
|
#endif /* _ASM_X86_PTRACE_H */
|
|
|