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/* 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;
/*
* On interrupt, gs and __gsh store the vector number. They never
* store gs any more.
*/
unsigned short gs;
unsigned short __gsh;
/* On interrupt, this is the error code. */
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
#include <asm/proto.h>
struct cpuinfo_x86;
struct task_struct;
extern unsigned long profile_pc(struct pt_regs *regs);
extern unsigned long
convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
extern void send_sigtrap(struct pt_regs *regs, int error_code, int si_code);
static inline unsigned long regs_return_value(struct pt_regs *regs)
{
return regs->ax;
}
static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
regs->ax = rc;
}
/*
* 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 __always_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
}
static inline bool user_64bit_mode(struct pt_regs *regs)
{
#ifdef CONFIG_X86_64
#ifndef CONFIG_PARAVIRT_XXL
/*
* 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
#else /* !CONFIG_X86_64 */
return false;
#endif
}
/*
* Determine whether the register set came from any context that is running in
* 64-bit mode.
*/
static inline bool any_64bit_mode(struct pt_regs *regs)
{
#ifdef CONFIG_X86_64
return !user_mode(regs) || user_64bit_mode(regs);
#else
return false;
#endif
}
#ifdef CONFIG_X86_64
#define current_user_stack_pointer() current_pt_regs()->sp
#define compat_user_stack_pointer() current_pt_regs()->sp
static inline bool ip_within_syscall_gap(struct pt_regs *regs)
{
bool ret = (regs->ip >= (unsigned long)entry_SYSCALL_64 &&
regs->ip < (unsigned long)entry_SYSCALL_64_safe_stack);
#ifdef CONFIG_IA32_EMULATION
ret = ret || (regs->ip >= (unsigned long)entry_SYSCALL_compat &&
regs->ip < (unsigned long)entry_SYSCALL_compat_safe_stack);
#endif
return ret;
}
#endif
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
return regs->sp;
}
static inline unsigned long instruction_pointer(struct pt_regs *regs)
{
return regs->ip;
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->ip = val;
}
static inline unsigned long frame_pointer(struct pt_regs *regs)
{
return regs->bp;
}
static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
return regs->sp;
}
static inline void user_stack_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->sp = val;
}
static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
{
return !(regs->flags & X86_EFLAGS_IF);
}
/* 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
/* 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);
}
/**
* 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)) == (regs->sp & ~(THREAD_SIZE - 1)));
}
/**
* regs_get_kernel_stack_nth_addr() - get the address of the Nth entry on stack
* @regs: pt_regs which contains kernel stack pointer.
* @n: stack entry number.
*
* regs_get_kernel_stack_nth() returns the address of the @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 NULL.
*/
static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs, unsigned int n)
{
unsigned long *addr = (unsigned long *)regs->sp;
addr += n;
if (regs_within_kernel_stack(regs, (unsigned long)addr))
return addr;
else
return NULL;
}
/* To avoid include hell, we can't include uaccess.h */
extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size);
/**
* 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 val;
long ret;
addr = regs_get_kernel_stack_nth_addr(regs, n);
if (addr) {
ret = copy_from_kernel_nofault(&val, addr, sizeof(val));
if (!ret)
return val;
}
return 0;
}
/**
* regs_get_kernel_argument() - get Nth function argument in kernel
* @regs: pt_regs of that context
* @n: function argument number (start from 0)
*
* regs_get_argument() returns @n th argument of the function call.
* Note that this chooses most probably assignment, in some case
* it can be incorrect.
* This is expected to be called from kprobes or ftrace with regs
* where the top of stack is the return address.
*/
static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
unsigned int n)
{
static const unsigned int argument_offs[] = {
#ifdef __i386__
offsetof(struct pt_regs, ax),
offsetof(struct pt_regs, dx),
offsetof(struct pt_regs, cx),
#define NR_REG_ARGUMENTS 3
#else
offsetof(struct pt_regs, di),
offsetof(struct pt_regs, si),
offsetof(struct pt_regs, dx),
offsetof(struct pt_regs, cx),
offsetof(struct pt_regs, r8),
offsetof(struct pt_regs, r9),
#define NR_REG_ARGUMENTS 6
#endif
};
if (n >= NR_REG_ARGUMENTS) {
n -= NR_REG_ARGUMENTS - 1;
return regs_get_kernel_stack_nth(regs, n);
} else
return regs_get_register(regs, argument_offs[n]);
}
#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_REPORT
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);
#ifdef CONFIG_X86_64
# define do_set_thread_area_64(p, s, t) do_arch_prctl_64(p, s, t)
#else
# define do_set_thread_area_64(p, s, t) (0)
#endif
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_PTRACE_H */
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