Orange Pi5 kernel

/* 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. */
<------>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 */