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authorMichael Snyder <msnyder@specifix.com>2010-12-31 19:16:35 +0000
committerMichael Snyder <msnyder@specifix.com>2010-12-31 19:16:35 +0000
commit063d51569a462844484401166c2fb3a46691668a (patch)
tree201522edc0dc45c20d218f26be0771a4030becab /gdb/auxv.c
parent76c889a35e18796c235dd690f0bc9ed6b89e61e6 (diff)
downloadgdb-063d51569a462844484401166c2fb3a46691668a.tar.gz
2010-12-31 Michael Snyder <msnyder@vmware.com>
* annotate.c: Comment cleanup, shorten long lines. * arch-utils.c: Ditto. * arch-utils.h: Ditto. * auxv.c: Ditto. * auxv.h: Ditto. * ax-gdb.c: Ditto. * ax-gdb.h: Ditto. * ax-general.c: Ditto. * breakpoint.h: Ditto. * buildsym.h: Ditto.
Diffstat (limited to 'gdb/auxv.c')
-rw-r--r--gdb/auxv.c73
1 files changed, 40 insertions, 33 deletions
diff --git a/gdb/auxv.c b/gdb/auxv.c
index 71144dc6b69..68b1cbad1e3 100644
--- a/gdb/auxv.c
+++ b/gdb/auxv.c
@@ -34,8 +34,8 @@
#include <fcntl.h>
-/* This function handles access via /proc/PID/auxv, which is a common method
- for native targets. */
+/* This function handles access via /proc/PID/auxv, which is a common
+ method for native targets. */
static LONGEST
procfs_xfer_auxv (gdb_byte *readbuf,
@@ -90,35 +90,39 @@ ld_so_xfer_auxv (gdb_byte *readbuf,
if (MSYMBOL_SIZE (msym) != ptr_size)
return -1;
- /* POINTER_ADDRESS is a location where the `_dl_auxv' variable resides.
- DATA_ADDRESS is the inferior value present in `_dl_auxv', therefore the
- real inferior AUXV address. */
+ /* POINTER_ADDRESS is a location where the `_dl_auxv' variable
+ resides. DATA_ADDRESS is the inferior value present in
+ `_dl_auxv', therefore the real inferior AUXV address. */
pointer_address = SYMBOL_VALUE_ADDRESS (msym);
/* The location of the _dl_auxv symbol may no longer be correct if
- ld.so runs at a different address than the one present in the file.
- This is very common case - for unprelinked ld.so or with a PIE executable.
- PIE executable forces random address even for libraries already being
- prelinked to some address. PIE executables themselves are never prelinked
- even on prelinked systems. Prelinking of a PIE executable would block
- their purpose of randomizing load of everything including the executable.
-
- If the memory read fails, return -1 to fallback on another mechanism for
- retrieving the AUXV.
-
- In most cases of a PIE running under valgrind there is no way to find
- out the base addresses of any of ld.so, executable or AUXV as everything
- is randomized and /proc information is not relevant for the virtual
- executable running under valgrind. We think that we might need a valgrind
- extension to make it work. This is PR 11440. */
+ ld.so runs at a different address than the one present in the
+ file. This is very common case - for unprelinked ld.so or with a
+ PIE executable. PIE executable forces random address even for
+ libraries already being prelinked to some address. PIE
+ executables themselves are never prelinked even on prelinked
+ systems. Prelinking of a PIE executable would block their
+ purpose of randomizing load of everything including the
+ executable.
+
+ If the memory read fails, return -1 to fallback on another
+ mechanism for retrieving the AUXV.
+
+ In most cases of a PIE running under valgrind there is no way to
+ find out the base addresses of any of ld.so, executable or AUXV
+ as everything is randomized and /proc information is not relevant
+ for the virtual executable running under valgrind. We think that
+ we might need a valgrind extension to make it work. This is PR
+ 11440. */
if (target_read_memory (pointer_address, ptr_buf, ptr_size) != 0)
return -1;
data_address = extract_typed_address (ptr_buf, ptr_type);
- /* Possibly still not initialized such as during an inferior startup. */
+ /* Possibly still not initialized such as during an inferior
+ startup. */
if (data_address == 0)
return -1;
@@ -132,8 +136,8 @@ ld_so_xfer_auxv (gdb_byte *readbuf,
return -1;
}
- /* Stop if trying to read past the existing AUXV block. The final AT_NULL
- was already returned before. */
+ /* Stop if trying to read past the existing AUXV block. The final
+ AT_NULL was already returned before. */
if (offset >= auxv_pair_size)
{
@@ -154,9 +158,10 @@ ld_so_xfer_auxv (gdb_byte *readbuf,
if (block > len)
block = len;
- /* Reading sizes smaller than AUXV_PAIR_SIZE is not supported. Tails
- unaligned to AUXV_PAIR_SIZE will not be read during a call (they
- should be completed during next read with new/extended buffer). */
+ /* Reading sizes smaller than AUXV_PAIR_SIZE is not supported.
+ Tails unaligned to AUXV_PAIR_SIZE will not be read during a
+ call (they should be completed during next read with
+ new/extended buffer). */
block &= -auxv_pair_size;
if (block == 0)
@@ -174,8 +179,9 @@ ld_so_xfer_auxv (gdb_byte *readbuf,
data_address += block;
len -= block;
- /* Check terminal AT_NULL. This function is being called indefinitely
- being extended its READBUF until it returns EOF (0). */
+ /* Check terminal AT_NULL. This function is being called
+ indefinitely being extended its READBUF until it returns EOF
+ (0). */
while (block >= auxv_pair_size)
{
@@ -207,10 +213,11 @@ memory_xfer_auxv (struct target_ops *ops,
gdb_assert (object == TARGET_OBJECT_AUXV);
gdb_assert (readbuf || writebuf);
- /* ld_so_xfer_auxv is the only function safe for virtual executables being
- executed by valgrind's memcheck. Using ld_so_xfer_auxv during inferior
- startup is problematic, because ld.so symbol tables have not yet been
- relocated. So GDB uses this function only when attaching to a process.
+ /* ld_so_xfer_auxv is the only function safe for virtual
+ executables being executed by valgrind's memcheck. Using
+ ld_so_xfer_auxv during inferior startup is problematic, because
+ ld.so symbol tables have not yet been relocated. So GDB uses
+ this function only when attaching to a process.
*/
if (current_inferior ()->attach_flag != 0)
@@ -308,7 +315,7 @@ 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. */
+/* Print the contents of the target's AUXV on the specified file. */
int
fprint_target_auxv (struct ui_file *file, struct target_ops *ops)
{