| /* xcoff.c -- Get debug data from an XCOFF file for backtraces. |
| Copyright (C) 2012-2021 Free Software Foundation, Inc. |
| Adapted from elf.c. |
| |
| 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. |
| |
| (3) The name of the author may not be used to |
| endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "config.h" |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| |
| #ifdef HAVE_LOADQUERY |
| #include <sys/ldr.h> |
| #endif |
| |
| #include "backtrace.h" |
| #include "internal.h" |
| |
| /* The configure script must tell us whether we are 32-bit or 64-bit |
| XCOFF. We could make this code test and support either possibility, |
| but there is no point. This code only works for the currently |
| running executable, which means that we know the XCOFF mode at |
| configure time. */ |
| |
| #if BACKTRACE_XCOFF_SIZE != 32 && BACKTRACE_XCOFF_SIZE != 64 |
| #error "Unknown BACKTRACE_XCOFF_SIZE" |
| #endif |
| |
| /* XCOFF file header. */ |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| |
| typedef struct { |
| uint16_t f_magic; |
| uint16_t f_nscns; |
| uint32_t f_timdat; |
| uint32_t f_symptr; |
| uint32_t f_nsyms; |
| uint16_t f_opthdr; |
| uint16_t f_flags; |
| } b_xcoff_filhdr; |
| |
| #define XCOFF_MAGIC 0737 |
| |
| #else /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| typedef struct { |
| uint16_t f_magic; |
| uint16_t f_nscns; |
| uint32_t f_timdat; |
| uint64_t f_symptr; |
| uint16_t f_opthdr; |
| uint16_t f_flags; |
| uint32_t f_nsyms; |
| } b_xcoff_filhdr; |
| |
| #define XCOFF_MAGIC 0767 |
| |
| #endif /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| #define F_SHROBJ 0x2000 /* File is a shared object. */ |
| |
| /* XCOFF section header. */ |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| |
| typedef struct { |
| char s_name[8]; |
| uint32_t s_paddr; |
| uint32_t s_vaddr; |
| uint32_t s_size; |
| uint32_t s_scnptr; |
| uint32_t s_relptr; |
| uint32_t s_lnnoptr; |
| uint16_t s_nreloc; |
| uint16_t s_nlnno; |
| uint32_t s_flags; |
| } b_xcoff_scnhdr; |
| |
| #define _OVERFLOW_MARKER 65535 |
| |
| #else /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| typedef struct { |
| char name[8]; |
| uint64_t s_paddr; |
| uint64_t s_vaddr; |
| uint64_t s_size; |
| uint64_t s_scnptr; |
| uint64_t s_relptr; |
| uint64_t s_lnnoptr; |
| uint32_t s_nreloc; |
| uint32_t s_nlnno; |
| uint32_t s_flags; |
| } b_xcoff_scnhdr; |
| |
| #endif /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| #define STYP_DWARF 0x10 /* DWARF debugging section. */ |
| #define STYP_TEXT 0x20 /* Executable text (code) section. */ |
| #define STYP_OVRFLO 0x8000 /* Line-number field overflow section. */ |
| |
| #define SSUBTYP_DWINFO 0x10000 /* DWARF info section. */ |
| #define SSUBTYP_DWLINE 0x20000 /* DWARF line-number section. */ |
| #define SSUBTYP_DWARNGE 0x50000 /* DWARF aranges section. */ |
| #define SSUBTYP_DWABREV 0x60000 /* DWARF abbreviation section. */ |
| #define SSUBTYP_DWSTR 0x70000 /* DWARF strings section. */ |
| #define SSUBTYP_DWRNGES 0x80000 /* DWARF ranges section. */ |
| |
| /* XCOFF symbol. */ |
| |
| #define SYMNMLEN 8 |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| |
| typedef struct { |
| union { |
| char _name[SYMNMLEN]; |
| struct { |
| uint32_t _zeroes; |
| uint32_t _offset; |
| } _s; |
| } _u; |
| #define n_name _u._name |
| #define n_zeroes _u._s._zeroes |
| #define n_offset_ _u._s._offset |
| |
| uint32_t n_value; |
| int16_t n_scnum; |
| uint16_t n_type; |
| uint8_t n_sclass; |
| uint8_t n_numaux; |
| } __attribute__ ((packed)) b_xcoff_syment; |
| |
| #else /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| typedef struct { |
| uint64_t n_value; |
| uint32_t n_offset_; |
| int16_t n_scnum; |
| uint16_t n_type; |
| uint8_t n_sclass; |
| uint8_t n_numaux; |
| } __attribute__ ((packed)) b_xcoff_syment; |
| |
| #endif /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| #define SYMESZ 18 |
| |
| #define C_EXT 2 /* External symbol. */ |
| #define C_FCN 101 /* Beginning or end of function. */ |
| #define C_FILE 103 /* Source file name. */ |
| #define C_HIDEXT 107 /* Unnamed external symbol. */ |
| #define C_BINCL 108 /* Beginning of include file. */ |
| #define C_EINCL 109 /* End of include file. */ |
| #define C_WEAKEXT 111 /* Weak external symbol. */ |
| |
| #define ISFCN(x) ((x) & 0x0020) |
| |
| /* XCOFF AUX entry. */ |
| |
| #define AUXESZ 18 |
| #define FILNMLEN 14 |
| |
| typedef union { |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| struct { |
| uint16_t pad; |
| uint16_t x_lnnohi; |
| uint16_t x_lnno; |
| } x_block; |
| #else |
| struct { |
| uint32_t x_lnno; |
| } x_block; |
| #endif |
| union { |
| char x_fname[FILNMLEN]; |
| struct { |
| uint32_t x_zeroes; |
| uint32_t x_offset; |
| char pad[FILNMLEN-8]; |
| uint8_t x_ftype; |
| } _x; |
| } x_file; |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| struct { |
| uint32_t x_exptr; |
| uint32_t x_fsize; |
| uint32_t x_lnnoptr; |
| uint32_t x_endndx; |
| } x_fcn; |
| #else |
| struct { |
| uint64_t x_lnnoptr; |
| uint32_t x_fsize; |
| uint32_t x_endndx; |
| } x_fcn; |
| #endif |
| struct { |
| uint8_t pad[AUXESZ-1]; |
| uint8_t x_auxtype; |
| } x_auxtype; |
| } __attribute__ ((packed)) b_xcoff_auxent; |
| |
| /* XCOFF line number entry. */ |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| |
