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Diffstat (limited to 'gdb/irix5-nat.c')
| -rw-r--r-- | gdb/irix5-nat.c | 1349 |
1 files changed, 1349 insertions, 0 deletions
diff --git a/gdb/irix5-nat.c b/gdb/irix5-nat.c new file mode 100644 index 00000000000..b3373a99168 --- /dev/null +++ b/gdb/irix5-nat.c @@ -0,0 +1,1349 @@ +/* Native support for the SGI Iris running IRIX version 5, for GDB. + Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 98, 1999 + Free Software Foundation, Inc. + Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU + and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. + Implemented for Irix 4.x by Garrett A. Wollman. + Modified for Irix 5.x by Ian Lance Taylor. + +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. */ + +#include "defs.h" +#include "inferior.h" +#include "gdbcore.h" +#include "target.h" + +#include "gdb_string.h" +#include <sys/time.h> +#include <sys/procfs.h> +#include <setjmp.h> /* For JB_XXX. */ + +static void +fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR)); + +/* Size of elements in jmpbuf */ + +#define JB_ELEMENT_SIZE 4 + +/* + * See the comment in m68k-tdep.c regarding the utility of these functions. + * + * These definitions are from the MIPS SVR4 ABI, so they may work for + * any MIPS SVR4 target. + */ + +void +supply_gregset (gregsetp) + gregset_t *gregsetp; +{ + register int regi; + register greg_t *regp = &(*gregsetp)[0]; + int gregoff = sizeof (greg_t) - MIPS_REGSIZE; + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + + for(regi = 0; regi <= CTX_RA; regi++) + supply_register (regi, (char *)(regp + regi) + gregoff); + + supply_register (PC_REGNUM, (char *)(regp + CTX_EPC) + gregoff); + supply_register (HI_REGNUM, (char *)(regp + CTX_MDHI) + gregoff); + supply_register (LO_REGNUM, (char *)(regp + CTX_MDLO) + gregoff); + supply_register (CAUSE_REGNUM, (char *)(regp + CTX_CAUSE) + gregoff); + + /* Fill inaccessible registers with zero. */ + supply_register (BADVADDR_REGNUM, zerobuf); +} + +void +fill_gregset (gregsetp, regno) + gregset_t *gregsetp; + int regno; +{ + int regi; + register greg_t *regp = &(*gregsetp)[0]; + + /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32 + executable, we have to sign extend the registers to 64 bits before + filling in the gregset structure. */ + + for (regi = 0; regi <= CTX_RA; regi++) + if ((regno == -1) || (regno == regi)) + *(regp + regi) = + extract_signed_integer (®isters[REGISTER_BYTE (regi)], + REGISTER_RAW_SIZE (regi)); + + if ((regno == -1) || (regno == PC_REGNUM)) + *(regp + CTX_EPC) = + extract_signed_integer (®isters[REGISTER_BYTE (PC_REGNUM)], + REGISTER_RAW_SIZE (PC_REGNUM)); + + if ((regno == -1) || (regno == CAUSE_REGNUM)) + *(regp + CTX_CAUSE) = + extract_signed_integer (®isters[REGISTER_BYTE (CAUSE_REGNUM)], + REGISTER_RAW_SIZE (CAUSE_REGNUM)); + + if ((regno == -1) || (regno == HI_REGNUM)) + *(regp + CTX_MDHI) = + extract_signed_integer (®isters[REGISTER_BYTE (HI_REGNUM)], + REGISTER_RAW_SIZE (HI_REGNUM)); + + if ((regno == -1) || (regno == LO_REGNUM)) + *(regp + CTX_MDLO) = + extract_signed_integer (®isters[REGISTER_BYTE (LO_REGNUM)], + REGISTER_RAW_SIZE (LO_REGNUM)); +} + +/* + * Now we do the same thing for floating-point registers. + * We don't bother to condition on FP0_REGNUM since any + * reasonable MIPS configuration has an R3010 in it. + * + * Again, see the comments in m68k-tdep.c. + */ + +void +supply_fpregset (fpregsetp) + fpregset_t *fpregsetp; +{ + register int regi; + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + + /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ + + for (regi = 0; regi < 32; regi++) + supply_register (FP0_REGNUM + regi, + (char *)&fpregsetp->fp_r.fp_regs[regi]); + + supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); + + /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ + supply_register (FCRIR_REGNUM, zerobuf); +} + +void +fill_fpregset (fpregsetp, regno) + fpregset_t *fpregsetp; + int regno; +{ + int regi; + char *from, *to; + + /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ + + for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) + { + if ((regno == -1) || (regno == regi)) + { + from = (char *) ®isters[REGISTER_BYTE (regi)]; + to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); + memcpy(to, from, REGISTER_RAW_SIZE (regi)); + } + } + + if ((regno == -1) || (regno == FCRCS_REGNUM)) + fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; +} + + +/* Figure out where the longjmp will land. + We expect the first arg to be a pointer to the jmp_buf structure from which + we extract the pc (JB_PC) that we will land at. The pc is copied into PC. + This routine returns true on success. */ + +int +get_longjmp_target (pc) + CORE_ADDR *pc; +{ + char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; + CORE_ADDR jb_addr; + + jb_addr = read_register (A0_REGNUM); + + if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, + TARGET_PTR_BIT / TARGET_CHAR_BIT)) + return 0; + + *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); + + return 1; +} + +static void +fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) + char *core_reg_sect; + unsigned core_reg_size; + int which; /* Unused */ + CORE_ADDR reg_addr; /* Unused */ +{ + if (core_reg_size == REGISTER_BYTES) + { + memcpy ((char *)registers, core_reg_sect, core_reg_size); + } + else if (MIPS_REGSIZE == 4 && + core_reg_size == (2 * MIPS_REGSIZE) * NUM_REGS) + { + /* This is a core file from a N32 executable, 64 bits are saved + for all registers. */ + char *srcp = core_reg_sect; + char *dstp = registers; + int regno; + + for (regno = 0; regno < NUM_REGS; regno++) + { + if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32)) + { + /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB + currently assumes that they are 32 bit. */ + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + if (REGISTER_RAW_SIZE(regno) == 4) + { + /* copying 4 bytes from eight bytes? + I don't see how this can be right... */ + srcp += 4; + } + else + { + /* copy all 8 bytes (sizeof(double)) */ + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + } + } + else + { + srcp += 4; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + *dstp++ = *srcp++; + } + } + } + else + { + warning ("wrong size gregset struct in core file"); + return; + } + + registers_fetched (); +} + +/* Irix 5 uses what appears to be a unique form of shared library + support. This is a copy of solib.c modified for Irix 5. */ +/* FIXME: Most of this code could be merged with osfsolib.c and solib.c + by using next_link_map_member and xfer_link_map_member in solib.c. */ + +#include <sys/types.h> +#include <signal.h> +#include <sys/param.h> +#include <fcntl.h> + +/* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts + with our versions of those files included by tm-mips.h. Prevent + <obj.h> from including them with some appropriate defines. */ +#define __SYM_H__ +#define __SYMCONST_H__ +#include <obj.h> +#ifdef HAVE_OBJLIST_H +#include <objlist.h> +#endif + +#ifdef NEW_OBJ_INFO_MAGIC +#define HANDLE_NEW_OBJ_LIST +#endif + +#include "symtab.h" +#include "bfd.h" +#include "symfile.h" +#include "objfiles.h" +#include "command.h" +#include "frame.h" +#include "gnu-regex.h" +#include "inferior.h" +#include "language.h" +#include "gdbcmd.h" + +/* The symbol which starts off the list of shared libraries. */ +#define DEBUG_BASE "__rld_obj_head" + +/* Irix 6.x introduces a new variant of object lists. + To be able to debug O32 executables under Irix 6, we have to handle both + variants. */ + +typedef enum +{ + OBJ_LIST_OLD, /* Pre Irix 6.x object list. */ + OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */ + OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */ +} obj_list_variant; + +/* Define our own link_map structure. + This will help to share code with osfsolib.c and solib.c. */ + +struct link_map { + obj_list_variant l_variant; /* which variant of object list */ + CORE_ADDR l_lladdr; /* addr in inferior list was read from */ + CORE_ADDR l_next; /* address of next object list entry */ +}; + +/* Irix 5 shared objects are pre-linked to particular addresses + although the dynamic linker may have to relocate them if the + address ranges of the libraries used by the main program clash. + The offset is the difference between the address where the object + is mapped and the binding address of the shared library. */ +#define LM_OFFSET(so) ((so) -> offset) +/* Loaded address of shared library. */ +#define LM_ADDR(so) ((so) -> lmstart) + +char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ + +struct so_list { + struct so_list *next; /* next structure in linked list */ + struct link_map lm; + CORE_ADDR offset; /* prelink to load address offset */ + char *so_name; /* shared