206 lines
6.1 KiB
C
206 lines
6.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_S390_STACKTRACE_H
|
|
#define _ASM_S390_STACKTRACE_H
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <linux/ptrace.h>
|
|
#include <asm/switch_to.h>
|
|
|
|
enum stack_type {
|
|
STACK_TYPE_UNKNOWN,
|
|
STACK_TYPE_TASK,
|
|
STACK_TYPE_IRQ,
|
|
STACK_TYPE_NODAT,
|
|
STACK_TYPE_RESTART,
|
|
STACK_TYPE_MCCK,
|
|
};
|
|
|
|
struct stack_info {
|
|
enum stack_type type;
|
|
unsigned long begin, end;
|
|
};
|
|
|
|
const char *stack_type_name(enum stack_type type);
|
|
int get_stack_info(unsigned long sp, struct task_struct *task,
|
|
struct stack_info *info, unsigned long *visit_mask);
|
|
|
|
static inline bool on_stack(struct stack_info *info,
|
|
unsigned long addr, size_t len)
|
|
{
|
|
if (info->type == STACK_TYPE_UNKNOWN)
|
|
return false;
|
|
if (addr + len < addr)
|
|
return false;
|
|
return addr >= info->begin && addr + len <= info->end;
|
|
}
|
|
|
|
/*
|
|
* Stack layout of a C stack frame.
|
|
* Kernel uses the packed stack layout (-mpacked-stack).
|
|
*/
|
|
struct stack_frame {
|
|
union {
|
|
unsigned long empty[9];
|
|
struct {
|
|
unsigned long sie_control_block;
|
|
unsigned long sie_savearea;
|
|
unsigned long sie_reason;
|
|
unsigned long sie_flags;
|
|
unsigned long sie_control_block_phys;
|
|
};
|
|
};
|
|
unsigned long gprs[10];
|
|
unsigned long back_chain;
|
|
};
|
|
|
|
/*
|
|
* Unlike current_stack_pointer which simply contains the current value of %r15
|
|
* current_frame_address() returns function stack frame address, which matches
|
|
* %r15 upon function invocation. It may differ from %r15 later if function
|
|
* allocates stack for local variables or new stack frame to call other
|
|
* functions.
|
|
*/
|
|
#define current_frame_address() \
|
|
((unsigned long)__builtin_frame_address(0) - \
|
|
offsetof(struct stack_frame, back_chain))
|
|
|
|
static __always_inline unsigned long get_stack_pointer(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
if (regs)
|
|
return (unsigned long)kernel_stack_pointer(regs);
|
|
if (task == current)
|
|
return current_frame_address();
|
|
return (unsigned long)task->thread.ksp;
|
|
}
|
|
|
|
/*
|
|
* To keep this simple mark register 2-6 as being changed (volatile)
|
|
* by the called function, even though register 6 is saved/nonvolatile.
|
|
*/
|
|
#define CALL_FMT_0 "=&d" (r2)
|
|
#define CALL_FMT_1 "+&d" (r2)
|
|
#define CALL_FMT_2 CALL_FMT_1, "+&d" (r3)
|
|
#define CALL_FMT_3 CALL_FMT_2, "+&d" (r4)
|
|
#define CALL_FMT_4 CALL_FMT_3, "+&d" (r5)
|
|
#define CALL_FMT_5 CALL_FMT_4, "+&d" (r6)
|
|
|
|
#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
|
|
#define CALL_CLOBBER_4 CALL_CLOBBER_5
|
|
#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
|
|
#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
|
|
#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
|
|
#define CALL_CLOBBER_0 CALL_CLOBBER_1
|
|
|
|
#define CALL_LARGS_0(...) \
|
|
long dummy = 0
|
|
#define CALL_LARGS_1(t1, a1) \
|
|
long arg1 = (long)(t1)(a1)
|
|
#define CALL_LARGS_2(t1, a1, t2, a2) \
|
|
CALL_LARGS_1(t1, a1); \
|
|
long arg2 = (long)(t2)(a2)
|
|
#define CALL_LARGS_3(t1, a1, t2, a2, t3, a3) \
|
|
CALL_LARGS_2(t1, a1, t2, a2); \
|
|
long arg3 = (long)(t3)(a3)
|
|
#define CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4) \
|
|
CALL_LARGS_3(t1, a1, t2, a2, t3, a3); \
|
|
long arg4 = (long)(t4)(a4)
|
|
#define CALL_LARGS_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5) \
|
|
CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4); \
|
|
long arg5 = (long)(t5)(a5)
|
|
|
|
#define CALL_REGS_0 \
|
|
register long r2 asm("2") = dummy
|
|
#define CALL_REGS_1 \
|
|
register long r2 asm("2") = arg1
|
|
#define CALL_REGS_2 \
|
|
CALL_REGS_1; \
|
|
register long r3 asm("3") = arg2
|
|
#define CALL_REGS_3 \
|
|
CALL_REGS_2; \
|
|
register long r4 asm("4") = arg3
|
|
#define CALL_REGS_4 \
|
|
CALL_REGS_3; \
|
|
register long r5 asm("5") = arg4
|
|
#define CALL_REGS_5 \
|
|
CALL_REGS_4; \
|
|
register long r6 asm("6") = arg5
|
|
|
|
#define CALL_TYPECHECK_0(...)
