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When our linker merges .SUNW_dof sections from multiple files, it simply

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concatenates the DOF tables into one section. Previously, the USDT init
code in drti.o would only look at the first table in the DOF section; with
this change, it iterates over all the tables, passing each DOF table to
the kernel.

PR:		186821
Submitted by:	Fedor Indutny <fedor@indutny.com>
MFC after:	1 month
This commit is contained in:
Mark Johnston 2014-03-01 23:09:07 +00:00
parent c3b76e1345
commit 44c25a3d82
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=262669
1 changed files with 58 additions and 30 deletions
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88
cddl/contrib/opensolaris/lib/libdtrace/common/drti.c
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@ -20,6 +20,7 @@
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Copyright 2013 Voxer Inc. All rights reserved.
* Use is subject to license terms.
*/
@ -144,7 +145,8 @@ dtrace_dof_init(void)
Lmid_t lmid;
#else
u_long lmid = 0;
dof_sec_t *sec;
dof_sec_t *sec, *secstart, *dofstrtab, *dofprobes;
dof_provider_t *dofprovider;
size_t i;
#endif
int fd;
@ -152,14 +154,15 @@ dtrace_dof_init(void)
#if !defined(sun)
Elf *e;
Elf_Scn *scn = NULL;
Elf_Data *symtabdata = NULL, *dynsymdata = NULL;
Elf_Data *symtabdata = NULL, *dynsymdata = NULL, *dofdata = NULL;
dof_hdr_t *dof_next = NULL;
GElf_Shdr shdr;
int efd, nprobes;
char *s;
char *dofstrtabraw;
size_t shstridx, symtabidx = 0, dynsymidx = 0;
unsigned char *dofstrtab = NULL;
unsigned char *buf;
int fixedprobes = 0;
int fixedprobes;
#endif
if (getenv("DTRACE_DOF_INIT_DISABLE") != NULL)
@ -209,7 +212,8 @@ dtrace_dof_init(void)
} else if (shdr.sh_type == SHT_PROGBITS) {
s = elf_strptr(e, shstridx, shdr.sh_name);
if (s && strcmp(s, ".SUNW_dof") == 0) {
dof = elf_getdata(scn, NULL)->d_buf;
dofdata = elf_getdata(scn, NULL);
dof = dofdata->d_buf;
}
}
}
@ -219,6 +223,10 @@ dtrace_dof_init(void)
close(efd);
return;
}
while ((char *) dof < (char *) dofdata->d_buf + dofdata->d_size) {
fixedprobes = 0;
dof_next = (void *) ((char *) dof + dof->dofh_filesz);
#endif
if (dof->dofh_ident[DOF_ID_MAG0] != DOF_MAG_MAG0 ||
@ -290,34 +298,49 @@ dtrace_dof_init(void)
* We are assuming the number of probes is less than the number of
* symbols (libc can have 4k symbols, for example).
*/
sec = (dof_sec_t *)(dof + 1);
secstart = sec = (dof_sec_t *)(dof + 1);
buf = (char *)dof;
for (i = 0; i < dof->dofh_secnum; i++, sec++) {
if (sec->dofs_type == DOF_SECT_STRTAB)
dofstrtab = (unsigned char *)(buf + sec->dofs_offset);
else if (sec->dofs_type == DOF_SECT_PROBES && dofstrtab)
if (sec->dofs_type != DOF_SECT_PROVIDER)
continue;
dofprovider = (void *) (buf + sec->dofs_offset);
dofstrtab = secstart + dofprovider->dofpv_strtab;
dofprobes = secstart + dofprovider->dofpv_probes;
if (dofstrtab->dofs_type != DOF_SECT_STRTAB) {
fprintf(stderr, "WARNING: expected STRTAB section, but got %d\n",
dofstrtab->dofs_type);
break;
}
nprobes = sec->dofs_size / sec->dofs_entsize;
fixsymbol(e, symtabdata, symtabidx, nprobes, buf, sec, &fixedprobes,
dofstrtab);
if (fixedprobes != nprobes) {
/*
* If we haven't fixed all the probes using the
* symtab section, look inside the dynsym
* section.
*/
fixsymbol(e, dynsymdata, dynsymidx, nprobes, buf, sec,
&fixedprobes, dofstrtab);
}
if (fixedprobes != nprobes) {
fprintf(stderr, "WARNING: number of probes "
"fixed does not match the number of "
"defined probes (%d != %d, "
"respectively)\n", fixedprobes, nprobes);
fprintf(stderr, "WARNING: some probes might "
"not fire or your program might crash\n");
}
if (dofprobes->dofs_type != DOF_SECT_PROBES) {
fprintf(stderr, "WARNING: expected PROBES section, but got %d\n",
dofprobes->dofs_type);
break;
}
dprintf(1, "found provider %p\n", dofprovider);
dofstrtabraw = (char *)(buf + dofstrtab->dofs_offset);
nprobes = dofprobes->dofs_size / dofprobes->dofs_entsize;
fixsymbol(e, symtabdata, symtabidx, nprobes, buf, dofprobes, &fixedprobes,
dofstrtabraw);
if (fixedprobes != nprobes) {
/*
* If we haven't fixed all the probes using the
* symtab section, look inside the dynsym
* section.
*/
fixsymbol(e, dynsymdata, dynsymidx, nprobes, buf, dofprobes,
&fixedprobes, dofstrtabraw);
}
if (fixedprobes != nprobes) {
fprintf(stderr, "WARNING: number of probes "
"fixed does not match the number of "
"defined probes (%d != %d, "
"respectively)\n", fixedprobes, nprobes);
fprintf(stderr, "WARNING: some probes might "
"not fire or your program might crash\n");
}
}
#endif
if ((gen = ioctl(fd, DTRACEHIOC_ADDDOF, &dh)) == -1)
@ -330,7 +353,12 @@ dtrace_dof_init(void)
}
(void) close(fd);
#if !defined(sun)
/* End of while loop */
dof = dof_next;
}
elf_end(e);
(void) close(efd);
#endif