| typedef struct { |
| union { |
| uint32_t l_symndx; |
| uint32_t l_paddr; |
| } l_addr; |
| uint16_t l_lnno; |
| } b_xcoff_lineno; |
| |
| #define LINESZ 6 |
| |
| #else /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| typedef struct { |
| union { |
| uint32_t l_symndx; |
| uint64_t l_paddr; |
| } l_addr; |
| uint32_t l_lnno; |
| } b_xcoff_lineno; |
| |
| #define LINESZ 12 |
| |
| #endif /* BACKTRACE_XCOFF_SIZE != 32 */ |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| #define XCOFF_AIX_TEXTBASE 0x10000000u |
| #else |
| #define XCOFF_AIX_TEXTBASE 0x100000000ul |
| #endif |
| |
| /* AIX big archive fixed-length header. */ |
| |
| #define AIAMAGBIG "<bigaf>\n" |
| |
| typedef struct { |
| char fl_magic[8]; /* Archive magic string. */ |
| char fl_memoff[20]; /* Offset to member table. */ |
| char fl_gstoff[20]; /* Offset to global symbol table. */ |
| char fl_gst64off[20]; /* Offset to global symbol table for 64-bit objects. */ |
| char fl_fstmoff[20]; /* Offset to first archive member. */ |
| char fl_freeoff[20]; /* Offset to first member on free list. */ |
| } b_ar_fl_hdr; |
| |
| /* AIX big archive file member header. */ |
| |
| typedef struct { |
| char ar_size[20]; /* File member size - decimal. */ |
| char ar_nxtmem[20]; /* Next member offset - decimal. */ |
| char ar_prvmem[20]; /* Previous member offset - decimal. */ |
| char ar_date[12]; /* File member date - decimal. */ |
| char ar_uid[12]; /* File member userid - decimal. */ |
| char ar_gid[12]; /* File member group id - decimal. */ |
| char ar_mode[12]; /* File member mode - octal. */ |
| char ar_namlen[4]; /* File member name length - decimal. */ |
| char ar_name[2]; /* Start of member name. */ |
| } b_ar_hdr; |
| |
| |
| /* Information we keep for an XCOFF symbol. */ |
| |
| struct xcoff_symbol |
| { |
| /* The name of the symbol. */ |
| const char *name; |
| /* The address of the symbol. */ |
| uintptr_t address; |
| /* The size of the symbol. */ |
| size_t size; |
| }; |
| |
| /* Information to pass to xcoff_syminfo. */ |
| |
| struct xcoff_syminfo_data |
| { |
| /* Symbols for the next module. */ |
| struct xcoff_syminfo_data *next; |
| /* The XCOFF symbols, sorted by address. */ |
| struct xcoff_symbol *symbols; |
| /* The number of symbols. */ |
| size_t count; |
| }; |
| |
| /* Information about an include file. */ |
| |
| struct xcoff_incl |
| { |
| /* File name. */ |
| const char *filename; |
| /* Offset to first line number from the include file. */ |
| uintptr_t begin; |
| /* Offset to last line number from the include file. */ |
| uintptr_t end; |
| }; |
| |
| /* A growable vector of include files information. */ |
| |
| struct xcoff_incl_vector |
| { |
| /* Memory. This is an array of struct xcoff_incl. */ |
| struct backtrace_vector vec; |
| /* Number of include files. */ |
| size_t count; |
| }; |
| |
| /* A growable vector of functions information. */ |
| |
| struct xcoff_func |
| { |
| /* PC. */ |
| uintptr_t pc; |
| /* The size of the function. */ |
| size_t size; |
| /* Function name. */ |
| const char *name; |
| /* File name. */ |
| const char *filename; |
| /* Pointer to first lnno entry. */ |
| uintptr_t lnnoptr; |
| /* Base address of containing section. */ |
| uintptr_t sect_base; |
| /* Starting source line number. */ |
| int lnno; |
| }; |
| |
| /* A growable vector of function information. This is used while |
| reading the function symbols. */ |
| |
| struct xcoff_func_vector |
| { |
| /* Memory. This is an array of struct xcoff_func. */ |
| struct backtrace_vector vec; |
| /* Number of valid mappings. */ |
| size_t count; |
| }; |
| |
| /* The information we need to map a PC to a file and line. */ |
| |
| struct xcoff_fileline_data |
| { |
| /* The data for the next file we know about. */ |
| struct xcoff_fileline_data *next; |
| /* Functions information. */ |
| struct xcoff_func_vector func_vec; |
| /* Include files information. */ |
| struct xcoff_incl_vector incl_vec; |
| /* Line numbers information. */ |
| const unsigned char *linenos; |
| size_t linenos_size; |
| uint64_t lnnoptr0; |
| /* Loader address. */ |
| uintptr_t base_address; |
| }; |
| |
| /* Information we gather for the DWARF sections we care about. */ |
| |
| struct dwsect_info |
| { |
| /* Section file offset. */ |
| off_t offset; |
| /* Section size. */ |
| size_t size; |
| /* Section contents, after read from file. */ |
| const unsigned char *data; |
| }; |
| |
| /* A dummy callback function used when we can't find any debug info. */ |
| |
| static int |
| xcoff_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED, |
| uintptr_t pc ATTRIBUTE_UNUSED, |
| backtrace_full_callback callback ATTRIBUTE_UNUSED, |
| backtrace_error_callback error_callback, void *data) |
| { |
| error_callback (data, "no debug info in XCOFF executable", -1); |
| return 0; |
| } |
| |
| /* A dummy callback function used when we can't find a symbol |
| table. */ |
| |
| static void |
| xcoff_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED, |
| uintptr_t addr ATTRIBUTE_UNUSED, |
| backtrace_syminfo_callback callback ATTRIBUTE_UNUSED, |
| backtrace_error_callback error_callback, void *data) |
| { |
| error_callback (data, "no symbol table in XCOFF executable", -1); |
| } |
| |
| /* Compare struct xcoff_symbol for qsort. */ |
