mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-27 21:43:42 +01:00
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
#include <libunwind.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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typedef void (*template_t) (int, void (*)(),
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int (*)(const char *, ...), const char *,
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const char **);
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static const char *strarr[] =
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{
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"i", "ii", "iii", "iv", "v", "vi", "vii", "viii", "ix", "x", NULL
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};
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#ifdef __ia64__
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struct fdesc
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{
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long code;
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long gp;
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};
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# define get_fdesc(fdesc,func) (fdesc = *(struct fdesc *) &(func))
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# define get_funcp(fdesc) ((template_t) &(fdesc))
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#else
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struct fdesc
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{
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long code;
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};
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# define get_fdesc(fdesc,func) (fdesc.code = (long) &(func))
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# define get_funcp(fdesc) ((template_t) (fdesc).code)
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#endif
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static void
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flush_cache (void *addr, unsigned long len)
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{
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void *end = (char *) addr + len;
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#ifdef __ia64__
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while (addr < end)
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{
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asm volatile ("fc %0" :: "r"(addr));
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addr = (char *) addr + 32;
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}
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asm volatile (";;sync.i;;srlz.i;;");
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#endif
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}
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void
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template (int i, template_t self,
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int (*printer)(const char *, ...), const char *fmt, const char **arr)
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{
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(*printer) (fmt, arr[11 - i][0], arr[11 - i] + 1);
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if (i > 0)
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(*self) (i - 1, self, printer, fmt, arr);
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}
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static void
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sighandler (int signal)
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{
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unw_cursor_t cursor;
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unw_word_t ip;
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unw_context_t uc;
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int count = 0;
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printf ("caught signal %d\n", signal);
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unw_getcontext (&uc);
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unw_init_local (&cursor, &uc);
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while (!unw_is_signal_frame (&cursor))
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if (unw_step (&cursor) < 0)
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panic ("failed to find signal frame!\n");
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unw_step (&cursor);
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do
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{
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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printf ("ip = %lx\n", (long) ip);
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++count;
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}
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while (unw_step (&cursor) > 0);
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if (count != 13)
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panic ("FAILURE: expected 13, not %d frames below signal frame\n", count);
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printf ("SUCCESS\n");
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exit (0);
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}
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int
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main (int argc, char *argv[])
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{
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unw_dyn_region_info_t *region;
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unw_dyn_info_t di;
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struct fdesc fdesc;
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template_t funcp;
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void *mem;
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mem = malloc (getpagesize ());
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get_fdesc (fdesc, template);
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printf ("old code @ %p, new code @ %p\n", (void *) fdesc.code, mem);
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memcpy (mem, (void *) fdesc.code, 256);
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mprotect ((void *) ((long) mem & ~(getpagesize () - 1)),
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2*getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC);
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flush_cache (mem, 256);
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signal (SIGSEGV, sighandler);
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/* register the new function: */
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region = alloca (_U_dyn_region_info_size (2));
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region->next = NULL;
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region->insn_count = 256;
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region->op_count = 2;
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_U_dyn_op_alias (®ion->op[0], 0, -1, fdesc.code);
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_U_dyn_op_stop (®ion->op[1]);
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memset (&di, 0, sizeof (di));
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di.start_ip = (long) mem;
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di.end_ip = (long) mem + 256;
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di.gp = fdesc.gp;
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di.format = UNW_INFO_FORMAT_DYNAMIC;
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di.u.pi.name_ptr = (unw_word_t) "copy_of_template";
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di.u.pi.regions = region;
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_U_dyn_register (&di);
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/* call new function: */
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fdesc.code = (long) mem;
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funcp = get_funcp (fdesc);
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(*funcp) (10, funcp, printf, "iteration %c%s\n", strarr);
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_U_dyn_cancel (&di);
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return -1;
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}
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