diff options
Diffstat (limited to 'lib/librtld_db/rtld_db.c')
| -rw-r--r-- | lib/librtld_db/rtld_db.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/lib/librtld_db/rtld_db.c b/lib/librtld_db/rtld_db.c new file mode 100644 index 0000000..fef8d46 --- /dev/null +++ b/lib/librtld_db/rtld_db.c @@ -0,0 +1,226 @@ +/* + * Copyright (c) 2010 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Rui Paulo under sponsorship from the + * FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <machine/_inttypes.h> +#include <sys/types.h> +#include <sys/user.h> + +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <libproc.h> +#include <libutil.h> + +#include "rtld_db.h" + +static int _librtld_db_debug = 0; +#define DPRINTF(...) do { \ + if (_librtld_db_debug) { \ + fprintf(stderr, "librtld_db: DEBUG: "); \ + fprintf(stderr, __VA_ARGS__); \ + } \ +} while (0) + +void +rd_delete(rd_agent_t *rdap) +{ + + free(rdap); +} + +const char * +rd_errstr(rd_err_e rderr) +{ + + switch (rderr) { + case RD_ERR: + return "generic error"; + case RD_OK: + return "no error"; + case RD_NOCAPAB: + return "capability not supported"; + case RD_DBERR: + return "database error"; + case RD_NOBASE: + return "NOBASE"; + case RD_NOMAPS: + return "NOMAPS"; + default: + return "unknown error"; + } +} + +rd_err_e +rd_event_addr(rd_agent_t *rdap, rd_event_e event __unused, rd_notify_t *notify) +{ + DPRINTF("%s rdap %p notify %p\n", __func__, rdap, notify); + + notify->type = RD_NOTIFY_BPT; + notify->u.bptaddr = rdap->rda_addr; + + return (RD_OK); +} + +rd_err_e +rd_event_enable(rd_agent_t *rdap __unused, int onoff) +{ + DPRINTF("%s onoff %d\n", __func__, onoff); + + return (RD_OK); +} + +rd_err_e +rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg) +{ + DPRINTF("%s\n", __func__); + + msg->type = RD_POSTINIT; + msg->u.state = RD_CONSISTENT; + + return (RD_OK); +} + +rd_err_e +rd_init(int version) +{ + char *debug = NULL; + + if (version == RD_VERSION) { + debug = getenv("LIBRTLD_DB_DEBUG"); + _librtld_db_debug = debug ? atoi(debug) : 0; + return (RD_OK); + } else + return (RD_NOCAPAB); +} + +rd_err_e +rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data) +{ + int cnt, i, lastvn = 0; + rd_loadobj_t rdl; + struct kinfo_vmentry *kves, *kve; + + DPRINTF("%s\n", __func__); + + if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) { + warn("ERROR: kinfo_getvmmap() failed"); + return (RD_ERR); + } + for (i = 0; i < cnt; i++) { + kve = kves + i; + if (kve->kve_type == KVME_TYPE_VNODE) + lastvn = i; + memset(&rdl, 0, sizeof(rdl)); + /* + * Map the kinfo_vmentry struct to the rd_loadobj structure. + */ + rdl.rdl_saddr = kve->kve_start; + rdl.rdl_eaddr = kve->kve_end; + rdl.rdl_offset = kve->kve_offset; + if (kve->kve_protection & KVME_PROT_READ) + rdl.rdl_prot |= RD_RDL_R; + if (kve->kve_protection & KVME_PROT_WRITE) + rdl.rdl_prot |= RD_RDL_W; + if (kve->kve_protection & KVME_PROT_EXEC) + rdl.rdl_prot |= RD_RDL_X; + strlcpy(rdl.rdl_path, kves[lastvn].kve_path, + sizeof(rdl.rdl_path)); + (*cb)(&rdl, clnt_data); + } + free(kves); + + return (RD_OK); +} + +void +rd_log(const int onoff) +{ + DPRINTF("%s\n", __func__); + + (void)onoff; +} + +rd_agent_t * +rd_new(struct proc_handle *php) +{ + rd_agent_t *rdap; + + rdap = malloc(sizeof(rd_agent_t)); + if (rdap) { + memset(rdap, 0, sizeof(rd_agent_t)); + rdap->rda_php = php; + rd_reset(rdap); + } + + return (rdap); +} + +rd_err_e +rd_objpad_enable(rd_agent_t *rdap, size_t padsize) +{ + DPRINTF("%s\n", __func__); + + (void)rdap; + (void)padsize; + + return (RD_ERR); +} + +rd_err_e +rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc, + uintptr_t plt_base, rd_plt_info_t *rpi) +{ + DPRINTF("%s\n", __func__); + + (void)rdap; + (void)pc; + (void)proc; + (void)plt_base; + (void)rpi; + + return (RD_ERR); +} + +rd_err_e +rd_reset(rd_agent_t *rdap) +{ + GElf_Sym sym; + + if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state", + &sym) < 0) + return (RD_ERR); + DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value); + rdap->rda_addr = sym.st_value; + + return (RD_OK); +} |