| |
| static int |
| xcoff_symbol_compare (const void *v1, const void *v2) |
| { |
| const struct xcoff_symbol *e1 = (const struct xcoff_symbol *) v1; |
| const struct xcoff_symbol *e2 = (const struct xcoff_symbol *) v2; |
| |
| if (e1->address < e2->address) |
| return -1; |
| else if (e1->address > e2->address) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Compare an ADDR against an xcoff_symbol for bsearch. */ |
| |
| static int |
| xcoff_symbol_search (const void *vkey, const void *ventry) |
| { |
| const uintptr_t *key = (const uintptr_t *) vkey; |
| const struct xcoff_symbol *entry = (const struct xcoff_symbol *) ventry; |
| uintptr_t addr; |
| |
| addr = *key; |
| if (addr < entry->address) |
| return -1; |
| else if ((entry->size == 0 && addr > entry->address) |
| || (entry->size > 0 && addr >= entry->address + entry->size)) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Add XDATA to the list in STATE. */ |
| |
| static void |
| xcoff_add_syminfo_data (struct backtrace_state *state, |
| struct xcoff_syminfo_data *xdata) |
| { |
| if (!state->threaded) |
| { |
| struct xcoff_syminfo_data **pp; |
| |
| for (pp = (struct xcoff_syminfo_data **) (void *) &state->syminfo_data; |
| *pp != NULL; |
| pp = &(*pp)->next) |
| ; |
| *pp = xdata; |
| } |
| else |
| { |
| while (1) |
| { |
| struct xcoff_syminfo_data **pp; |
| |
| pp = (struct xcoff_syminfo_data **) (void *) &state->syminfo_data; |
| |
| while (1) |
| { |
| struct xcoff_syminfo_data *p; |
| |
| p = backtrace_atomic_load_pointer (pp); |
| |
| if (p == NULL) |
| break; |
| |
| pp = &p->next; |
| } |
| |
| if (__sync_bool_compare_and_swap (pp, NULL, xdata)) |
| break; |
| } |
| } |
| } |
| |
| /* Return the symbol name and value for an ADDR. */ |
| |
| static void |
| xcoff_syminfo (struct backtrace_state *state ATTRIBUTE_UNUSED, uintptr_t addr, |
| backtrace_syminfo_callback callback, |
| backtrace_error_callback error_callback ATTRIBUTE_UNUSED, |
| void *data) |
| { |
| struct xcoff_syminfo_data *edata; |
| struct xcoff_symbol *sym = NULL; |
| const char *name; |
| |
| if (!state->threaded) |
| { |
| for (edata = (struct xcoff_syminfo_data *) state->syminfo_data; |
| edata != NULL; |
| edata = edata->next) |
| { |
| sym = ((struct xcoff_symbol *) |
| bsearch (&addr, edata->symbols, edata->count, |
| sizeof (struct xcoff_symbol), xcoff_symbol_search)); |
| if (sym != NULL) |
| break; |
| } |
| } |
| else |
| { |
| struct xcoff_syminfo_data **pp; |
| |
| pp = (struct xcoff_syminfo_data **) (void *) &state->syminfo_data; |
| while (1) |
| { |
| edata = backtrace_atomic_load_pointer (pp); |
| if (edata == NULL) |
| break; |
| |
| sym = ((struct xcoff_symbol *) |
| bsearch (&addr, edata->symbols, edata->count, |
| sizeof (struct xcoff_symbol), xcoff_symbol_search)); |
| if (sym != NULL) |
| break; |
| |
| pp = &edata->next; |
| } |
| } |
| |
| if (sym == NULL) |
| callback (data, addr, NULL, 0, 0); |
| else |
| { |
| name = sym->name; |
| /* AIX prepends a '.' to function entry points, remove it. */ |
| if (name && *name == '.') |
| ++name; |
| callback (data, addr, name, sym->address, sym->size); |
| } |
| } |
| |
| /* Return the name of an XCOFF symbol. */ |
| |
| static const char * |
| xcoff_symname (const b_xcoff_syment *asym, |
| const unsigned char *strtab, size_t strtab_size) |
| { |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| if (asym->n_zeroes != 0) |
| { |
| /* Make a copy as we will release the symtab view. */ |
| char name[SYMNMLEN+1]; |
| strncpy (name, asym->n_name, SYMNMLEN); |
| name[SYMNMLEN] = '\0'; |
| return strdup (name); |
| } |
| #endif |
| if (asym->n_sclass & 0x80) |
| return NULL; /* .debug */ |
| if (asym->n_offset_ >= strtab_size) |
| return NULL; |
| return (const char *) strtab + asym->n_offset_; |
| } |
| |
| /* Initialize the symbol table info for xcoff_syminfo. */ |
| |
| static int |
| xcoff_initialize_syminfo (struct backtrace_state *state, |
| uintptr_t base_address, |
| const b_xcoff_syment *syms, size_t nsyms, |
| const unsigned char *strtab, size_t strtab_size, |
| backtrace_error_callback error_callback, void *data, |
| struct xcoff_syminfo_data *sdata) |
| { |
| size_t xcoff_symbol_count; |
| size_t xcoff_symbol_size; |
| struct xcoff_symbol *xcoff_symbols; |
| size_t i; |
| unsigned int j; |
| |
| /* We only care about function symbols. Count them. */ |
| xcoff_symbol_count = 0; |
| for (i = 0; i < nsyms; ++i) |
| { |
| const b_xcoff_syment *asym = &syms[i]; |
| if ((asym->n_sclass == C_EXT || asym->n_sclass == C_HIDEXT |
| || asym->n_sclass == C_WEAKEXT) |
| && ISFCN (asym->n_type) && asym->n_numaux > 0 && asym->n_scnum > 0) |
| ++xcoff_symbol_count; |
| |
| i += asym->n_numaux; |
| } |
| |
| xcoff_symbol_size = xcoff_symbol_count * sizeof (struct xcoff_symbol); |
| xcoff_symbols = ((struct xcoff_symbol *) |
| backtrace_alloc (state, xcoff_symbol_size, error_callback, |
| data)); |
| if (xcoff_symbols == NULL) |
| return 0; |
| |
| j = 0; |
| for (i = 0; i < nsyms; ++i) |
| { |
| const b_xcoff_syment *asym = &syms[i]; |
| if ((asym->n_sclass == C_EXT || asym->n_sclass == C_HIDEXT |
| || asym->n_sclass == C_WEAKEXT) |
| && ISFCN (asym->n_type) && asym->n_numaux > 0 && asym->n_scnum > 0) |
| { |
| const b_xcoff_auxent *aux = (const b_xcoff_auxent *) (asym + 1); |