object lib name */ + CORE_ADDR lmstart; /* lower addr bound of mapped object */ + CORE_ADDR lmend; /* upper addr bound of mapped object */ + char symbols_loaded; /* flag: symbols read in yet? */ + char from_tty; /* flag: print msgs? */ + struct objfile *objfile; /* objfile for loaded lib */ + struct section_table *sections; + struct section_table *sections_end; + struct section_table *textsection; + bfd *abfd; +}; + +static struct so_list *so_list_head; /* List of known shared objects */ +static CORE_ADDR debug_base; /* Base of dynamic linker structures */ +static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ + +/* Local function prototypes */ + +static void +sharedlibrary_command PARAMS ((char *, int)); + +static int +enable_break PARAMS ((void)); + +static int +disable_break PARAMS ((void)); + +static void +info_sharedlibrary_command PARAMS ((char *, int)); + +static int +symbol_add_stub PARAMS ((char *)); + +static struct so_list * +find_solib PARAMS ((struct so_list *)); + +static struct link_map * +first_link_map_member PARAMS ((void)); + +static struct link_map * +next_link_map_member PARAMS ((struct so_list *)); + +static void +xfer_link_map_member PARAMS ((struct so_list *, struct link_map *)); + +static CORE_ADDR +locate_base PARAMS ((void)); + +static int +solib_map_sections PARAMS ((char *)); + +/* + +LOCAL FUNCTION + + solib_map_sections -- open bfd and build sections for shared lib + +SYNOPSIS + + static int solib_map_sections (struct so_list *so) + +DESCRIPTION + + Given a pointer to one of the shared objects in our list + of mapped objects, use the recorded name to open a bfd + descriptor for the object, build a section table, and then + relocate all the section addresses by the base address at + which the shared object was mapped. + +FIXMES + + In most (all?) cases the shared object file name recorded in the + dynamic linkage tables will be a fully qualified pathname. For + cases where it isn't, do we really mimic the systems search + mechanism correctly in the below code (particularly the tilde + expansion stuff?). + */ + +static int +solib_map_sections (arg) + char *arg; +{ + struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ + char *filename; + char *scratch_pathname; + int scratch_chan; + struct section_table *p; + struct cleanup *old_chain; + bfd *abfd; + + filename = tilde_expand (so -> so_name); + old_chain = make_cleanup (free, filename); + + scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, + &scratch_pathname); + if (scratch_chan < 0) + { + scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, + O_RDONLY, 0, &scratch_pathname); + } + if (scratch_chan < 0) + { + perror_with_name (filename); + } + /* Leave scratch_pathname allocated. abfd->name will point to it. */ + + abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); + if (!abfd) + { + close (scratch_chan); + error ("Could not open `%s' as an executable file: %s", + scratch_pathname, bfd_errmsg (bfd_get_error ())); + } + /* Leave bfd open, core_xfer_memory and "info files" need it. */ + so -> abfd = abfd; + abfd -> cacheable = true; + + if (!bfd_check_format (abfd, bfd_object)) + { + error ("\"%s\": not in executable format: %s.", + scratch_pathname, bfd_errmsg (bfd_get_error ())); + } + if (build_section_table (abfd, &so -> sections, &so -> sections_end)) + { + error ("Can't find the file sections in `%s': %s", + bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); + } + + for (p = so -> sections; p < so -> sections_end; p++) + { + /* Relocate the section binding addresses as recorded in the shared + object's file by the offset to get the address to which the + object was actually mapped. */ + p -> addr += LM_OFFSET (so); + p -> endaddr += LM_OFFSET (so); + so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); + if (STREQ (p -> the_bfd_section -> name, ".text")) + { + so -> textsection = p; + } + } + + /* Free the file names, close the file now. */ + do_cleanups (old_chain); + + return (1); +} + +/* + +LOCAL FUNCTION + + locate_base -- locate the base address of dynamic linker structs + +SYNOPSIS + + CORE_ADDR locate_base (void) + +DESCRIPTION + + For both the SunOS and SVR4 shared library implementations, if the + inferior executable has been linked dynamically, there is a single + address somewhere in the inferior's data space which is the key to + locating all of the dynamic