|
|
#define CALL_TYPECHECK_1(t, a, ...) \
|
|
typecheck(t, a)
|
|
#define CALL_TYPECHECK_2(t, a, ...) \
|
|
CALL_TYPECHECK_1(__VA_ARGS__); \
|
|
typecheck(t, a)
|
|
#define CALL_TYPECHECK_3(t, a, ...) \
|
|
CALL_TYPECHECK_2(__VA_ARGS__); \
|
|
typecheck(t, a)
|
|
#define CALL_TYPECHECK_4(t, a, ...) \
|
|
CALL_TYPECHECK_3(__VA_ARGS__); \
|
|
typecheck(t, a)
|
|
#define CALL_TYPECHECK_5(t, a, ...) \
|
|
CALL_TYPECHECK_4(__VA_ARGS__); \
|
|
typecheck(t, a)
|
|
|
|
#define CALL_PARM_0(...) void
|
|
#define CALL_PARM_1(t, a, ...) t
|
|
#define CALL_PARM_2(t, a, ...) t, CALL_PARM_1(__VA_ARGS__)
|
|
#define CALL_PARM_3(t, a, ...) t, CALL_PARM_2(__VA_ARGS__)
|
|
#define CALL_PARM_4(t, a, ...) t, CALL_PARM_3(__VA_ARGS__)
|
|
#define CALL_PARM_5(t, a, ...) t, CALL_PARM_4(__VA_ARGS__)
|
|
#define CALL_PARM_6(t, a, ...) t, CALL_PARM_5(__VA_ARGS__)
|
|
|
|
/*
|
|
* Use call_on_stack() to call a function switching to a specified
|
|
* stack. Proper sign and zero extension of function arguments is
|
|
* done. Usage:
|
|
*
|
|
* rc = call_on_stack(nr, stack, rettype, fn, t1, a1, t2, a2, ...)
|
|
*
|
|
* - nr specifies the number of function arguments of fn.
|
|
* - stack specifies the stack to be used.
|
|
* - fn is the function to be called.
|
|
* - rettype is the return type of fn.
|
|
* - t1, a1, ... are pairs, where t1 must match the type of the first
|
|
* argument of fn, t2 the second, etc. a1 is the corresponding
|
|
* first function argument (not name), etc.
|
|
*/
|
|
#define call_on_stack(nr, stack, rettype, fn, ...) \
|
|
({ \
|
|
rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = fn; \
|
|
unsigned long frame = current_frame_address(); \
|
|
unsigned long __stack = stack; \
|
|
unsigned long prev; \
|
|
CALL_LARGS_##nr(__VA_ARGS__); \
|
|
CALL_REGS_##nr; \
|
|
\
|
|
CALL_TYPECHECK_##nr(__VA_ARGS__); \
|
|
asm volatile( \
|
|
" lgr %[_prev],15\n" \
|
|
" lg 15,%[_stack]\n" \
|
|
" stg %[_frame],%[_bc](15)\n" \
|
|
" brasl 14,%[_fn]\n" \
|
|
" lgr 15,%[_prev]\n" \
|
|
: [_prev] "=&d" (prev), CALL_FMT_##nr \
|
|
: [_stack] "R" (__stack), \
|
|
[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
|
|
[_frame] "d" (frame), \
|
|
[_fn] "X" (__fn) : CALL_CLOBBER_##nr); \
|
|
(rettype)r2; \
|
|
})
|
|
|
|
#define call_on_stack_noreturn(fn, stack) \
|
|
({ \
|
|
void (*__fn)(void) = fn; \
|
|
\
|
|
asm volatile( \
|
|
" la 15,0(%[_stack])\n" \
|
|
" xc %[_bc](8,15),%[_bc](15)\n" \
|
|
" brasl 14,%[_fn]\n" \
|
|
::[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
|
|
[_stack] "a" (stack), [_fn] "X" (__fn)); \
|
|
BUG(); \
|
|
})
|
|
|
|
#endif /* _ASM_S390_STACKTRACE_H */
|