| xcoff_symbols[j].name = xcoff_symname (asym, strtab, strtab_size); |
| xcoff_symbols[j].address = base_address + asym->n_value; |
| /* x_fsize will be 0 if there is no debug information. */ |
| xcoff_symbols[j].size = aux->x_fcn.x_fsize; |
| ++j; |
| } |
| |
| i += asym->n_numaux; |
| } |
| |
| backtrace_qsort (xcoff_symbols, xcoff_symbol_count, |
| sizeof (struct xcoff_symbol), xcoff_symbol_compare); |
| |
| sdata->next = NULL; |
| sdata->symbols = xcoff_symbols; |
| sdata->count = xcoff_symbol_count; |
| |
| return 1; |
| } |
| |
| /* Compare struct xcoff_func for qsort. */ |
| |
| static int |
| xcoff_func_compare (const void *v1, const void *v2) |
| { |
| const struct xcoff_func *fn1 = (const struct xcoff_func *) v1; |
| const struct xcoff_func *fn2 = (const struct xcoff_func *) v2; |
| |
| if (fn1->pc < fn2->pc) |
| return -1; |
| else if (fn1->pc > fn2->pc) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Compare a PC against an xcoff_func for bsearch. */ |
| |
| static int |
| xcoff_func_search (const void *vkey, const void *ventry) |
| { |
| const uintptr_t *key = (const uintptr_t *) vkey; |
| const struct xcoff_func *entry = (const struct xcoff_func *) ventry; |
| uintptr_t pc; |
| |
| pc = *key; |
| if (pc < entry->pc) |
| return -1; |
| else if ((entry->size == 0 && pc > entry->pc) |
| || (entry->size > 0 && pc >= entry->pc + entry->size)) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Compare struct xcoff_incl for qsort. */ |
| |
| static int |
| xcoff_incl_compare (const void *v1, const void *v2) |
| { |
| const struct xcoff_incl *in1 = (const struct xcoff_incl *) v1; |
| const struct xcoff_incl *in2 = (const struct xcoff_incl *) v2; |
| |
| if (in1->begin < in2->begin) |
| return -1; |
| else if (in1->begin > in2->begin) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Find a lnnoptr in an include file. */ |
| |
| static int |
| xcoff_incl_search (const void *vkey, const void *ventry) |
| { |
| const uintptr_t *key = (const uintptr_t *) vkey; |
| const struct xcoff_incl *entry = (const struct xcoff_incl *) ventry; |
| uintptr_t lnno; |
| |
| lnno = *key; |
| if (lnno < entry->begin) |
| return -1; |
| else if (lnno > entry->end) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Look for a PC in the function vector for one module. On success, |
| call CALLBACK and return whatever it returns. On error, call |
| ERROR_CALLBACK and return 0. Sets *FOUND to 1 if the PC is found, |
| 0 if not. */ |
| |
| static int |
| xcoff_lookup_pc (struct backtrace_state *state ATTRIBUTE_UNUSED, |
| struct xcoff_fileline_data *fdata, uintptr_t pc, |
| backtrace_full_callback callback, |
| backtrace_error_callback error_callback ATTRIBUTE_UNUSED, |
| void *data, int *found) |
| { |
| const struct xcoff_incl *incl, *bincl; |
| const struct xcoff_func *fn; |
| const b_xcoff_lineno *lineno; |
| const unsigned char *lineptr; |
| const char *function; |
| const char *filename; |
| uintptr_t lnnoptr, match; |
| uint32_t lnno = 0; |
| |
| *found = 1; |
| |
| if ((pc & 3) != 0) |
| ++pc; |
| |
| /* Find the function first. */ |
| fn = ((struct xcoff_func *) |
| bsearch (&pc, fdata->func_vec.vec.base, fdata->func_vec.count, |
| sizeof (struct xcoff_func), xcoff_func_search)); |
| if (fn == NULL) |
| { |
| *found = 0; |
| return 0; |
| } |
| |
| filename = fn->filename; |
| |
| /* Find the line number next. */ |
| |
| /* Skip first entry that points to symtab. */ |
| lnnoptr = fn->lnnoptr + LINESZ; |
| match = lnnoptr; |
| |
| lineptr = fdata->linenos + (lnnoptr - fdata->lnnoptr0); |
| while (lineptr + LINESZ <= fdata->linenos + fdata->linenos_size) |
| { |
| lineno = (const b_xcoff_lineno *) lineptr; |
| if (lineno->l_lnno == 0) |
| break; |
| if (pc <= fdata->base_address + lineno->l_addr.l_paddr) |
| break; |
| match = lnnoptr; |
| lnno = lineno->l_lnno; |
| |
| lnnoptr += LINESZ; |
| lineptr += LINESZ; |
| } |
| |
| /* If part of a function other than the beginning comes from an |
| include file, the line numbers are absolute, rather than |
| relative to the beginning of the function. */ |
| incl = ((struct xcoff_incl *) |
| bsearch (&match, fdata->incl_vec.vec.base, |
| fdata->incl_vec.count, sizeof (struct xcoff_incl), |
| xcoff_incl_search)); |
| if (incl != NULL) |
| { |
| bincl = ((struct xcoff_incl *) |
| bsearch (&fn->lnnoptr, fdata->incl_vec.vec.base, |
| fdata->incl_vec.count, sizeof (struct xcoff_incl), |
| xcoff_incl_search)); |
| if (bincl != NULL && strcmp (incl->filename, bincl->filename) == 0) |
| { |
| lnno += fn->lnno - 1; |
| } |
| filename = incl->filename; |
| } |
| else |
| { |
| lnno += fn->lnno - 1; |
| } |
| |
| function = fn->name; |
| /* AIX prepends a '.' to function entry points, remove it. */ |
| if (function != NULL && *function == '.') |
| ++function; |
| return callback (data, pc, filename, lnno, function); |
| } |
| |
| /* Return the file/line information for a PC using the XCOFF lineno |
| mapping we built earlier. */ |
| |
| static int |
| xcoff_fileline (struct backtrace_state *state, uintptr_t pc, |
| backtrace_full_callback callback, |
| backtrace_error_callback error_callback, void *data) |
| |
| { |
| struct xcoff_fileline_data *fdata; |
| int found; |
| int ret; |
| |
| if (!state->threaded) |
| { |
| for (fdata = (struct xcoff_fileline_data *) state->fileline_data; |
