From 14ed0a8b1b61f7626134f5490b89dffa564a26bc Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sun, 1 Feb 2004 22:35:24 +0000 Subject: [PATCH] 2004-01-28 Roland McGrath * auxv.h: New file. * auxv.c: New file. * Makefile.in (auxv_h): New variable. (COMMON_OBS): Add auxv.o here. (auxv.o): New target. --- gdb/auxv.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ gdb/auxv.h | 75 +++++++++++++++ 2 files changed, 376 insertions(+) create mode 100644 gdb/auxv.c create mode 100644 gdb/auxv.h diff --git a/gdb/auxv.c b/gdb/auxv.c new file mode 100644 index 0000000..c28014c --- /dev/null +++ b/gdb/auxv.c @@ -0,0 +1,301 @@ +/* Auxiliary vector support for GDB, the GNU debugger. + + Copyright 2004 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. */ + +#include "defs.h" +#include "target.h" +#include "gdbtypes.h" +#include "command.h" +#include "inferior.h" +#include "valprint.h" +#include "gdb_assert.h" + +#include "auxv.h" +#include "elf/common.h" + +#include +#include + + +/* This function is called like a to_xfer_partial hook, + but must be called with TARGET_OBJECT_AUXV. + It handles access via /proc/PID/auxv, which is the common method. + This function is appropriate for doing: + #define NATIVE_XFER_AUXV procfs_xfer_auxv + for a native target that uses inftarg.c's child_xfer_partial hook. */ + +LONGEST +procfs_xfer_auxv (struct target_ops *ops, + int /* enum target_object */ object, + const char *annex, + void *readbuf, + const void *writebuf, + ULONGEST offset, + LONGEST len) +{ + char *pathname; + int fd; + LONGEST n; + + gdb_assert (object == TARGET_OBJECT_AUXV); + gdb_assert (readbuf || writebuf); + + pathname = xstrprintf ("/proc/%d/auxv", PIDGET (inferior_ptid)); + fd = open (pathname, writebuf != NULL ? O_WRONLY : O_RDONLY); + xfree (pathname); + if (fd < 0) + return -1; + + if (offset != (ULONGEST) 0 + && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) + n = -1; + else if (readbuf != NULL) + n = read (fd, readbuf, len); + else + n = write (fd, writebuf, len); + + (void) close (fd); + + return n; +} + +/* Read all the auxv data into a contiguous xmalloc'd buffer, + stored in *DATA. Return the size in bytes of this data. + If zero, there is no data and *DATA is null. + if < 0, there was an error and *DATA is null. */ +LONGEST +target_auxv_read (struct target_ops *ops, char **data) +{ + size_t auxv_alloc = 512, auxv_pos = 0; + char *auxv = xmalloc (auxv_alloc); + int n; + + while (1) + { + n = target_read_partial (ops, TARGET_OBJECT_AUXV, + NULL, &auxv[auxv_pos], 0, + auxv_alloc - auxv_pos); + if (n <= 0) + break; + auxv_pos += n; + if (auxv_pos < auxv_alloc) /* Read all there was. */ + break; + gdb_assert (auxv_pos == auxv_alloc); + auxv_alloc *= 2; + auxv = xrealloc (auxv, auxv_alloc); + } + + if (auxv_pos == 0) + { + xfree (auxv); + *data = NULL; + return n; + } + + *data = auxv; + return auxv_pos; +} + +/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. + Return 0 if *READPTR is already at the end of the buffer. + Return -1 if there is insufficient buffer for a whole entry. + Return 1 if an entry was read into *TYPEP and *VALP. */ +int +target_auxv_parse (struct target_ops *ops, char **readptr, char *endptr, + CORE_ADDR *typep, CORE_ADDR *valp) +{ + const int sizeof_auxv_field = TYPE_LENGTH (builtin_type_void_data_ptr); + char *ptr = *readptr; + + if (endptr == ptr) + return 0; + + if (endptr - ptr < sizeof_auxv_field * 2) + return -1; + + *typep = extract_unsigned_integer (ptr, sizeof_auxv_field); + ptr += sizeof_auxv_field; + *valp = extract_unsigned_integer (ptr, sizeof_auxv_field); + ptr += sizeof_auxv_field; + + *readptr = ptr; + return 1; +} + +/* Extract the auxiliary vector entry with a_type matching MATCH. + Return zero if no such entry was found, or -1 if there was + an error getting the information. On success, return 1 after + storing the entry's value field in *VALP. */ +int +target_auxv_search (struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp) +{ + CORE_ADDR type, val; + char *data; + int n = target_auxv_read (ops, &data); + char *ptr = data; + int ents = 0; + + if (n <= 0) + return n; + + while (1) + switch (target_auxv_parse (ops, &ptr, data + n, &type, &val)) + { + case 1: /* Here's an entry, check it. */ + if (type == match) + { + xfree (data); + *valp = val; + return 1; + } + break; + case 0: /* End of the vector. */ + xfree (data); + return 0; + default: /* Bogosity. */ + xfree (data); + return -1; + } + + /*NOTREACHED*/ +} + + +/* Print the contents of the target's AUXV on the specified file. */ +int +fprint_target_auxv (struct ui_file *file, struct target_ops *ops) +{ + CORE_ADDR type, val; + char *data; + int len = target_auxv_read (ops, &data); + char *ptr = data; + int ents = 0; + + if (len <= 0) + return len; + + while (target_auxv_parse (ops, &ptr, data + len, &type, &val) > 0) + { + extern int addressprint; + const char *name = "???"; + const char *description = ""; + enum { dec, hex, str } flavor = hex; + + switch (type) + { +#define TAG(tag, text, kind) \ + case tag: name = #tag; description = text; flavor = kind; break + TAG (AT_NULL, "End of vector", hex); + TAG (AT_IGNORE, "Entry should be ignored", hex); + TAG (AT_EXECFD, "File descriptor of program", dec); + TAG (AT_PHDR, "Program headers for program", hex); + TAG (AT_PHENT, "Size of program header entry", dec); + TAG (AT_PHNUM, "Number of program headers", dec); + TAG (AT_PAGESZ, "System page size", dec); + TAG (AT_BASE, "Base address of interpreter", hex); + TAG (AT_FLAGS, "Flags", hex); + TAG (AT_ENTRY, "Entry point of program", hex); + TAG (AT_NOTELF, "Program is not ELF", dec); + TAG (AT_UID, "Real user ID", dec); + TAG (AT_EUID, "Effective user ID", dec); + TAG (AT_GID, "Real group ID", dec); + TAG (AT_EGID, "Effective group ID", dec); + TAG (AT_CLKTCK, "Frequency of times()", dec); + TAG (AT_PLATFORM, "String identifying platform", str); + TAG (AT_HWCAP, "Machine-dependent CPU capability hints", hex); + TAG (AT_FPUCW, "Used FPU control word", dec); + TAG (AT_DCACHEBSIZE, "Data cache block size", dec); + TAG (AT_ICACHEBSIZE, "Instruction cache block size", dec); + TAG (AT_UCACHEBSIZE, "Unified cache block size", dec); + TAG (AT_IGNOREPPC, "Entry should be ignored", dec); + TAG (AT_SYSINFO, "Special system info/entry points", hex); + TAG (AT_SYSINFO_EHDR, "System-supplied DSO's ELF header", hex); + TAG (AT_SECURE, "Boolean, was exec setuid-like?", dec); + TAG (AT_SUN_UID, "Effective user ID", dec); + TAG (AT_SUN_RUID, "Real user ID", dec); + TAG (AT_SUN_GID, "Effective group ID", dec); + TAG (AT_SUN_RGID, "Real group ID", dec); + TAG (AT_SUN_LDELF, "Dynamic linker's ELF header", hex); + TAG (AT_SUN_LDSHDR, "Dynamic linker's section headers", hex); + TAG (AT_SUN_LDNAME, "String giving name of dynamic linker", str); + TAG (AT_SUN_LPAGESZ, "Large pagesize", dec); + TAG (AT_SUN_PLATFORM, "Platform name string", str); + TAG (AT_SUN_HWCAP, "Machine-dependent CPU capability hints", hex); + TAG (AT_SUN_IFLUSH, "Should flush icache?", dec); + TAG (AT_SUN_CPU, "CPU name string", str); + TAG (AT_SUN_EMUL_ENTRY, "COFF entry point address", hex); + TAG (AT_SUN_EMUL_EXECFD, "COFF executable file descriptor", dec); + TAG (AT_SUN_EXECNAME, + "Canonicalized file name given to execve", str); + TAG (AT_SUN_MMU, "String for name of MMU module", str); + TAG (AT_SUN_LDDATA, "Dynamic linker's data segment address", hex); + } + + fprintf_filtered (file, "%-4s %-20s %-30s ", + paddr_d (type), name, description); + switch (flavor) + { + case dec: + fprintf_filtered (file, "%s\n", paddr_d (val)); + break; + case hex: + fprintf_filtered (file, "0x%s\n", paddr_nz (val)); + break; + case str: + if (addressprint) + fprintf_filtered (file, "0x%s", paddr_nz (val)); + val_print_string (val, -1, 1, file); + fprintf_filtered (file, "\n"); + break; + } + ++ents; + } + + xfree (data); + + return ents; +} + +static void +info_auxv_command (char *cmd, int from_tty) +{ + + if (! target_has_stack) + error ("The program has no auxiliary information now."); + else + { + int ents = fprint_target_auxv (gdb_stdout, ¤t_target); + if (ents < 0) + error ("No auxilary vector found, or failed reading it."); + else if (ents == 0) + error ("Auxilary vector is empty."); + } +} + + +extern initialize_file_ftype _initialize_auxv; /* -Wmissing-prototypes; */ + +void +_initialize_auxv (void) +{ + add_info ("auxv", info_auxv_command, + "Display the inferior's auxiliary vector.\n\ +This is information provided by the operating system at program startup."); +} diff --git a/gdb/auxv.h b/gdb/auxv.h new file mode 100644 index 0000000..4ce0569 --- /dev/null +++ b/gdb/auxv.h @@ -0,0 +1,75 @@ +/* Auxiliary vector support for GDB, the GNU debugger. + + Copyright 2004 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. */ + +#ifndef AUXV_H +#define AUXV_H + +/* See "include/elf/common.h" for the definition of valid AT_* values. */ + + +/* Avoid miscellaneous includes in this file, so that it can be + included by nm-*.h for the procfs_xfer_auxv decl if that is + used in NATIVE_XFER_AUXV. */ +struct target_ops; /* Forward declaration. */ + + +/* Read all the auxv data into a contiguous xmalloc'd buffer, + stored in *DATA. Return the size in bytes of this data. + If zero, there is no data and *DATA is null. + if < 0, there was an error and *DATA is null. */ +extern LONGEST target_auxv_read (struct target_ops *ops, char **data); + +/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. + Return 0 if *READPTR is already at the end of the buffer. + Return -1 if there is insufficient buffer for a whole entry. + Return 1 if an entry was read into *TYPEP and *VALP. */ +extern int target_auxv_parse (struct target_ops *ops, + char **readptr, char *endptr, + CORE_ADDR *typep, CORE_ADDR *valp); + +/* Extract the auxiliary vector entry with a_type matching MATCH. + Return zero if no such entry was found, or -1 if there was + an error getting the information. On success, return 1 after + storing the entry's value field in *VALP. */ +extern int target_auxv_search (struct target_ops *ops, + CORE_ADDR match, CORE_ADDR *valp); + +/* Print the contents of the target's AUXV on the specified file. */ +extern int fprint_target_auxv (struct ui_file *file, struct target_ops *ops); + + +/* This function is called like a to_xfer_partial hook, + but must be called with TARGET_OBJECT_AUXV. + It handles access via /proc/PID/auxv, which is the common method. + This function is appropriate for doing: + #define NATIVE_XFER_AUXV procfs_xfer_auxv + for a native target that uses inftarg.c's child_xfer_partial hook. */ + +extern LONGEST procfs_xfer_auxv (struct target_ops *ops, + int /* enum target_object */ object, + const char *annex, + void *readbuf, + const void *writebuf, + ULONGEST offset, + LONGEST len); + + +#endif -- 2.7.4