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#include "flush-cache.h"
#include <assert.h>
#include <libunwind.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
int verbose;
#ifdef __ia64__
# define GET_ENTRY(fdesc) (((uintptr_t *) (fdesc))[0])
# define GET_GP(fdesc) (((uintptr_t *) (fdesc))[0])
# define EXTRA 16
#else
# define GET_ENTRY(fdesc) ((uintptr_t ) (fdesc))
# define GET_GP(fdesc) (0)
# define EXTRA 0
#endif
int
make_executable (void *addr, size_t len)
{
if (mprotect ((void *) (((long) addr) & -getpagesize ()), len,
PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
{
perror ("mprotect");
return -1;
}
flush_cache (addr, len);
return 0;
}
void *
create_func (unw_dyn_info_t *di, const char *name, long (*func) (),
void *end, unw_dyn_region_info_t *region)
{
void *mem, *memend, *addr, *fptr;
unw_word_t gp = 0;
size_t len;
len = (uintptr_t) end - GET_ENTRY (func) + EXTRA;
mem = malloc (len);
if (verbose)
printf ("%s: cloning %s at %p (%zu bytes)\n",
__FUNCTION__, name, mem, len);
memend = (char *) mem + len;
#ifdef __ia64__
addr = (void *) GET_ENTRY (func);
/* build function descriptor: */
((long *) mem)[0] = (long) mem + 16; /* entry point */
((long *) mem)[1] = GET_GP (func); /* global-pointer */
fptr = mem;
mem = (void *) ((long) mem + 16);
#else
fptr = mem;
#endif
len = (char *) memend - (char *) mem;
memcpy (mem, addr, len);
if (make_executable (mem, len) < 0)
return NULL;
if (di)
{
memset (di, 0, sizeof (*di));
di->start_ip = (unw_word_t) mem;
di->end_ip = (unw_word_t) memend;
di->gp = gp;
di->format = UNW_INFO_FORMAT_DYNAMIC;
di->u.pi.name_ptr = (unw_word_t) name;
di->u.pi.regions = region;
}
return fptr;
}
int
main (int argc, char **argv)
{
extern long func_add1 (long);
extern char func_add1_end[];
extern long func_add3 (long, long (*[])());
extern char func_add3_end[];
extern long func_vframe (long);
extern char func_vframe_end[];
unw_dyn_region_info_t *r_pro, *r_epi, *r, *rtmp;
unw_dyn_info_t di0, di1, di2, di3;
long (*add1) (long);
long (*add3_0) (long);
long (*add3_1) (long, void *[]);
long (*vframe) (long);
void *flist[2];
long ret;
int i;
signal (SIGUSR1, SIG_IGN);
signal (SIGUSR2, SIG_IGN);
if (argc != 1)
verbose = 1;
add1 = (long (*)(long))
create_func (&di0, "func_add1", func_add1, func_add1_end, NULL);
/* Describe the epilogue of func_add3: */
i = 0;
r_epi = alloca (_U_dyn_region_info_size (5));
r_epi->op_count = 5;
r_epi->next = NULL;
r_epi->insn_count = -9;
_U_dyn_op_pop_frames (&r_epi->op[i++],
_U_QP_TRUE, /* when=*/ 5, /* num_frames=*/ 1);
_U_dyn_op_stop (&r_epi->op[i++]);
assert ((unsigned) i <= r_epi->op_count);
/* Describe the prologue of func_add3: */
i = 0;
r_pro = alloca (_U_dyn_region_info_size (4));
r_pro->op_count = 4;
r_pro->next = r_epi;
r_pro->insn_count = 8;
_U_dyn_op_save_reg (&r_pro->op[i++], _U_QP_TRUE, /* when=*/ 0,