| fdata != NULL; |
| fdata = fdata->next) |
| { |
| ret = xcoff_lookup_pc (state, fdata, pc, callback, error_callback, |
| data, &found); |
| if (ret != 0 || found) |
| return ret; |
| } |
| } |
| else |
| { |
| struct xcoff_fileline_data **pp; |
| |
| pp = (struct xcoff_fileline_data **) (void *) &state->fileline_data; |
| while (1) |
| { |
| fdata = backtrace_atomic_load_pointer (pp); |
| if (fdata == NULL) |
| break; |
| |
| ret = xcoff_lookup_pc (state, fdata, pc, callback, error_callback, |
| data, &found); |
| if (ret != 0 || found) |
| return ret; |
| |
| pp = &fdata->next; |
| } |
| } |
| |
| /* FIXME: See if any libraries have been dlopen'ed. */ |
| |
| return callback (data, pc, NULL, 0, NULL); |
| } |
| |
| /* Initialize the function vector info for xcoff_fileline. */ |
| |
| static int |
| xcoff_initialize_fileline (struct backtrace_state *state, |
| uintptr_t base_address, |
| const b_xcoff_scnhdr *sects, |
| const b_xcoff_syment *syms, size_t nsyms, |
| const unsigned char *strtab, size_t strtab_size, |
| const unsigned char *linenos, size_t linenos_size, |
| uint64_t lnnoptr0, |
| backtrace_error_callback error_callback, void *data) |
| { |
| struct xcoff_fileline_data *fdata; |
| struct xcoff_func *fn; |
| const b_xcoff_syment *fsym; |
| const b_xcoff_auxent *aux; |
| const char *filename; |
| const char *name; |
| struct xcoff_incl *incl; |
| uintptr_t begin, end; |
| uintptr_t lnno, lnnoptr; |
| uint32_t fsize; |
| size_t i; |
| |
| fdata = ((struct xcoff_fileline_data *) |
| backtrace_alloc (state, sizeof (struct xcoff_fileline_data), |
| error_callback, data)); |
| if (fdata == NULL) |
| return 0; |
| memset (fdata, 0, sizeof *fdata); |
| fdata->base_address = base_address; |
| fdata->linenos = linenos; |
| fdata->linenos_size = linenos_size; |
| fdata->lnnoptr0 = lnnoptr0; |
| |
| begin = 0; |
| filename = NULL; |
| fsym = NULL; |
| lnnoptr = 0; |
| fsize = 0; |
| for (i = 0; i < nsyms; ++i) |
| { |
| const b_xcoff_syment *asym = &syms[i]; |
| |
| switch (asym->n_sclass) |
| { |
| case C_BINCL: |
| begin = asym->n_value; |
| break; |
| |
| case C_EINCL: |
| if (begin == 0) |
| break; |
| end = asym->n_value; |
| incl = ((struct xcoff_incl *) |
| backtrace_vector_grow (state, sizeof (struct xcoff_incl), |
| error_callback, data, |
| &fdata->incl_vec.vec)); |
| if (incl != NULL) |
| { |
| incl->filename = xcoff_symname (asym, strtab, strtab_size); |
| incl->begin = begin; |
| incl->end = end; |
| ++fdata->incl_vec.count; |
| } |
| begin = 0; |
| break; |
| |
| case C_FILE: |
| filename = xcoff_symname (asym, strtab, strtab_size); |
| if (filename == NULL) |
| break; |
| |
| /* If the file auxiliary entry is not used, the symbol name is |
| the name of the source file. If the file auxiliary entry is |
| used, then the symbol name should be .file, and the first |
| file auxiliary entry (by convention) contains the source |
| file name. */ |
| |
| if (asym->n_numaux > 0 && strcmp (filename, ".file") == 0) |
| { |
| aux = (const b_xcoff_auxent *) (asym + 1); |
| if (aux->x_file._x.x_zeroes != 0) |
| { |
| /* Make a copy as we will release the symtab view. */ |
| char name[FILNMLEN+1]; |
| strncpy (name, aux->x_file.x_fname, FILNMLEN); |
| name[FILNMLEN] = '\0'; |
| filename = strdup (name); |
| } |
| else if (aux->x_file._x.x_offset < strtab_size) |
| filename = (const char *) strtab + aux->x_file._x.x_offset; |
| else |
| filename = NULL; |
| } |
| break; |
| |
| case C_EXT: |
| case C_HIDEXT: |
| case C_WEAKEXT: |
| fsym = NULL; |
| lnnoptr = 0; |
| fsize = 0; |
| if (!ISFCN (asym->n_type) || asym->n_numaux == 0 |
| || asym->n_scnum <= 0) |
| break; |
| if (filename == NULL) |
| break; |
| aux = (const b_xcoff_auxent *) (asym + 1); |
| lnnoptr = aux->x_fcn.x_lnnoptr; |
| if (lnnoptr < lnnoptr0 |
| || lnnoptr + LINESZ > lnnoptr0 + linenos_size) |
| break; |
| /* x_fsize will be 0 if there is no debug information. */ |
| fsize = aux->x_fcn.x_fsize; |
| fsym = asym; |
| break; |
| |
| case C_FCN: |
| if (asym->n_numaux == 0) |
| break; |
| if (fsym == NULL) |
| break; |
| name = xcoff_symname (asym, strtab, strtab_size); |
| if (name == NULL || strcmp (name, ".bf") != 0) |
| { |
| fsym = NULL; |
| break; |
| } |
| aux = (const b_xcoff_auxent *) (asym + 1); |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| lnno = (uint32_t) aux->x_block.x_lnnohi << 16 |
| | aux->x_block.x_lnno; |
| #else |
| lnno = aux->x_block.x_lnno; |
| #endif |
| fn = ((struct xcoff_func *) |
| backtrace_vector_grow (state, sizeof (struct xcoff_func), |
| error_callback, data, |
| &fdata->func_vec.vec)); |
| if (fn == NULL) |
| break; |
| fn->name = xcoff_symname (fsym, strtab, strtab_size); |
| fn->filename = filename; |
| fn->sect_base = sects[fsym->n_scnum - 1].s_paddr; |
| fn->pc = base_address + fsym->n_value; |
| fn->size = fsize; |
| fn->lnno = lnno; |
| fn->lnnoptr = lnnoptr; |
| ++fdata->func_vec.count; |
| break; |
| } |
| |
| i += asym->n_numaux; |
| } |
| |
| if (!backtrace_vector_release (state, &fdata->func_vec.vec, error_callback, |
| data)) |
| goto fail; |
| backtrace_qsort (fdata->func_vec.vec.base, fdata->func_vec.count, |
| sizeof (struct xcoff_func), xcoff_func_compare); |
| |
| if (!backtrace_vector_release (state, &fdata->incl_vec.vec, error_callback, |
| data)) |
| goto fail; |
