115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_STACKTRACE_H
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#define _ASM_S390_STACKTRACE_H
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#include <linux/uaccess.h>
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#include <linux/ptrace.h>
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#include <asm/switch_to.h>
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enum stack_type {
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STACK_TYPE_UNKNOWN,
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STACK_TYPE_TASK,
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STACK_TYPE_IRQ,
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STACK_TYPE_NODAT,
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STACK_TYPE_RESTART,
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};
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struct stack_info {
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enum stack_type type;
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unsigned long begin, end;
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};
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const char *stack_type_name(enum stack_type type);
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int get_stack_info(unsigned long sp, struct task_struct *task,
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struct stack_info *info, unsigned long *visit_mask);
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static inline bool on_stack(struct stack_info *info,
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unsigned long addr, size_t len)
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{
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if (info->type == STACK_TYPE_UNKNOWN)
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return false;
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if (addr + len < addr)
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return false;
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return addr >= info->begin && addr + len <= info->end;
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}
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static inline unsigned long get_stack_pointer(struct task_struct *task,
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struct pt_regs *regs)
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{
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if (regs)
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return (unsigned long) kernel_stack_pointer(regs);
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if (task == current)
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return current_stack_pointer();
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return (unsigned long) task->thread.ksp;
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}
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/*
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* Stack layout of a C stack frame.
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*/
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#ifndef __PACK_STACK
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struct stack_frame {
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unsigned long back_chain;
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unsigned long empty1[5];
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unsigned long gprs[10];
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unsigned int empty2[8];
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};
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#else
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struct stack_frame {
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unsigned long empty1[5];
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unsigned int empty2[8];
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unsigned long gprs[10];
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unsigned long back_chain;
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};
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#endif
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#define CALL_ARGS_0() \
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register unsigned long r2 asm("2")
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#define CALL_ARGS_1(arg1) \
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register unsigned long r2 asm("2") = (unsigned long)(arg1)
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#define CALL_ARGS_2(arg1, arg2) \
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CALL_ARGS_1(arg1); \
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register unsigned long r3 asm("3") = (unsigned long)(arg2)
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#define CALL_ARGS_3(arg1, arg2, arg3) \
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CALL_ARGS_2(arg1, arg2); \
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register unsigned long r4 asm("4") = (unsigned long)(arg3)
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#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
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CALL_ARGS_3(arg1, arg2, arg3); \
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register unsigned long r4 asm("5") = (unsigned long)(arg4)
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#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
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CALL_ARGS_4(arg1, arg2, arg3, arg4); \
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register unsigned long r4 asm("6") = (unsigned long)(arg5)
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#define CALL_FMT_0 "=&d" (r2) :
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#define CALL_FMT_1 "+&d" (r2) :
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#define CALL_FMT_2 CALL_FMT_1 "d" (r3),
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#define CALL_FMT_3 CALL_FMT_2 "d" (r4),
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#define CALL_FMT_4 CALL_FMT_3 "d" (r5),
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#define CALL_FMT_5 CALL_FMT_4 "d" (r6),
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#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
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#define CALL_CLOBBER_4 CALL_CLOBBER_5
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#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
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#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
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#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
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#define CALL_CLOBBER_0 CALL_CLOBBER_1
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#define CALL_ON_STACK(fn, stack, nr, args...) \
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({ \
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CALL_ARGS_##nr(args); \
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unsigned long prev; \
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\
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asm volatile( \
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" la %[_prev],0(15)\n" \
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" la 15,0(%[_stack])\n" \
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" stg %[_prev],%[_bc](15)\n" \
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" brasl 14,%[_fn]\n" \
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" la 15,0(%[_prev])\n" \
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: [_prev] "=&a" (prev), CALL_FMT_##nr \
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[_stack] "a" (stack), \
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[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
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[_fn] "X" (fn) : CALL_CLOBBER_##nr); \
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r2; \
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})
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#endif /* _ASM_S390_STACKTRACE_H */
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