linker's runtime structures. This + address is the value of the symbol defined by the macro DEBUG_BASE. + The job of this function is to find and return that address, or to + return 0 if there is no such address (the executable is statically + linked for example). + + For SunOS, the job is almost trivial, since the dynamic linker and + all of it's structures are statically linked to the executable at + link time. Thus the symbol for the address we are looking for has + already been added to the minimal symbol table for the executable's + objfile at the time the symbol file's symbols were read, and all we + have to do is look it up there. Note that we explicitly do NOT want + to find the copies in the shared library. + + The SVR4 version is much more complicated because the dynamic linker + and it's structures are located in the shared C library, which gets + run as the executable's "interpreter" by the kernel. We have to go + to a lot more work to discover the address of DEBUG_BASE. Because + of this complexity, we cache the value we find and return that value + on subsequent invocations. Note there is no copy in the executable + symbol tables. + + Irix 5 is basically like SunOS. + + Note that we can assume nothing about the process state at the time + we need to find this address. We may be stopped on the first instruc- + tion of the interpreter (C shared library), the first instruction of + the executable itself, or somewhere else entirely (if we attached + to the process for example). + + */ + +static CORE_ADDR +locate_base () +{ + struct minimal_symbol *msymbol; + CORE_ADDR address = 0; + + msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile); + if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) + { + address = SYMBOL_VALUE_ADDRESS (msymbol); + } + return (address); +} + +/* + +LOCAL FUNCTION + + first_link_map_member -- locate first member in dynamic linker's map + +SYNOPSIS + + static struct link_map *first_link_map_member (void) + +DESCRIPTION + + Read in a copy of the first member in the inferior's dynamic + link map from the inferior's dynamic linker structures, and return + a pointer to the link map descriptor. +*/ + +static struct link_map * +first_link_map_member () +{ + struct obj_list *listp; + struct obj_list list_old; + struct link_map *lm; + static struct link_map first_lm; + CORE_ADDR lladdr; + CORE_ADDR next_lladdr; + + /* We have not already read in the dynamic linking structures + from the inferior, lookup the address of the base structure. */ + debug_base = locate_base (); + if (debug_base == 0) + return NULL; + + /* Get address of first list entry. */ + read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *)); + + if (listp == NULL) + return NULL; + + /* Get first list entry. */ + lladdr = (CORE_ADDR) listp; + read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); + + /* The first entry in the list is the object file we are debugging, + so skip it. */ + next_lladdr = (CORE_ADDR) list_old.next; + +#ifdef HANDLE_NEW_OBJ_LIST + if (list_old.data == NEW_OBJ_INFO_MAGIC) + { + Elf32_Obj_Info list_32; + + read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); + if (list_32.oi_size != sizeof (Elf32_Obj_Info)) + return NULL; + next_lladdr = (CORE_ADDR) list_32.oi_next; + } +#endif + + if (next_lladdr == 0) + return NULL; + + first_lm.l_lladdr = next_lladdr; + lm = &first_lm; + return lm; +} + +/* + +LOCAL FUNCTION + + next_link_map_member -- locate next member in dynamic linker's map + +SYNOPSIS + + static struct link_map *next_link_map_member (so_list_ptr) + +DESCRIPTION + + Read in a copy of the next member in the inferior's dynamic + link map from the inferior's dynamic linker structures, and return + a pointer to the link map descriptor. +*/ + +static struct link_map * +next_link_map_member (so_list_ptr) + struct so_list *so_list_ptr; +{ + struct link_map *lm = &so_list_ptr -> lm; + CORE_ADDR next_lladdr = lm -> l_next; + static struct link_map next_lm; + + if (next_lladdr == 0) + { + /* We have hit the end of the list, so check to see if any were + added, but be quiet if we can't read from the target any more. */ + int status = 0; + + if (lm -> l_variant == OBJ_LIST_OLD) + { + struct obj_list list_old; + + status = target_read_memory (lm -> l_lladdr, + (char *) &list_old, + sizeof (struct obj_list)); + next_lladdr = (CORE_ADDR) list_old.next; + } +#ifdef