/* reg=*/ UNW_IA64_AR_PFS, /* dst=*/ UNW_IA64_GR + 34);
_U_dyn_op_add (&r_pro->op[i++], _U_QP_TRUE, /* when=*/ 2,
/* reg= */ UNW_IA64_SP, /* val=*/ -16);
_U_dyn_op_save_reg (&r_pro->op[i++], _U_QP_TRUE, /* when=*/ 4,
/* reg=*/ UNW_IA64_RP, /* dst=*/ UNW_IA64_GR + 3);
_U_dyn_op_spill_sp_rel (&r_pro->op[i++], _U_QP_TRUE, /* when=*/ 7,
/* reg=*/ UNW_IA64_RP, /* off=*/ 16);
assert ((unsigned) i <= r_pro->op_count);
/* Create regions for func_vframe: */
i = 0;
r = alloca (_U_dyn_region_info_size (16));
r->op_count = 16;
r->next = NULL;
r->insn_count = 4;
_U_dyn_op_label_state (&r->op[i++], /* label=*/ 100402);
_U_dyn_op_pop_frames (&r->op[i++], _U_QP_TRUE, /* when=*/ 3, /* frames=*/ 1);
_U_dyn_op_stop (&r->op[i++]);
assert ((unsigned) i <= r->op_count);
i = 0;
rtmp = r;
r = alloca (_U_dyn_region_info_size (16));
r->op_count = 16;
r->next = rtmp;
r->insn_count = 16;
_U_dyn_op_save_reg (&r->op[i++], _U_QP_TRUE, /* when=*/ 8,
/* reg=*/ UNW_IA64_RP, /* dst=*/ UNW_IA64_GR + 3);
_U_dyn_op_pop_frames (&r->op[i++], _U_QP_TRUE, /* when=*/ 10,
/* num_frames=*/ 1);
_U_dyn_op_stop (&r->op[i++]);
assert ((unsigned) i <= r->op_count);
i = 0;
rtmp = r;
r = alloca (_U_dyn_region_info_size (16));
r->op_count = 16;
r->next = rtmp;
r->insn_count = 5;
_U_dyn_op_save_reg (&r->op[i++], _U_QP_TRUE, /* when=*/ 1,
/* reg=*/ UNW_IA64_RP, /* dst=*/ UNW_IA64_GR + 33);
_U_dyn_op_save_reg (&r->op[i++], _U_QP_TRUE, /* when=*/ 2,
/* reg=*/ UNW_IA64_SP, /* dst=*/ UNW_IA64_GR + 34);
_U_dyn_op_spill_fp_rel (&r->op[i++], _U_QP_TRUE, /* when=*/ 4,
/* reg=*/ UNW_IA64_AR_PFS, /* off=*/ 16);
_U_dyn_op_label_state (&r->op[i++], /* label=*/ 100402);
_U_dyn_op_stop (&r->op[i++]);
assert ((unsigned) i <= r->op_count);
/* Create two functions which can share the region-list: */
add3_0 = (long (*) (long))
create_func (&di1, "func_add3/0", func_add3, func_add3_end, r_pro);
add3_1 = (long (*) (long, void *[]))
create_func (&di2, "func_add3/1", func_add3, func_add3_end, r_pro);
vframe = (long (*) (long))
create_func (&di3, "func_vframe", func_vframe, func_vframe_end, r);
_U_dyn_register (&di1);
_U_dyn_register (&di2);
_U_dyn_register (&di3);
_U_dyn_register (&di0);
flist[0] = add3_0;
flist[1] = add1;
kill (getpid (), SIGUSR1); /* do something ptmon can latch onto */
ret = (*add3_1) (13, flist);
if (ret != 18)
{
fprintf (stderr, "FAILURE: (*add3_1)(13) returned %ld\n", ret);
exit (-1);
}
ret = (*vframe) (48);
if (ret != 4)
{
fprintf (stderr, "FAILURE: (*vframe)(16) returned %ld\n", ret);
exit (-1);
}
ret = (*vframe) (64);
if (ret != 10)
{
fprintf (stderr, "FAILURE: (*vframe)(32) returned %ld\n", ret);
exit (-1);
}
kill (getpid (), SIGUSR2); /* do something ptmon can latch onto */
_U_dyn_cancel (&di0);
_U_dyn_cancel (&di1);
_U_dyn_cancel (&di3);
_U_dyn_cancel (&di2);
return 0;
}
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