From a1cd19081de1772276b58b6edd9fa0f0abafb0c4 Mon Sep 17 00:00:00 2001 From: Nicholas Duffek Date: Sat, 26 May 2001 00:52:15 +0000 Subject: [PATCH] * Makefile.in (osfsolib.c, osfsolib.o): Rename to solib-osf.c and solib-osf.o. * config/alpha/alpha-osf1.mh (NATDEPFILES): Replace osfsolib.o with solib-osf.o and solib.o. * config/alpha/alpha-osf2.mh: Likewise. * config/alpha/alpha-osf3.mh: Likewise. * solib-osf.c: New file, renamed and largely rewritten from osfsolib.c. --- gdb/ChangeLog | 11 + gdb/Makefile.in | 6 +- gdb/config/alpha/alpha-osf1.mh | 3 +- gdb/config/alpha/alpha-osf2.mh | 3 +- gdb/config/alpha/alpha-osf3.mh | 4 +- gdb/solib-osf.c | 611 +++++++++++++++++++++++++++++++++ 6 files changed, 631 insertions(+), 7 deletions(-) create mode 100644 gdb/solib-osf.c diff --git a/gdb/ChangeLog b/gdb/ChangeLog index bda56c64c94..e20163a0ca8 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,14 @@ +2001-05-25 Nick Duffek + + * Makefile.in (osfsolib.c, osfsolib.o): Rename to solib-osf.c and + solib-osf.o. + * config/alpha/alpha-osf1.mh (NATDEPFILES): Replace osfsolib.o + with solib-osf.o and solib.o. + * config/alpha/alpha-osf2.mh: Likewise. + * config/alpha/alpha-osf3.mh: Likewise. + * solib-osf.c: New file, renamed and largely rewritten from + osfsolib.c. + 2001-05-25 Michael Snyder * remote.c (remote_write_bytes): Update 'p' packet pointer. diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 6735215d428..6049ab46201 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -1163,7 +1163,7 @@ ALLDEPFILES = 29k-share/udi/udip2soc.c 29k-share/udi/udr.c \ mips-tdep.c mipsm3-nat.c mipsv4-nat.c news-xdep.c \ nindy-share/Onindy.c nindy-share/nindy.c \ nindy-share/ttyflush.c nindy-tdep.c \ - ns32k-tdep.c osfsolib.c \ + ns32k-tdep.c solib-osf.c \ somread.c somsolib.c $(HPREAD_SOURCE) \ ppc-linux-nat.c ppc-linux-tdep.c \ procfs.c \ @@ -1730,8 +1730,8 @@ ns32k-tdep.o: ns32k-tdep.c $(bfd_h) $(dis-asm_h) $(defs_h) objfiles.o: objfiles.c $(bfd_h) $(defs_h) objfiles.h symfile.h \ $(symtab_h) $(gdb_string_h) $(breakpoint_h) -osfsolib.o: osfsolib.c $(command_h) $(defs_h) $(gdbcore_h) $(inferior_h) \ - objfiles.h gnu-regex.h symfile.h target.h language.h $(gdb_string_h) +solib-osf.o: solib-osf.c $(defs_h) $(inferior_h) $(symtab_h) objfiles.h \ + $(symfile_h) $(target_h) $(gdb_string_h) solist.h somread.o: somread.c $(bfd_h) buildsym.h complaints.h $(defs_h) \ gdb-stabs.h objfiles.h symfile.h $(symtab_h) $(gdb_string_h) diff --git a/gdb/config/alpha/alpha-osf1.mh b/gdb/config/alpha/alpha-osf1.mh index 6ed0f95ffcf..62654e8c00c 100644 --- a/gdb/config/alpha/alpha-osf1.mh +++ b/gdb/config/alpha/alpha-osf1.mh @@ -2,4 +2,5 @@ XDEPFILES= XM_FILE= xm-alphaosf.h NAT_FILE= nm-osf.h -NATDEPFILES= infptrace.o inftarg.o corelow.o alpha-nat.o fork-child.o osfsolib.o +NATDEPFILES= infptrace.o inftarg.o corelow.o alpha-nat.o fork-child.o \ + solib-osf.o solib.o diff --git a/gdb/config/alpha/alpha-osf2.mh b/gdb/config/alpha/alpha-osf2.mh index bb200d8236e..8b4d841c960 100644 --- a/gdb/config/alpha/alpha-osf2.mh +++ b/gdb/config/alpha/alpha-osf2.mh @@ -3,4 +3,5 @@ XDEPFILES= XM_FILE= xm-alphaosf.h NAT_FILE= nm-osf2.h NATDEPFILES= infptrace.o inftarg.o corelow.o alpha-nat.o fork-child.o \ - osfsolib.o procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o + solib-osf.o solib.o procfs.o proc-api.o proc-events.o proc-flags.o \ + proc-why.o diff --git a/gdb/config/alpha/alpha-osf3.mh b/gdb/config/alpha/alpha-osf3.mh index 6af28084d66..1ad20856a8b 100644 --- a/gdb/config/alpha/alpha-osf3.mh +++ b/gdb/config/alpha/alpha-osf3.mh @@ -3,5 +3,5 @@ XDEPFILES= XM_FILE= xm-alphaosf.h NAT_FILE= nm-osf3.h NATDEPFILES= infptrace.o inftarg.o corelow.o alpha-nat.o fork-child.o \ - osfsolib.o procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o - + solib-osf.o solib.o procfs.o proc-api.o proc-events.o proc-flags.o \ + proc-why.o diff --git a/gdb/solib-osf.c b/gdb/solib-osf.c new file