mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 20:36:49 +07:00
0ab0d7ac20
Adjust conditions in on_stack function. That fixes backchain unwinder
which was unable to read pt_regs at the very bottom of the stack and
hence couldn't follow stacks (e.g. from async stack to a task stack).
Fixes: 78c98f9074 ("s390/unwind: introduce stack unwind API")
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
115 lines
3.1 KiB
C
115 lines
3.1 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,
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
static 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_stack_pointer();
|
|
return (unsigned long) task->thread.ksp;
|
|
}
|
|
|
|
/*
|
|
* Stack layout of a C stack frame.
|
|
*/
|
|
#ifndef __PACK_STACK
|
|
struct stack_frame {
|
|
unsigned long back_chain;
|
|
unsigned long empty1[5];
|
|
unsigned long gprs[10];
|
|
unsigned int empty2[8];
|
|
};
|
|
#else
|
|
struct stack_frame {
|
|
unsigned long empty1[5];
|
|
unsigned int empty2[8];
|
|
unsigned long gprs[10];
|
|
unsigned long back_chain;
|
|
};
|
|
#endif
|
|
|
|
#define CALL_ARGS_0() \
|
|
register unsigned long r2 asm("2")
|
|
#define CALL_ARGS_1(arg1) \
|
|
register unsigned long r2 asm("2") = (unsigned long)(arg1)
|
|
#define CALL_ARGS_2(arg1, arg2) \
|
|
CALL_ARGS_1(arg1); \
|
|
register unsigned long r3 asm("3") = (unsigned long)(arg2)
|
|
#define CALL_ARGS_3(arg1, arg2, arg3) \
|
|
CALL_ARGS_2(arg1, arg2); \
|
|
register unsigned long r4 asm("4") = (unsigned long)(arg3)
|
|
#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
|
|
CALL_ARGS_3(arg1, arg2, arg3); \
|
|
register unsigned long r4 asm("5") = (unsigned long)(arg4)
|
|
#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
|
|
CALL_ARGS_4(arg1, arg2, arg3, arg4); \
|
|
register unsigned long r4 asm("6") = (unsigned long)(arg5)
|
|
|
|
#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_ON_STACK(fn, stack, nr, args...) \
|
|
({ \
|
|
CALL_ARGS_##nr(args); \
|
|
unsigned long prev; \
|
|
\
|
|
asm volatile( \
|
|
" la %[_prev],0(15)\n" \
|
|
" la 15,0(%[_stack])\n" \
|
|
" stg %[_prev],%[_bc](15)\n" \
|
|
" brasl 14,%[_fn]\n" \
|
|
" la 15,0(%[_prev])\n" \
|
|
: [_prev] "=&a" (prev), CALL_FMT_##nr \
|
|
[_stack] "a" (stack), \
|
|
[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
|
|
[_fn] "X" (fn) : CALL_CLOBBER_##nr); \
|
|
r2; \
|
|
})
|
|
|
|
#endif /* _ASM_S390_STACKTRACE_H */
|