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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /* 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 */ |