HANDLE_NEW_OBJ_LIST + else if (lm -> l_variant == OBJ_LIST_32) + { + Elf32_Obj_Info list_32; + status = target_read_memory (lm -> l_lladdr, + (char *) &list_32, + sizeof (Elf32_Obj_Info)); + next_lladdr = (CORE_ADDR) list_32.oi_next; + } +#endif + + if (status != 0 || next_lladdr == 0) + return NULL; + } + + next_lm.l_lladdr = next_lladdr; + lm = &next_lm; + return lm; +} + +/* + +LOCAL FUNCTION + + xfer_link_map_member -- set local variables from dynamic linker's map + +SYNOPSIS + + static void xfer_link_map_member (so_list_ptr, lm) + +DESCRIPTION + + Read in a copy of the requested member in the inferior's dynamic + link map from the inferior's dynamic linker structures, and fill + in the necessary so_list_ptr elements. +*/ + +static void +xfer_link_map_member (so_list_ptr, lm) + struct so_list *so_list_ptr; + struct link_map *lm; +{ + struct obj_list list_old; + CORE_ADDR lladdr = lm -> l_lladdr; + struct link_map *new_lm = &so_list_ptr -> lm; + int errcode; + + read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); + + new_lm -> l_variant = OBJ_LIST_OLD; + new_lm -> l_lladdr = lladdr; + new_lm -> l_next = (CORE_ADDR) list_old.next; + +#ifdef HANDLE_NEW_OBJ_LIST + if (list_old.data == NEW_OBJ_INFO_MAGIC) + { + Elf32_Obj_Info list_32; + + read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); + if (list_32.oi_size != sizeof (Elf32_Obj_Info)) + return; + new_lm -> l_variant = OBJ_LIST_32; + new_lm -> l_next = (CORE_ADDR) list_32.oi_next; + + target_read_string ((CORE_ADDR) list_32.oi_pathname, + &so_list_ptr -> so_name, + list_32.oi_pathname_len + 1, &errcode); + if (errcode != 0) + memory_error (errcode, (CORE_ADDR) list_32.oi_pathname); + + LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr; + LM_OFFSET (so_list_ptr) = + (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr; + } + else +#endif + { +#if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32 + /* If we are compiling GDB under N32 ABI, the alignments in + the obj struct are different from the O32 ABI and we will get + wrong values when accessing the struct. + As a workaround we use fixed values which are good for + Irix 6.2. */ + char buf[432]; + + read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf)); + + target_read_string (extract_address (&buf[236], 4), + &so_list_ptr -> so_name, + INT_MAX, &errcode); + if (errcode != 0) + memory_error (errcode, extract_address (&buf[236], 4)); + + LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4); + LM_OFFSET (so_list_ptr) = + extract_address (&buf[196], 4) - extract_address (&buf[248], 4); +#else + struct obj obj_old; + + read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old, + sizeof (struct obj)); + + target_read_string ((CORE_ADDR) obj_old.o_path, + &so_list_ptr -> so_name, + INT_MAX, &errcode); + if (errcode != 0) + memory_error (errcode, (CORE_ADDR) obj_old.o_path); + + LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw; + LM_OFFSET (so_list_ptr) = + (CORE_ADDR) obj_old.o_praw - obj_old.o_base_address; +#endif + } + + catch_errors (solib_map_sections, (char *) so_list_ptr, + "Error while mapping shared library sections:\n", + RETURN_MASK_ALL); +} + + +/* + +LOCAL FUNCTION + + find_solib -- step through list of shared objects + +SYNOPSIS + + struct so_list *find_solib (struct so_list *so_list_ptr) + +DESCRIPTION + + This module contains the routine which finds the names of any + loaded "images" in the current process. The argument in must be + NULL on the first call, and then the returned value must be passed + in on subsequent calls. This provides the capability to "step" down + the list of loaded objects. On the last object, a NULL value is + returned. + */ + +static struct so_list * +find_solib (so_list_ptr) + struct so_list *so_list_ptr; /* Last lm or NULL for first one */ +{ + struct so_list *so_list_next = NULL; + struct link_map *lm = NULL; + struct so_list *new; + + if (so_list_ptr == NULL) + { + /* We are setting up for a new scan through the loaded images. */ + if ((so_list_next = so_list_head) == NULL) + { + /* Find the first link map list member. */ + lm = first_link_map_member (); + } + } + else + { + /* We have been called before, and are in the process of walking + the shared library list. Advance to the next shared object. */ + lm = next_link_map_member (so_list_ptr); + so_list_next = so_list_ptr -> next; + } + if ((so_list_next == NULL) && (lm != NULL)) + { + new = (struct so_list *) xmalloc (sizeof (struct so_list)); + memset ((char *) new, 0, sizeof (struct so_list)); + /* Add the new node as the next node in the list, or as the root + node if this is the first one. */ + if (so_list_ptr != NULL) + { + so_list_ptr -> next = new; + } + else + { + so_list_head = new; + } + so_list_next = new; + xfer_link_map_member (new, lm); + } + return (so_list_next); +} + +/* A small stub to get us past the arg-passing pinhole of catch_errors. */ + +static int +symbol_add_stub (arg) + char *arg; +{ + register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ + CORE_ADDR text_addr = 0; + + if (so -> textsection) + text_addr = so -> textsection -> addr; + else if (so -> abfd != NULL) + { + asection *lowest_sect; + + /* If we didn't find a mapped non zero sized .text section, set up + text_addr so that the relocation in symbol_file_add does no harm. */ + + lowest_sect = bfd_get_section_by_name (so -> abfd, ".text"); + if (lowest_sect == NULL) + bfd_map_over_sections (so -> abfd, find_lowest_section, + (PTR) &lowest_sect); + if (lowest_sect) + text_addr = bfd_section_vma (so -> abfd, lowest_sect) + LM_OFFSET (so); + } + + so -> objfile = symbol_file_add (so -> so_name, so -> from_tty, + text_addr, + 0, 0, 0, 0, 0); + return (1); +} + +/* + +GLOBAL FUNCTION + + solib_add -- add a shared library file to the symtab and section list + +SYNOPSIS + + void solib_add (char *arg_string, int from_tty, + struct target_ops *target) + +DESCRIPTION + +*/ + +void +solib_add (arg_string, from_tty, target) + char *arg_string; + int from_tty; + struct target_ops *target; +{ + register struct so_list *so = NULL; /* link map state variable */ + + /* Last shared library that we read. */ + struct so_list *so_last = NULL; + + char *re_err; + int count; + int old; + + if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) + { + error ("Invalid regexp: %s", re_err); + } + + /* Add the shared library sections to the section table of the + specified target, if any. */ + if (target) + { + /* Count how many new section_table entries there are. */ + so = NULL; + count = 0; + while ((so = find_solib (so)) != NULL) + { + if (so -> so_name[0]) + { + count += so -> sections_end - so -> sections; + } + } + + if (count) + { + int update_coreops; + + /* We must update the to_sections field in the core_ops structure + here, otherwise we dereference a potential dangling pointer + for each call to target_read/write_memory within this routine. */ + update_coreops = core_ops.to_sections == target->to_sections; + + /* Reallocate the target's section table including the new size. */ + if (target -> to_sections) + { + old = target -> to_sections_end - target -> to_sections; + target -> to_sections = (struct section_table *) + xrealloc ((char *)target -> to_sections, + (sizeof (struct section_table)) * (count + old)); + } + else + { + old = 0; + target -> to_sections = (struct section_table *) + xmalloc ((sizeof (struct section_table)) * count); + } + target -> to_sections_end = target -> to_sections + (count + old); + + /* Update the to_sections field in the core_ops structure + if needed. */ + if (update_coreops) + { + core_ops.to_sections = target->to_sections; + core_ops.to_sections_end = target->to_sections_end; + } + + /* Add these section table entries to the target's table. */ + while ((so = find_solib (so)) != NULL) + { + if (so -> so_name[0]) + { + count = so -> sections_end - so -> sections; + memcpy ((char *) (target -> to_sections + old), + so -> sections, + (sizeof (struct section_table)) * count); + old += count; + } + } + } + } + + /* Now add the symbol files. */ + while ((so = find_solib (so)) != NULL) + { + if (so -> so_name[0] && re_exec (so -> so_name)) + { + so -> from_tty = from_tty; + if (so -> symbols_loaded) + { + if (from_tty) + { + printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); + } + } + else if (catch_errors + (symbol_add_stub, (char *) so, + "Error while reading shared library symbols:\n", + RETURN_MASK_ALL)) + { + so_last = so; + so -> symbols_loaded = 1; + } + } + } + + /* Getting new symbols may change our opinion about what is + frameless. */ + if (so_last) + reinit_frame_cache (); +} + +/* + +LOCAL FUNCTION + + info_sharedlibrary_command -- code for "info sharedlibrary" + +SYNOPSIS + + static void info_sharedlibrary_command () + +DESCRIPTION + + Walk through the shared library list and print information + about each attached library. +*/ + +static void +info_sharedlibrary_command (ignore, from_tty) + char *ignore; + int from_tty; +{ + register struct so_list *so = NULL; /* link map state variable */ + int header_done = 0; + + if (exec_bfd == NULL) + { + printf_unfiltered ("No exec file.