mode 100644 index 00000000000..805254f5383 --- /dev/null +++ b/gdb/solib-osf.c @@ -0,0 +1,611 @@ +/* Handle OSF/1, Digital UNIX, and Tru64 shared libraries + for GDB, the GNU Debugger. + Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001 + Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* When handling shared libraries, GDB has to find out the pathnames + of all shared libraries that are currently loaded (to read in their + symbols) and where the shared libraries are loaded in memory + (to relocate them properly from their prelinked addresses to the + current load address). + + Under OSF/1 there are two possibilities to get at this information: + + 1) Peek around in the runtime loader structures. + These are not documented, and they are not defined in the system + header files. The definitions below were obtained by experimentation, + but they seem stable enough. + + 2) Use the libxproc.a library, which contains the equivalent ldr_* + routines. The library is documented in Tru64 5.x, but as of 5.1, it + only allows a process to examine itself. On earlier versions, it + may require that the GDB executable be dynamically linked and that + NAT_CLIBS include -lxproc -Wl,-expect_unresolved,ldr_process_context + for GDB and all applications that are using libgdb. + + We will use the peeking approach until libxproc.a works for other + processes. */ + +#include "defs.h" + +#include +#include +#include "gdb_string.h" + +#include "bfd.h" +#include "symtab.h" +#include "symfile.h" +#include "objfiles.h" +#include "target.h" +#include "inferior.h" +#include "solist.h" + +#ifdef USE_LDR_ROUTINES +# include +#endif + +#ifndef USE_LDR_ROUTINES +/* Definition of runtime loader structures, found by experimentation. */ +#define RLD_CONTEXT_ADDRESS 0x3ffc0000000 + +/* Per-module information structure referenced by ldr_context_t.head. */ + +typedef struct + { + CORE_ADDR next; + CORE_ADDR previous; + CORE_ADDR unknown1; + CORE_ADDR module_name; + CORE_ADDR modinfo_addr; /* used by next_link_map_member() to detect + the end of the shared module list */ + long module_id; + CORE_ADDR unknown2; + CORE_ADDR unknown3; + long region_count; + CORE_ADDR regioninfo_addr; + } +ldr_module_info_t; + +/* Per-region structure referenced by ldr_module_info_t.regioninfo_addr. */ + +typedef struct + { + long unknown1; + CORE_ADDR regionname_addr; + long protection; + CORE_ADDR vaddr; + CORE_ADDR mapaddr; + long size; + long unknown2[5]; + } +ldr_region_info_t; + +/* Structure at RLD_CONTEXT_ADDRESS specifying the start and finish addresses + of the shared module list. */ + +typedef struct + { + CORE_ADDR unknown1; + CORE_ADDR unknown2; + CORE_ADDR head; + CORE_ADDR tail; + } +ldr_context_t; +#endif /* !USE_LDR_ROUTINES */ + +/* Per-section information, stored in struct lm_info.secs. */ + +struct lm_sec + { + CORE_ADDR offset; /* difference between default and actual + virtual addresses of section .name */ + CORE_ADDR nameaddr; /* address in inferior of section name */ + const char *name; /* name of section, null if not fetched */ + }; + +/* Per-module information, stored in struct so_list.lm_info. */ + +struct lm_info + { + int isloader; /* whether the module is /sbin/loader */ + int nsecs; /* length of .secs */ + struct lm_sec secs[1]; /* variable-length array of sections, sorted + by name */ + }; + +/* Context for iterating through the inferior's shared module list. */ + +struct read_map_ctxt + { +#ifdef USE_LDR_ROUTINES + ldr_process_t proc; + ldr_module_t next; +#else + CORE_ADDR next; /* next element in module list */ + CORE_ADDR tail; /* last element in module list */ +#endif + }; + +/* Forward declaration for this module's autoinit function. */ + +extern void _initialize_osf_solib (void); + +#ifdef USE_LDR_ROUTINES +# if 0 +/* This routine is intended to be called by ldr_* routines to read memory from + the current target. Usage: + + ldr_process = ldr_core_process (); + ldr_set_core_reader (ldr_read_memory); + ldr_xdetach (ldr_process); + ldr_xattach (ldr_process); + + ldr_core_process() and ldr_read_memory() are neither documented nor + declared in system header files. They work with OSF/1 2.x, and they might + work with later versions as well. */ + +static int +ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring) +{ + int result; + char *buffer; + + if (readstring) + { + target_read_string (memaddr, &buffer, len, &result); + if (result == 0) + strcpy (myaddr, buffer); + xfree (buffer); + } + else + result = target_read_memory (memaddr, myaddr, len); + + if (result != 0) + result = -result; + return result; +} +# endif /* 0 */ +#endif /* USE_LDR_ROUTINES */ + +/* Comparison for qsort() and bsearch(): return -1, 0, or 1 according to + whether lm_sec *P1's name is lexically less than, equal to, or greater + than that of *P2. */ + +static int +lm_sec_cmp (const void *p1, const void *p2) +{ + const struct lm_sec *lms1 = p1, *lms2 = p2; + return strcmp (lms1->name, lms2->name); +} + +/* Sort LMI->secs so that osf_relocate_section_addresses() can binary-search + it. */ + +static void +lm_secs_sort (struct lm_info *lmi) +{ + qsort (lmi->secs, lmi->nsecs, sizeof *lmi->secs, lm_sec_cmp); +} + +/* Populate name fields of LMI->secs. */ + +static void +fetch_sec_names (struct lm_info *lmi) +{ +#ifndef USE_LDR_ROUTINES + int i, errcode; + struct lm_sec *lms; + char *name; + + for (i = 0; i < lmi->nsecs; i++) + { + lms = lmi->secs + i; + target_read_string (lms->nameaddr, &name, PATH_MAX, &errcode); + if (errcode != 0) + { + warning ("unable to read shared sec name at 0x%lx", lms->nameaddr); + name = xstrdup (""); + } + lms->name = name; + } + lm_secs_sort (lmi); +#endif +} + +/* target_so_ops callback. Adjust SEC's addresses after it's been mapped into + the process. */ + +static void +osf_relocate_section_addresses (struct so_list *so, + struct section_table *sec) +{ + struct lm_info *lmi; + struct lm_sec lms_key, *lms; + + /* Fetch SO's section names if we haven't done so already. */ + lmi = so->lm_info; + if (lmi->nsecs && !lmi->secs[0].name) + fetch_sec_names (lmi); + + /* Binary-search for offset information corresponding to SEC. */ + lms_key.name = sec->the_bfd_section->name; + lms = bsearch (&lms_key, lmi->secs, lmi->nsecs, sizeof *lms, lm_sec_cmp); + if (lms) + { + sec->addr += lms->offset; + sec->endaddr += lms->offset; + } +} + +/* target_so_ops callback. Free parts of SO allocated by this file. */ + +static void +osf_free_so (struct so_list *so) +{ + int i; + const char *name; + + for (i = 0; i < so->lm_info->nsecs; i++) + { + name = so->lm_info->secs[i].name; + if (name) + xfree ((void *) name); + } + xfree (so->lm_info); +} + +/* target_so_ops callback. Discard information accumulated by this file and + not freed by osf_free_so(). */ + +static void +osf_clear_solib (void) +{ + return; +} + +/* target_so_ops callback. Prepare to handle shared libraries after the + inferior process has been created but before it's executed any + instructions. + + For a statically bound executable, the inferior's first instruction is the + one at "_start", or a similar text label. No further processing is needed + in that case. + + For a dynamically bound executable, this first instruction is somewhere + in the rld, and the actual user executable is not yet mapped in. + We continue the inferior again, rld then maps in the actual user + executable and any needed shared libraries and then sends + itself a SIGTRAP. + + At that point we discover the names of all shared libraries and + read their symbols in. + + FIXME + + This code does not properly handle hitting breakpoints which the + user might have set in the rld itself. Proper handling would have + to check if the SIGTRAP happened due to a kill call. + + Also, what if child has exit()ed? Must exit loop somehow. */ + +static void +osf_solib_create_inferior_hook (void) +{ + /* Nothing to do for statically bound executables. */ + + if (symfile_objfile == NULL + || symfile_objfile->obfd == NULL + || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0)) + return; + + /* Now run the target. It will eventually get a SIGTRAP, at + which point all of the libraries will have been mapped in and we + can go groveling around in the rld structures to find + out what we need to know about them. */ + + clear_proceed_status (); + stop_soon_quietly = 1; + stop_signal = TARGET_SIGNAL_0; + do + { + target_resume (minus_one_ptid, 0, stop_signal); + wait_for_inferior (); + } + while (stop_signal != TARGET_SIGNAL_TRAP); + + /* solib_add will call reinit_frame_cache. + But we are stopped in the runtime loader and we do not have symbols + for the runtime loader. So heuristic_proc_start will be called + and will put out an annoying warning. + Delaying the resetting of stop_soon_quietly until after symbol loading + suppresses the warning. */ + if (auto_solib_add) + solib_add ((char *) 0, 0, (struct target_ops *) 0); + stop_soon_quietly = 0; + + /* Enable breakpoints disabled (unnecessarily) by clear_solib(). */ + re_enable_breakpoints_in_shlibs (); +} + +/* target_so_ops callback. Do additional symbol handling, lookup, etc. after + symbols for a shared object have been loaded. */ + +static void +osf_special_symbol_handling (void) +{ + return; +} + +/* Initialize CTXT in preparation for iterating through the inferior's module + list using read_map(). Return success. */ + +static int +open_map (struct read_map_ctxt *ctxt) +{ +#ifdef USE_LDR_ROUTINES + ctxt->proc = ldr_my_process (); + if (ldr_xattach (ctxt->proc) != 0) + return 0; + ctxt->next = LDR_NULL_MODULE; +#else + CORE_ADDR ldr_context_addr, prev, next; + ldr_context_t ldr_context; + + if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, + (char *) &ldr_context_addr, + sizeof (CORE_ADDR)) != 0) + return 0; + if (target_read_memory (ldr_context_addr, + (char *) &ldr_context, + sizeof (ldr_context_t)) != 0) + return 0; + ctxt->next = ldr_context.head; + ctxt->tail = ldr_context.tail; +#endif + return 1; +} + +/* Initialize SO to have module NAME, /sbin/loader indicator ISLOADR, and + space for NSECS sections. */ + +static void +init_so (struct so_list *so, char *name, int isloader, int nsecs) +{ + int namelen, i; + + /* solib.c requires various fields to be initialized to 0. */ + memset (so, 0, sizeof *so); + + /* Copy the name. */ + namelen = strlen (name); + if (namelen >= SO_NAME_MAX_PATH_SIZE) + namelen = SO_NAME_MAX_PATH_SIZE - 1; + + memcpy (so->so_original_name, name, namelen); + so->so_original_name[namelen] = '\0'; + memcpy (so->so_name, so->so_original_name, namelen + 1); + + /* Allocate section space. */ + so->lm_info = xmalloc ((unsigned) &(((struct lm_info *)0)->secs) + + nsecs * sizeof *so->lm_info); + so->lm_info->isloader = isloader; + so->lm_info->nsecs = nsecs; + for (i = 0; i < nsecs; i++) + so->lm_info->secs[i].name = NULL; +} + +/* Initialize SO's section SECIDX with name address NAMEADDR, name string + NAME, default virtual address VADDR, and actual virtual address + MAPADDR. */ + +static void +init_sec (struct so_list *so, int secidx, CORE_ADDR nameaddr, + const char *name, CORE_ADDR vaddr, CORE_ADDR mapaddr) +{ + struct lm_sec *lms; + + lms = so->lm_info->secs + secidx; + lms->nameaddr = nameaddr; + lms->name = name; + lms->offset = mapaddr - vaddr; +} + +/* If there are more elements starting at CTXT in inferior's module list, + store the next element in SO, advance CTXT to the next element, and return + 1, else return 0. */ + +static int +read_map (struct read_map_ctxt *ctxt, struct so_list *so) +{ + ldr_module_info_t minf; + ldr_region_info_t rinf; + +#ifdef USE_LDR_ROUTINES + size_t size; + ldr_region_t i; + + /* Retrieve the next element. */ + if (ldr_next_module (ctxt->proc, &ctxt->next) != 0) + return 0; + if (ctxt->next == LDR_NULL_MODULE) + return 0; + if (ldr_inq_module (ctxt->proc, ctxt->next, &minf, sizeof minf, &size) != 0) + return 0; + + /* Initialize the module name and section count. */ + init_so (so, minf.lmi_name, 0, minf.lmi_nregion); + + /* Retrieve section names and offsets. */ + for (i = 0; i < minf.lmi_nregion; i++) + { + if (ldr_inq_region (ctxt->proc, ctxt->next, i, &rinf, + sizeof rinf, &size) != 0) + goto err; + init_sec (so, (int) i, 0, xstrdup (rinf.lri_name), + (CORE_ADDR) rinf.lri_vaddr, (CORE_ADDR) rinf.lri_mapaddr); + } + lm_secs_sort (so->lm_info); +#else + char *name; + int errcode, i; + + /* Retrieve the next element. */ + if (!ctxt->next) + return 0; + if (target_read_memory (ctxt->next, (char *) &minf, sizeof minf) != 0) + return 0; + if (ctxt->next == ctxt->tail) + ctxt->next = 0; + else + ctxt->next = minf.next; + + /* Initialize the module name and section count. */ + target_read_string (minf.module_name, &name, PATH_MAX, &errcode); + if (errcode != 0) + return 0; + init_so (so, name, !minf.modinfo_addr, minf.region_count); + xfree (name); + + /* Retrieve section names and offsets. */ + for (i = 0; i < minf.region_count; i++) + { + if (target_read_memory (minf.regioninfo_addr + i * sizeof rinf, + (char *) &rinf, sizeof rinf) != 0) + goto err; + init_sec (so, i, rinf.regionname_addr, NULL, rinf.vaddr, rinf.mapaddr); + } +#endif /* !USE_LDR_ROUTINES */ + return 1; + + err: + osf_free_so (so); + return 0; +} + +/* Free resources allocated by open_map (CTXT). */ + +static void +close_map (struct read_map_ctxt *ctxt) +{ +#ifdef USE_LDR_ROUTINES + ldr_xdetach (ctxt->proc); +#endif +} + +/* target_so_ops callback. Return a list of shared objects currently loaded + in the inferior. */ + +static struct so_list * +osf_current_sos (void) +{ + struct so_list *head = NULL, *tail, *newtail, so; + struct read_map_ctxt ctxt; + int skipped_main; + + if (!open_map (&ctxt)) + return NULL; + + /* Read subsequent elements. */ + for (skipped_main = 0;;) + { + if (!read_map (&ctxt, &so)) + break; + + /* Skip the main program module, which is first in the list after + /sbin/loader. */ + if (!so.lm_info->isloader && !skipped_main) + { + osf_free_so (&so); + skipped_main = 1; + continue; + } + + newtail = xmalloc (sizeof *newtail); + if (!head) + head = newtail; + else + tail->next = newtail; + tail = newtail; + + memcpy (tail, &so, sizeof so); + tail->next = NULL; + } + + done: + close_map (&ctxt); + return head; +} + +/* target_so_ops callback. Attempt to locate and open the main symbol + file. */ + +static int +osf_open_symbol_file_object (void *from_ttyp) +{ + struct read_map_ctxt ctxt; + struct so_list so; + int found; + + if (symfile_objfile) + if (!query ("Attempt to reload symbols from process? ")) + return 0; + + /* The first module after /sbin/loader is the main program. */ + if (!open_map (&ctxt)) + return 0; + for (found = 0; !found;) + { + if (!read_map (&ctxt, &so)) + break; + found = !so.lm_info->isloader; + osf_free_so (&so); + } + close_map (&ctxt); + + if (found) + symbol_file_add_main (so.so_name, *(int *) from_ttyp); + return found; +} + +/* target_so_ops callback. Return whether PC is in the dynamic linker. */ + +static int +osf_in_dynsym_resolve_code (CORE_ADDR pc) +{ + return 0; +} + +static struct target_so_ops osf_so_ops; + +void +_initialize_osf_solib (void) +{ + osf_so_ops.relocate_section_addresses = osf_relocate_section_addresses; + osf_so_ops.free_so = osf_free_so; + osf_so_ops.clear_solib = osf_clear_solib; + osf_so_ops.solib_create_inferior_hook = osf_solib_create_inferior_hook; + osf_so_ops.special_symbol_handling = osf_special_symbol_handling; + osf_so_ops.current_sos = osf_current_sos; + osf_so_ops.open_symbol_file_object = osf_open_symbol_file_object; + osf_so_ops.in_dynsym_resolve_code = osf_in_dynsym_resolve_code; + + /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ + current_target_so_ops = &osf_so_ops; +} -- 2.30.2