#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 <unistd.h>
#include <fcntl.h>
LONGEST
procfs_xfer_auxv (struct target_ops *ops,
int object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *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;
}
LONGEST
target_auxv_read (struct target_ops *ops, gdb_byte **data)
{
size_t auxv_alloc = 512, auxv_pos = 0;
gdb_byte *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)
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;
}
int
target_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
{
const int sizeof_auxv_field = TYPE_LENGTH (builtin_type_void_data_ptr);
gdb_byte *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;
}
int
target_auxv_search (struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp)
{
CORE_ADDR type, val;
gdb_byte *data;
int n = target_auxv_read (ops, &data);
gdb_byte *ptr = data;
if (n <= 0)
return n;
while (1)
switch (target_auxv_parse (ops, &ptr, data + n, &type, &val))
{
case 1:
if (type == match)
{
xfree (data);
*valp = val;
return 1;
}
break;
case 0:
xfree (data);
return 0;
default:
xfree (data);
return -1;
}
}
int
fprint_target_auxv (struct ui_file *file, struct target_ops *ops)
{
CORE_ADDR type, val;
gdb_byte *data;
int len = target_auxv_read (ops, &data);
gdb_byte *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 auxiliary vector found, or failed reading it."));
else if (ents == 0)
error (_("Auxiliary vector is empty."));
}
}
extern initialize_file_ftype _initialize_auxv;
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."));
}