\n"); + return; + } + while ((so = find_solib (so)) != NULL) + { + if (so -> so_name[0]) + { + if (!header_done) + { + printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", + "Shared Object Library"); + header_done++; + } + printf_unfiltered ("%-12s", + local_hex_string_custom ((unsigned long) LM_ADDR (so), + "08l")); + printf_unfiltered ("%-12s", + local_hex_string_custom ((unsigned long) so -> lmend, + "08l")); + printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); + printf_unfiltered ("%s\n", so -> so_name); + } + } + if (so_list_head == NULL) + { + printf_unfiltered ("No shared libraries loaded at this time.\n"); + } +} + +/* + +GLOBAL FUNCTION + + solib_address -- check to see if an address is in a shared lib + +SYNOPSIS + + char *solib_address (CORE_ADDR address) + +DESCRIPTION + + Provides a hook for other gdb routines to discover whether or + not a particular address is within the mapped address space of + a shared library. Any address between the base mapping address + and the first address beyond the end of the last mapping, is + considered to be within the shared library address space, for + our purposes. + + For example, this routine is called at one point to disable + breakpoints which are in shared libraries that are not currently + mapped in. + */ + +char * +solib_address (address) + CORE_ADDR address; +{ + register struct so_list *so = 0; /* link map state variable */ + + while ((so = find_solib (so)) != NULL) + { + if (so -> so_name[0]) + { + if ((address >= (CORE_ADDR) LM_ADDR (so)) && + (address < (CORE_ADDR) so -> lmend)) + return (so->so_name); + } + } + return (0); +} + +/* Called by free_all_symtabs */ + +void +clear_solib() +{ + struct so_list *next; + char *bfd_filename; + + disable_breakpoints_in_shlibs (1); + + while (so_list_head) + { + if (so_list_head -> sections) + { + free ((PTR)so_list_head -> sections); + } + if (so_list_head -> abfd) + { + bfd_filename = bfd_get_filename (so_list_head -> abfd); + if (!bfd_close (so_list_head -> abfd)) + warning ("cannot close \"%s\": %s", + bfd_filename, bfd_errmsg (bfd_get_error ())); + } + else + /* This happens for the executable on SVR4. */ + bfd_filename = NULL; + + next = so_list_head -> next; + if (bfd_filename) + free ((PTR)bfd_filename); + free (so_list_head->so_name); + free ((PTR)so_list_head); + so_list_head = next; + } + debug_base = 0; +} + +/* + +LOCAL FUNCTION + + disable_break -- remove the "mapping changed" breakpoint + +SYNOPSIS + + static int disable_break () + +DESCRIPTION + + Removes the breakpoint that gets hit when the dynamic linker + completes a mapping change. + +*/ + +static int +disable_break () +{ + int status = 1; + + + /* Note that breakpoint address and original contents are in our address + space, so we just need to write the original contents back. */ + + if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) + { + status = 0; + } + + /* For the SVR4 version, we always know the breakpoint address. For the + SunOS version we don't know it until the above code is executed. + Grumble if we are stopped anywhere besides the breakpoint address. */ + + if (stop_pc != breakpoint_addr) + { + warning ("stopped at unknown breakpoint while handling shared libraries"); + } + + return (status); +} + +/* + +LOCAL FUNCTION + + enable_break -- arrange for dynamic linker to hit breakpoint + +SYNOPSIS + + int enable_break (void) + +DESCRIPTION + + This functions inserts a breakpoint at the entry point of the + main executable, where all shared libraries are mapped in. +*/ + +static int +enable_break () +{ + if (symfile_objfile != NULL + && target_insert_breakpoint (symfile_objfile->ei.entry_point, + shadow_contents) == 0) + { + breakpoint_addr = symfile_objfile->ei.entry_point; + return 1; + } + + return 0; +} + +/* + +GLOBAL FUNCTION + + solib_create_inferior_hook -- shared library startup support + +SYNOPSIS + + void solib_create_inferior_hook() + +DESCRIPTION + + When gdb starts up the inferior, it nurses it along (through