Release 4.14 arch/x86/include/asm/ptrace.h
/* SPDX-License-Identifier: GPL-2.0 */
#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 {
/*
* NB: 32-bit x86 CPUs are inconsistent as what happens in the
* following cases (where %seg represents a segment register):
*
* - pushl %seg: some do a 16-bit write and leave the high
* bits alone
* - movl %seg, [mem]: some do a 16-bit write despite the movl
* - IDT entry: some (e.g. 486) will leave the high bits of CS
* and (if applicable) SS undefined.
*
* Fortunately, x86-32 doesn't read the high bits on POP or IRET,
* so we can just treat all of the segment registers as 16-bit
* values.
*/
unsigned long bx;
unsigned long cx;
unsigned long dx;
unsigned long si;
unsigned long di;
unsigned long bp;
unsigned long ax;
unsigned short ds;
unsigned short __dsh;
unsigned short es;
unsigned short __esh;
unsigned short fs;
unsigned short __fsh;
unsigned short gs;
unsigned short __gsh;
unsigned long orig_ax;
unsigned long ip;
unsigned short cs;
unsigned short __csh;
unsigned long flags;
unsigned long sp;
unsigned short ss;
unsigned short __ssh;
};
#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);
static inline unsigned long regs_return_value(struct pt_regs *regs)
{
return regs->ax;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harvey Harrison | 18 | 100.00% | 2 | 100.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
/*
* 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
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harvey Harrison | 40 | 78.43% | 1 | 50.00% |
| Jan Beulich | 11 | 21.57% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
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
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harvey Harrison | 31 | 96.88% | 1 | 50.00% |
| Cyrill V. Gorcunov | 1 | 3.12% | 1 | 50.00% |
| Total | 32 | 100.00% | 2 | 100.00% |
#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
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Lutomirski | 43 | 100.00% | 1 | 100.00% |
| Total | 43 | 100.00% | 1 | 100.00% |
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harvey Harrison | 17 | 94.44% | 1 | 50.00% |
| Masami Hiramatsu | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
#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);
/* The selector fields are 16-bit. */
if (offset == offsetof(struct pt_regs, cs) ||
offset == offsetof(struct pt_regs, ss) ||
offset == offsetof(struct pt_regs, ds) ||
offset == offsetof(struct pt_regs, es) ||
offset == offsetof(struct pt_regs, fs) ||
offset == offsetof(struct pt_regs, gs)) {
return *(u16 *)((unsigned long)regs + offset);
}
#endif
return *(unsigned long *)((unsigned long)regs + offset);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Lutomirski | 81 | 51.59% | 1 | 33.33% |
| Masami Hiramatsu | 46 | 29.30% | 1 | 33.33% |
| Steven Rostedt | 30 | 19.11% | 1 | 33.33% |
| Total | 157 | 100.00% | 3 | 100.00% |
/**
* 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)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Masami Hiramatsu | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
/**
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Masami Hiramatsu | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
#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 */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Masami Hiramatsu | 179 | 20.36% | 3 | 8.33% |
| Andrew Lutomirski | 169 | 19.23% | 4 | 11.11% |
| Harvey Harrison | 149 | 16.95% | 4 | 11.11% |
| H. Peter Anvin | 141 | 16.04% | 2 | 5.56% |
| Roland McGrath | 71 | 8.08% | 4 | 11.11% |
| Thomas Gleixner | 48 | 5.46% | 2 | 5.56% |
| Steven Rostedt | 30 | 3.41% | 1 | 2.78% |
| Mike Frysinger | 19 | 2.16% | 1 | 2.78% |
| Robert Richter | 18 | 2.05% | 1 | 2.78% |
| Tejun Heo | 13 | 1.48% | 2 | 5.56% |
| Jan Beulich | 11 | 1.25% | 1 | 2.78% |
| Al Viro | 8 | 0.91% | 1 | 2.78% |
| Denys Vlasenko | 6 | 0.68% | 2 | 5.56% |
| Markus Metzger | 3 | 0.34% | 1 | 2.78% |
| David Howells | 3 | 0.34% | 1 | 2.78% |
| Srinivasa D S | 3 | 0.34% | 1 | 2.78% |
| Oleg Nesterov | 3 | 0.34% | 1 | 2.78% |
| Vegard Nossum | 2 | 0.23% | 1 | 2.78% |
| Cyrill V. Gorcunov | 1 | 0.11% | 1 | 2.78% |
| Brian Gerst | 1 | 0.11% | 1 | 2.78% |
| Greg Kroah-Hartman | 1 | 0.11% | 1 | 2.78% |
| Total | 879 | 100.00% | 36 | 100.00% |
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