| backtrace_qsort (fdata->incl_vec.vec.base, fdata->incl_vec.count, |
| sizeof (struct xcoff_incl), xcoff_incl_compare); |
| |
| if (!state->threaded) |
| { |
| struct xcoff_fileline_data **pp; |
| |
| for (pp = (struct xcoff_fileline_data **) (void *) &state->fileline_data; |
| *pp != NULL; |
| pp = &(*pp)->next) |
| ; |
| *pp = fdata; |
| } |
| else |
| { |
| while (1) |
| { |
| struct xcoff_fileline_data **pp; |
| |
| pp = (struct xcoff_fileline_data **) (void *) &state->fileline_data; |
| |
| while (1) |
| { |
| struct xcoff_fileline_data *p; |
| |
| p = backtrace_atomic_load_pointer (pp); |
| |
| if (p == NULL) |
| break; |
| |
| pp = &p->next; |
| } |
| |
| if (__sync_bool_compare_and_swap (pp, NULL, fdata)) |
| break; |
| } |
| } |
| |
| return 1; |
| |
| fail: |
| return 0; |
| } |
| |
| /* Add the backtrace data for one XCOFF file. Returns 1 on success, |
| 0 on failure (in both cases descriptor is closed). */ |
| |
| static int |
| xcoff_add (struct backtrace_state *state, int descriptor, off_t offset, |
| uintptr_t base_address, backtrace_error_callback error_callback, |
| void *data, fileline *fileline_fn, int *found_sym, int exe) |
| { |
| struct backtrace_view fhdr_view; |
| struct backtrace_view sects_view; |
| struct backtrace_view linenos_view; |
| struct backtrace_view syms_view; |
| struct backtrace_view str_view; |
| struct backtrace_view dwarf_view; |
| b_xcoff_filhdr fhdr; |
| const b_xcoff_scnhdr *sects; |
| const b_xcoff_scnhdr *stext; |
| uint64_t lnnoptr; |
| uint32_t nlnno; |
| off_t str_off; |
| off_t min_offset; |
| off_t max_offset; |
| struct dwsect_info dwsect[DEBUG_MAX]; |
| size_t sects_size; |
| size_t syms_size; |
| int32_t str_size; |
| int sects_view_valid; |
| int linenos_view_valid; |
| int syms_view_valid; |
| int str_view_valid; |
| int dwarf_view_valid; |
| int magic_ok; |
| int i; |
| struct dwarf_sections dwarf_sections; |
| |
| *found_sym = 0; |
| |
| sects_view_valid = 0; |
| linenos_view_valid = 0; |
| syms_view_valid = 0; |
| str_view_valid = 0; |
| dwarf_view_valid = 0; |
| |
| str_size = 0; |
| |
| /* Map the XCOFF file header. */ |
| if (!backtrace_get_view (state, descriptor, offset, sizeof (b_xcoff_filhdr), |
| error_callback, data, &fhdr_view)) |
| goto fail; |
| |
| memcpy (&fhdr, fhdr_view.data, sizeof fhdr); |
| magic_ok = (fhdr.f_magic == XCOFF_MAGIC); |
| |
| backtrace_release_view (state, &fhdr_view, error_callback, data); |
| |
| if (!magic_ok) |
| { |
| if (exe) |
| error_callback (data, "executable file is not XCOFF", 0); |
| goto fail; |
| } |
| |
| /* Verify object is of expected type. */ |
| if ((exe && (fhdr.f_flags & F_SHROBJ)) |
| || (!exe && !(fhdr.f_flags & F_SHROBJ))) |
| goto fail; |
| |
| /* Read the section headers. */ |
| |
| sects_size = fhdr.f_nscns * sizeof (b_xcoff_scnhdr); |
| |
| if (!backtrace_get_view (state, descriptor, |
| offset + sizeof (fhdr) + fhdr.f_opthdr, |
| sects_size, error_callback, data, §s_view)) |
| goto fail; |
| sects_view_valid = 1; |
| sects = (const b_xcoff_scnhdr *) sects_view.data; |
| |
| /* FIXME: assumes only one .text section. */ |
| for (i = 0; i < fhdr.f_nscns; ++i) |
| if ((sects[i].s_flags & 0xffff) == STYP_TEXT) |
| break; |
| if (i == fhdr.f_nscns) |
| goto fail; |
| |
| stext = §s[i]; |
| |
| /* base_address represents the difference between the |
| virtual memory address of the shared object or a loaded |
| executable and the offset of that object in the file |
| from which it was loaded. |
| On AIX, virtual address is either fixed for executable |
| or given by ldinfo. This address will include the XCOFF |
| headers. */ |
| base_address = ((exe ? XCOFF_AIX_TEXTBASE : base_address) |
| + stext->s_scnptr |
| - stext->s_paddr); |
| |
| lnnoptr = stext->s_lnnoptr; |
| nlnno = stext->s_nlnno; |
| |
| #if BACKTRACE_XCOFF_SIZE == 32 |
| if (nlnno == _OVERFLOW_MARKER) |
| { |
| int sntext = i + 1; |
| /* Find the matching .ovrflo section. */ |
| for (i = 0; i < fhdr.f_nscns; ++i) |
| { |
| if (((sects[i].s_flags & 0xffff) == STYP_OVRFLO) |
| && sects[i].s_nlnno == sntext) |
| { |
| nlnno = sects[i].s_vaddr; |
| break; |
| } |
| } |
| } |
| #endif |
| |
| /* Read the symbol table and the string table. */ |
| |
| if (fhdr.f_symptr != 0) |
| { |
| struct xcoff_syminfo_data *sdata; |
| |
| /* Symbol table is followed by the string table. The string table |
| starts with its length (on 4 bytes). |
| Map the symbol table and the length of the string table. */ |
| syms_size = fhdr.f_nsyms * sizeof (b_xcoff_syment); |
| |
| if (!backtrace_get_view (state, descriptor, offset + fhdr.f_symptr, |
| syms_size + 4, error_callback, data, |
| &syms_view)) |
| goto fail; |
| syms_view_valid = 1; |
| |
| memcpy (&str_size, syms_view.data + syms_size, 4); |
| |
| str_off = fhdr.f_symptr + syms_size; |
| |
| if (str_size > 4) |
| { |
| /* Map string table (including the length word). */ |
| |
| if (!backtrace_get_view (state, descriptor, offset + str_off, |
| str_size, error_callback, data, &str_view)) |
| goto fail; |
| str_view_valid = 1; |
| } |
| |
| sdata = ((struct xcoff_syminfo_data *) |
| backtrace_alloc (state, sizeof *sdata, error_callback, data)); |
| if (sdata == NULL) |
| goto fail; |
| |
| if (!xcoff_initialize_syminfo (state, base_address, |
| syms_view.data, fhdr.f_nsyms, |
| str_view.data, str_size, |