the + shell) until it is ready to execute it's first instruction. At this + point, this function gets called via expansion of the macro + SOLIB_CREATE_INFERIOR_HOOK. + + For SunOS executables, this first instruction is typically the + one at "_start", or a similar text label, regardless of whether + the executable is statically or dynamically linked. The runtime + startup code takes care of dynamically linking in any shared + libraries, once gdb allows the inferior to continue. + + For SVR4 executables, this first instruction is either the first + instruction in the dynamic linker (for dynamically linked + executables) or the instruction at "start" for statically linked + executables. For dynamically linked executables, the system + first exec's /lib/libc.so.N, which contains the dynamic linker, + and starts it running. The dynamic linker maps in any needed + shared libraries, maps in the actual user executable, and then + jumps to "start" in the user executable. + + For both SunOS shared libraries, and SVR4 shared libraries, we + can arrange to cooperate with the dynamic linker to discover the + names of shared libraries that are dynamically linked, and the + base addresses to which they are linked. + + This function is responsible for discovering those names and + addresses, and saving sufficient information about them to allow + their symbols to be read at a later time. + +FIXME + + Between enable_break() and disable_break(), this code does not + properly handle hitting breakpoints which the user might have + set in the startup code or in the dynamic linker itself. Proper + handling will probably have to wait until the implementation is + changed to use the "breakpoint handler function" method. + + Also, what if child has exit()ed? Must exit loop somehow. + */ + +void +solib_create_inferior_hook() +{ + if (!enable_break ()) + { + warning ("shared library handler failed to enable breakpoint"); + return; + } + + /* Now run the target. It will eventually hit the breakpoint, at + which point all of the libraries will have been mapped in and we + can go groveling around in the dynamic linker 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 (-1, 0, stop_signal); + wait_for_inferior (); + } + while (stop_signal != TARGET_SIGNAL_TRAP); + + /* We are now either at the "mapping complete" breakpoint (or somewhere + else, a condition we aren't prepared to deal with anyway), so adjust + the PC as necessary after a breakpoint, disable the breakpoint, and + add any shared libraries that were mapped in. */ + + if (DECR_PC_AFTER_BREAK) + { + stop_pc -= DECR_PC_AFTER_BREAK; + write_register (PC_REGNUM, stop_pc); + } + + if (!disable_break ()) + { + warning ("shared library handler failed to disable breakpoint"); + } + + /* solib_add will call reinit_frame_cache. + But we are stopped in the startup code and we might not have symbols + for the startup code, so heuristic_proc_start could 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; +} + +/* + +LOCAL FUNCTION + + sharedlibrary_command -- handle command to explicitly add library + +SYNOPSIS + + static void sharedlibrary_command (char *args, int from_tty) + +DESCRIPTION + +*/ + +static void +sharedlibrary_command (args, from_tty) +char *args; +int from_tty; +{ + dont_repeat (); + solib_add (args, from_tty, (struct target_ops *) 0); +} + +void +_initialize_solib() +{ + add_com ("sharedlibrary", class_files, sharedlibrary_command, + "Load shared object library symbols for files matching REGEXP."); + add_info ("sharedlibrary", info_sharedlibrary_command, + "Status of loaded shared object libraries."); + + add_show_from_set + (add_set_cmd ("auto-solib-add", class_support, var_zinteger, + (char *) &auto_solib_add, + "Set autoloading of shared library symbols.\n\ +If nonzero, symbols from all shared object libraries will be loaded\n\ +automatically when the inferior begins execution or when the dynamic linker\n\ +informs gdb that a new library has been loaded. Otherwise, symbols\n\ +must be loaded manually, using `sharedlibrary'.", + &setlist), + &showlist); +} + + +/* Register that we are able to handle irix5 core file formats. + This really is bfd_target_unknown_flavour */ + +static struct core_fns irix5_core_fns = +{ + bfd_target_unknown_flavour, + fetch_core_registers, + NULL +}; + +void +_initialize_core_irix5 () +{ + add_core_fns (&irix5_core_fns); +} |