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204 lines
6.0 KiB
204 lines
6.0 KiB
/* 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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STACK_TYPE_MCCK, |
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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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/* |
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* Stack layout of a C stack frame. |
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* Kernel uses the packed stack layout (-mpacked-stack). |
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*/ |
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struct stack_frame { |
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union { |
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unsigned long empty[9]; |
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struct { |
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unsigned long sie_control_block; |
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unsigned long sie_savearea; |
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unsigned long sie_reason; |
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unsigned long sie_flags; |
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}; |
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}; |
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unsigned long gprs[10]; |
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unsigned long back_chain; |
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}; |
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/* |
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* Unlike current_stack_pointer which simply contains the current value of %r15 |
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* current_frame_address() returns function stack frame address, which matches |
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* %r15 upon function invocation. It may differ from %r15 later if function |
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* allocates stack for local variables or new stack frame to call other |
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* functions. |
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*/ |
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#define current_frame_address() \ |
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((unsigned long)__builtin_frame_address(0) - \ |
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offsetof(struct stack_frame, back_chain)) |
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static __always_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_frame_address(); |
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return (unsigned long)task->thread.ksp; |
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} |
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/* |
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* To keep this simple mark register 2-6 as being changed (volatile) |
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* by the called function, even though register 6 is saved/nonvolatile. |
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*/ |
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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_LARGS_0(...) \ |
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long dummy = 0 |
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#define CALL_LARGS_1(t1, a1) \ |
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long arg1 = (long)(t1)(a1) |
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#define CALL_LARGS_2(t1, a1, t2, a2) \ |
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CALL_LARGS_1(t1, a1); \ |
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long arg2 = (long)(t2)(a2) |
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#define CALL_LARGS_3(t1, a1, t2, a2, t3, a3) \ |
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CALL_LARGS_2(t1, a1, t2, a2); \ |
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long arg3 = (long)(t3)(a3) |
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#define CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4) \ |
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CALL_LARGS_3(t1, a1, t2, a2, t3, a3); \ |
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long arg4 = (long)(t4)(a4) |
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#define CALL_LARGS_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5) \ |
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CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4); \ |
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long arg5 = (long)(t5)(a5) |
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#define CALL_REGS_0 \ |
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register long r2 asm("2") = dummy |
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#define CALL_REGS_1 \ |
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register long r2 asm("2") = arg1 |
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#define CALL_REGS_2 \ |
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CALL_REGS_1; \ |
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register long r3 asm("3") = arg2 |
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#define CALL_REGS_3 \ |
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CALL_REGS_2; \ |
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register long r4 asm("4") = arg3 |
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#define CALL_REGS_4 \ |
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CALL_REGS_3; \ |
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register long r5 asm("5") = arg4 |
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#define CALL_REGS_5 \ |
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CALL_REGS_4; \ |
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register long r6 asm("6") = arg5 |
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#define CALL_TYPECHECK_0(...) |
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#define CALL_TYPECHECK_1(t, a, ...) \ |
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typecheck(t, a) |
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#define CALL_TYPECHECK_2(t, a, ...) \ |
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CALL_TYPECHECK_1(__VA_ARGS__); \ |
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typecheck(t, a) |
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#define CALL_TYPECHECK_3(t, a, ...) \ |
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CALL_TYPECHECK_2(__VA_ARGS__); \ |
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typecheck(t, a) |
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#define CALL_TYPECHECK_4(t, a, ...) \ |
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CALL_TYPECHECK_3(__VA_ARGS__); \ |
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typecheck(t, a) |
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#define CALL_TYPECHECK_5(t, a, ...) \ |
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CALL_TYPECHECK_4(__VA_ARGS__); \ |
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typecheck(t, a) |
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#define CALL_PARM_0(...) void |
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#define CALL_PARM_1(t, a, ...) t |
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#define CALL_PARM_2(t, a, ...) t, CALL_PARM_1(__VA_ARGS__) |
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#define CALL_PARM_3(t, a, ...) t, CALL_PARM_2(__VA_ARGS__) |
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#define CALL_PARM_4(t, a, ...) t, CALL_PARM_3(__VA_ARGS__) |
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#define CALL_PARM_5(t, a, ...) t, CALL_PARM_4(__VA_ARGS__) |
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#define CALL_PARM_6(t, a, ...) t, CALL_PARM_5(__VA_ARGS__) |
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/* |
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* Use call_on_stack() to call a function switching to a specified |
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* stack. Proper sign and zero extension of function arguments is |
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* done. Usage: |
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* |
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* rc = call_on_stack(nr, stack, rettype, fn, t1, a1, t2, a2, ...) |
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* |
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* - nr specifies the number of function arguments of fn. |
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* - stack specifies the stack to be used. |
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* - fn is the function to be called. |
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* - rettype is the return type of fn. |
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* - t1, a1, ... are pairs, where t1 must match the type of the first |
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* argument of fn, t2 the second, etc. a1 is the corresponding |
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* first function argument (not name), etc. |
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*/ |
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#define call_on_stack(nr, stack, rettype, fn, ...) \ |
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({ \ |
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rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = fn; \ |
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unsigned long frame = current_frame_address(); \ |
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unsigned long __stack = stack; \ |
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unsigned long prev; \ |
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CALL_LARGS_##nr(__VA_ARGS__); \ |
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CALL_REGS_##nr; \ |
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\ |
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CALL_TYPECHECK_##nr(__VA_ARGS__); \ |
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asm volatile( \ |
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" lgr %[_prev],15\n" \ |
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" lg 15,%[_stack]\n" \ |
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" stg %[_frame],%[_bc](15)\n" \ |
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" brasl 14,%[_fn]\n" \ |
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" lgr 15,%[_prev]\n" \ |
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: [_prev] "=&d" (prev), CALL_FMT_##nr \ |
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: [_stack] "R" (__stack), \ |
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[_bc] "i" (offsetof(struct stack_frame, back_chain)), \ |
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[_frame] "d" (frame), \ |
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[_fn] "X" (__fn) : CALL_CLOBBER_##nr); \ |
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(rettype)r2; \ |
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}) |
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#define call_on_stack_noreturn(fn, stack) \ |
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({ \ |
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void (*__fn)(void) = fn; \ |
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\ |
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asm volatile( \ |
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" la 15,0(%[_stack])\n" \ |
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" xc %[_bc](8,15),%[_bc](15)\n" \ |
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" brasl 14,%[_fn]\n" \ |
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::[_bc] "i" (offsetof(struct stack_frame, back_chain)), \ |
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[_stack] "a" (stack), [_fn] "X" (__fn)); \ |
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BUG(); \ |
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}) |
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#endif /* _ASM_S390_STACKTRACE_H */
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