| error_callback, data, sdata)) |
| { |
| backtrace_free (state, sdata, sizeof *sdata, error_callback, data); |
| goto fail; |
| } |
| |
| *found_sym = 1; |
| |
| xcoff_add_syminfo_data (state, sdata); |
| } |
| |
| /* Read all the DWARF sections in a single view, since they are |
| probably adjacent in the file. We never release this view. */ |
| |
| min_offset = 0; |
| max_offset = 0; |
| memset (dwsect, 0, sizeof dwsect); |
| for (i = 0; i < fhdr.f_nscns; ++i) |
| { |
| off_t end; |
| int idx; |
| |
| if ((sects[i].s_flags & 0xffff) != STYP_DWARF |
| || sects[i].s_size == 0) |
| continue; |
| /* Map DWARF section to array index. */ |
| switch (sects[i].s_flags & 0xffff0000) |
| { |
| case SSUBTYP_DWINFO: |
| idx = DEBUG_INFO; |
| break; |
| case SSUBTYP_DWLINE: |
| idx = DEBUG_LINE; |
| break; |
| case SSUBTYP_DWABREV: |
| idx = DEBUG_ABBREV; |
| break; |
| case SSUBTYP_DWRNGES: |
| idx = DEBUG_RANGES; |
| break; |
| case SSUBTYP_DWSTR: |
| idx = DEBUG_STR; |
| break; |
| default: |
| continue; |
| } |
| if (min_offset == 0 || (off_t) sects[i].s_scnptr < min_offset) |
| min_offset = sects[i].s_scnptr; |
| end = sects[i].s_scnptr + sects[i].s_size; |
| if (end > max_offset) |
| max_offset = end; |
| dwsect[idx].offset = sects[i].s_scnptr; |
| dwsect[idx].size = sects[i].s_size; |
| } |
| if (min_offset != 0 && max_offset != 0) |
| { |
| if (!backtrace_get_view (state, descriptor, offset + min_offset, |
| max_offset - min_offset, |
| error_callback, data, &dwarf_view)) |
| goto fail; |
| dwarf_view_valid = 1; |
| |
| for (i = 0; i < (int) DEBUG_MAX; ++i) |
| { |
| if (dwsect[i].offset == 0) |
| dwsect[i].data = NULL; |
| else |
| dwsect[i].data = ((const unsigned char *) dwarf_view.data |
| + (dwsect[i].offset - min_offset)); |
| } |
| |
| memset (&dwarf_sections, 0, sizeof dwarf_sections); |
| |
| dwarf_sections.data[DEBUG_INFO] = dwsect[DEBUG_INFO].data; |
| dwarf_sections.size[DEBUG_INFO] = dwsect[DEBUG_INFO].size; |
| dwarf_sections.data[DEBUG_LINE] = dwsect[DEBUG_LINE].data; |
| dwarf_sections.size[DEBUG_LINE] = dwsect[DEBUG_LINE].size; |
| dwarf_sections.data[DEBUG_ABBREV] = dwsect[DEBUG_ABBREV].data; |
| dwarf_sections.size[DEBUG_ABBREV] = dwsect[DEBUG_ABBREV].size; |
| dwarf_sections.data[DEBUG_RANGES] = dwsect[DEBUG_RANGES].data; |
| dwarf_sections.size[DEBUG_RANGES] = dwsect[DEBUG_RANGES].size; |
| dwarf_sections.data[DEBUG_STR] = dwsect[DEBUG_STR].data; |
| dwarf_sections.size[DEBUG_STR] = dwsect[DEBUG_STR].size; |
| |
| if (!backtrace_dwarf_add (state, base_address, &dwarf_sections, |
| 1, /* big endian */ |
| NULL, /* altlink */ |
| error_callback, data, fileline_fn, |
| NULL /* returned fileline_entry */)) |
| goto fail; |
| } |
| |
| /* Read the XCOFF line number entries if DWARF sections not found. */ |
| |
| if (!dwarf_view_valid && fhdr.f_symptr != 0 && lnnoptr != 0) |
| { |
| size_t linenos_size = (size_t) nlnno * LINESZ; |
| |
| /* We never release this view. */ |
| if (!backtrace_get_view (state, descriptor, offset + lnnoptr, |
| linenos_size, |
| error_callback, data, &linenos_view)) |
| goto fail; |
| linenos_view_valid = 1; |
| |
| if (xcoff_initialize_fileline (state, base_address, sects, |
| syms_view.data, fhdr.f_nsyms, |
| str_view.data, str_size, |
| linenos_view.data, linenos_size, |
| lnnoptr, error_callback, data)) |
| *fileline_fn = xcoff_fileline; |
| } |
| |
| backtrace_release_view (state, §s_view, error_callback, data); |
| sects_view_valid = 0; |
| if (syms_view_valid) |
| backtrace_release_view (state, &syms_view, error_callback, data); |
| syms_view_valid = 0; |
| |
| /* We've read all we need from the executable. */ |
| if (!backtrace_close (descriptor, error_callback, data)) |
| goto fail; |
| descriptor = -1; |
| |
| return 1; |
| |
| fail: |
| if (sects_view_valid) |
| backtrace_release_view (state, §s_view, error_callback, data); |
| if (str_view_valid) |
| backtrace_release_view (state, &str_view, error_callback, data); |
| if (syms_view_valid) |
| backtrace_release_view (state, &syms_view, error_callback, data); |
| if (linenos_view_valid) |
| backtrace_release_view (state, &linenos_view, error_callback, data); |
| if (dwarf_view_valid) |
| backtrace_release_view (state, &dwarf_view, error_callback, data); |
| if (descriptor != -1 && offset == 0) |
| backtrace_close (descriptor, error_callback, data); |
| return 0; |
| } |
| |
| #ifdef HAVE_LOADQUERY |
| |
| /* Read an integer value in human-readable format from an AIX |
| big archive fixed-length or member header. */ |
| |
| static int |
| xcoff_parse_decimal (const char *buf, size_t size, off_t *off) |
| { |
| char str[32]; |
| char *end; |
| |
| if (size >= sizeof str) |
| return 0; |
| memcpy (str, buf, size); |
| str[size] = '\0'; |
| *off = strtol (str, &end, 10); |
| if (*end != '\0' && *end != ' ') |
| return 0; |
| |
| return 1; |
| } |
| |
| /* Add the backtrace data for a member of an AIX big archive. |
| Returns 1 on success, 0 on failure. */ |
| |
| static int |
| xcoff_armem_add (struct backtrace_state *state, int descriptor, |
| uintptr_t base_address, const char *member, |
| backtrace_error_callback error_callback, void *data, |
| fileline *fileline_fn, int *found_sym) |
| { |
| struct backtrace_view view; |
| b_ar_fl_hdr fl_hdr; |
| const b_ar_hdr *ar_hdr; |
| off_t off; |
| off_t len; |
