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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262/* SPDX-License-Identifier: GPL-2.0 */#ifndef _ASM_S390_STACKTRACE_H#define _ASM_S390_STACKTRACE_H
#include <linux/stacktrace.h>#include <linux/uaccess.h>#include <linux/ptrace.h>
struct stack_frame_user { unsigned long back_chain; unsigned long empty1[5]; unsigned long gprs[10]; unsigned long empty2[4];};
struct stack_frame_vdso_wrapper { struct stack_frame_user sf; unsigned long return_address;};
struct perf_callchain_entry_ctx;
void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie, struct perf_callchain_entry_ctx *entry, const struct pt_regs *regs, bool perf);
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_return; unsigned long sie_flags; unsigned long sie_control_block_phys; unsigned long sie_guest_asce; unsigned long sie_irq; }; }; 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]" \ : [_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; \})
/* * Use call_nodat() to call a function with DAT disabled. * Proper sign and zero extension of function arguments is done. * Usage: * * rc = call_nodat(nr, rettype, fn, t1, a1, t2, a2, ...) * * - nr specifies the number of function arguments of fn. * - fn is the function to be called, where fn is a physical address. * - 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. * * fn() is called with standard C function call ABI, with the exception * that no useful stackframe or stackpointer is passed via register 15. * Therefore the called function must not use r15 to access the stack. */#define call_nodat(nr, rettype, fn, ...) \({ \ rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = (fn); \ /* aligned since psw_leave must not cross page boundary */ \ psw_t __aligned(16) psw_leave; \ psw_t psw_enter; \ CALL_LARGS_##nr(__VA_ARGS__); \ CALL_REGS_##nr; \ \ CALL_TYPECHECK_##nr(__VA_ARGS__); \ psw_enter.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT; \ psw_enter.addr = (unsigned long)__fn; \ asm volatile( \ " epsw 0,1\n" \ " risbg 1,0,0,31,32\n" \ " larl 7,1f\n" \ " stg 1,%[psw_leave]\n" \ " stg 7,8+%[psw_leave]\n" \ " la 7,%[psw_leave]\n" \ " lra 7,0(7)\n" \ " larl 1,0f\n" \ " lra 14,0(1)\n" \ " lpswe %[psw_enter]\n" \ "0: lpswe 0(7)\n" \ "1:" \ : CALL_FMT_##nr, [psw_leave] "=Q" (psw_leave) \ : [psw_enter] "Q" (psw_enter) \ : "7", CALL_CLOBBER_##nr); \ (rettype)r2; \})
#endif /* _ASM_S390_STACKTRACE_H */