/usr/share/systemtap/runtime/stack-s390.c is in systemtap-common 1.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /* -*- linux-c -*-
* s390 stack tracing functions
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
static unsigned long
__stp_show_stack (unsigned long sp, unsigned long low,
unsigned long high, int verbose)
{
struct stack_frame *sf;
struct pt_regs *regs;
unsigned long ip;
while (1) {
sp = sp & PSW_ADDR_INSN;
/* fixme: verify this is a kernel stack */
if (sp < low || sp > high - sizeof(*sf))
return sp;
sf = (struct stack_frame *) sp;
ip = sf->gprs[8] & PSW_ADDR_INSN;
if (verbose)
_stp_printf("[%p] [%p] ", (int64_t)sp, (int64_t)ip);
_stp_print_addr((int64_t)ip, verbose, NULL);
/* Follow the back_chain */
while (1) {
low = sp;
sp = sf->back_chain & PSW_ADDR_INSN;
if (!sp)
break;
if (sp <= low || sp > high - sizeof(*sf))
return sp;
sf = (struct stack_frame *) sp;
ip = sf->gprs[8] & PSW_ADDR_INSN;
if (verbose)
_stp_printf("[%p] [%p] ", (int64_t)sp, (int64_t)ip);
_stp_print_addr((int64_t)ip, verbose, NULL);
}
/* Zero backchain detected, check for interrupt frame. */
sp = (unsigned long) (sf + 1);
if (sp <= low || sp > high - sizeof(*regs))
return sp;
regs = (struct pt_regs *) sp;
if (verbose)
_stp_printf("[%p] [%p] ", (int64_t)sp, (int64_t)ip);
_stp_print_addr((int64_t)ip, verbose, NULL);
low = sp;
sp = regs->gprs[15];
}
}
static void __stp_stack_print (struct pt_regs *regs,
int verbose, int levels,
struct task_struct *tsk,
struct unwind_context *uwcontext,
struct uretprobe_instance *ri, int uregs_valid)
{
unsigned long *_sp = (unsigned long *)®_SP(regs);
unsigned long sp = (unsigned long)_sp;
// unsigned long sp = (unsigned long)*_sp;
sp = __stp_show_stack(sp,
S390_lowcore.async_stack - ASYNC_SIZE,
S390_lowcore.async_stack,verbose);
__stp_show_stack(sp,
S390_lowcore.thread_info,
S390_lowcore.thread_info + THREAD_SIZE,verbose);
}
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