| int memlen; |
| |
| *found_sym = 0; |
| |
| /* Map archive fixed-length header. */ |
| |
| if (!backtrace_get_view (state, descriptor, 0, sizeof (b_ar_fl_hdr), |
| error_callback, data, &view)) |
| goto fail; |
| |
| memcpy (&fl_hdr, view.data, sizeof (b_ar_fl_hdr)); |
| |
| backtrace_release_view (state, &view, error_callback, data); |
| |
| if (memcmp (fl_hdr.fl_magic, AIAMAGBIG, 8) != 0) |
| goto fail; |
| |
| memlen = strlen (member); |
| |
| /* Read offset of first archive member. */ |
| if (!xcoff_parse_decimal (fl_hdr.fl_fstmoff, sizeof fl_hdr.fl_fstmoff, &off)) |
| goto fail; |
| while (off != 0) |
| { |
| /* Map archive member header and member name. */ |
| |
| if (!backtrace_get_view (state, descriptor, off, |
| sizeof (b_ar_hdr) + memlen, |
| error_callback, data, &view)) |
| break; |
| |
| ar_hdr = (const b_ar_hdr *) view.data; |
| |
| /* Read archive member name length. */ |
| if (!xcoff_parse_decimal (ar_hdr->ar_namlen, sizeof ar_hdr->ar_namlen, |
| &len)) |
| { |
| backtrace_release_view (state, &view, error_callback, data); |
| break; |
| } |
| if (len == memlen && !memcmp (ar_hdr->ar_name, member, memlen)) |
| { |
| off = (off + sizeof (b_ar_hdr) + memlen + 1) & ~1; |
| |
| /* The archive can contain several members with the same name |
| (e.g. 32-bit and 64-bit), so continue if not ok. */ |
| |
| if (xcoff_add (state, descriptor, off, base_address, error_callback, |
| data, fileline_fn, found_sym, 0)) |
| { |
| backtrace_release_view (state, &view, error_callback, data); |
| return 1; |
| } |
| } |
| |
| /* Read offset of next archive member. */ |
| if (!xcoff_parse_decimal (ar_hdr->ar_nxtmem, sizeof ar_hdr->ar_nxtmem, |
| &off)) |
| { |
| backtrace_release_view (state, &view, error_callback, data); |
| break; |
| } |
| backtrace_release_view (state, &view, error_callback, data); |
| } |
| |
| fail: |
| /* No matching member found. */ |
| backtrace_close (descriptor, error_callback, data); |
| return 0; |
| } |
| |
| /* Add the backtrace data for dynamically loaded libraries. */ |
| |
| static void |
| xcoff_add_shared_libs (struct backtrace_state *state, |
| backtrace_error_callback error_callback, |
| void *data, fileline *fileline_fn, int *found_sym) |
| { |
| const struct ld_info *ldinfo; |
| void *buf; |
| unsigned int buflen; |
| const char *member; |
| int descriptor; |
| int does_not_exist; |
| int lib_found_sym; |
| int ret; |
| |
| /* Retrieve the list of loaded libraries. */ |
| |
| buf = NULL; |
| buflen = 512; |
| do |
| { |
| buf = realloc (buf, buflen); |
| if (buf == NULL) |
| { |
| ret = -1; |
| break; |
| } |
| ret = loadquery (L_GETINFO, buf, buflen); |
| if (ret == 0) |
| break; |
| buflen *= 2; |
| } |
| while (ret == -1 && errno == ENOMEM); |
| if (ret != 0) |
| { |
| free (buf); |
| return; |
| } |
| |
| ldinfo = (const struct ld_info *) buf; |
| while ((const char *) ldinfo < (const char *) buf + buflen) |
| { |
| if (*ldinfo->ldinfo_filename != '/') |
| goto next; |
| |
| descriptor = backtrace_open (ldinfo->ldinfo_filename, error_callback, |
| data, &does_not_exist); |
| if (descriptor < 0) |
| goto next; |
| |
| /* Check if it is an archive (member name not empty). */ |
| |
| member = ldinfo->ldinfo_filename + strlen (ldinfo->ldinfo_filename) + 1; |
| if (*member) |
| { |
| xcoff_armem_add (state, descriptor, |
| (uintptr_t) ldinfo->ldinfo_textorg, member, |
| error_callback, data, fileline_fn, &lib_found_sym); |
| } |
| else |
| { |
| xcoff_add (state, descriptor, 0, (uintptr_t) ldinfo->ldinfo_textorg, |
| error_callback, data, fileline_fn, &lib_found_sym, 0); |
| } |
| if (lib_found_sym) |
| *found_sym = 1; |
| |
| next: |
| if (ldinfo->ldinfo_next == 0) |
| break; |
| ldinfo = (const struct ld_info *) ((const char *) ldinfo |
| + ldinfo->ldinfo_next); |
| } |
| |
| free (buf); |
| } |
| #endif /* HAVE_LOADQUERY */ |
| |
| /* Initialize the backtrace data we need from an XCOFF executable. |
| Returns 1 on success, 0 on failure. */ |
| |
| int |
| backtrace_initialize (struct backtrace_state *state, |
| const char *filename ATTRIBUTE_UNUSED, int descriptor, |
| backtrace_error_callback error_callback, |
| void *data, fileline *fileline_fn) |
| { |
| int ret; |
| int found_sym; |
| fileline xcoff_fileline_fn = xcoff_nodebug; |
| |
| ret = xcoff_add (state, descriptor, 0, 0, error_callback, data, |
| &xcoff_fileline_fn, &found_sym, 1); |
| if (!ret) |
| return 0; |
| |
| #ifdef HAVE_LOADQUERY |
| xcoff_add_shared_libs (state, error_callback, data, &xcoff_fileline_fn, |
| &found_sym); |
| #endif |
| |
| if (!state->threaded) |
| { |
| if (found_sym) |
| state->syminfo_fn = xcoff_syminfo; |
| else if (state->syminfo_fn == NULL) |
| state->syminfo_fn = xcoff_nosyms; |
| } |
| else |
| { |
| if (found_sym) |
| backtrace_atomic_store_pointer (&state->syminfo_fn, xcoff_syminfo); |
| else |
| (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, |
| xcoff_nosyms); |
| } |
| |
| if (!state->threaded) |
| { |
| if (state->fileline_fn == NULL || state->fileline_fn == xcoff_nodebug) |
| *fileline_fn = xcoff_fileline_fn; |
| } |
| else |
| { |
| fileline current_fn; |
| |
| current_fn = backtrace_atomic_load_pointer (&state->fileline_fn); |
| if (current_fn == NULL || current_fn == xcoff_nodebug) |
| *fileline_fn = xcoff_fileline_fn; |
| } |
| |
| return 1; |
| } |