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authorMark Kettenis <kettenis@gnu.org>2002-11-08 23:48:38 +0000
committerMark Kettenis <kettenis@gnu.org>2002-11-08 23:48:38 +0000
commit371a6e84e5b12ed0c971ec604cfe60b8e978372c (patch)
treee0fbdf51e3a0c053d1c7cf4edca13a4f7489ab09 /gdb/infptrace.c
parent94ba925ab94e45314d60f194da98418f08149eed (diff)
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* infptrace.c (child_xfer_memory): Make use of the new PT_IO
request that's available in *BSD.
Diffstat (limited to 'gdb/infptrace.c')
-rw-r--r--gdb/infptrace.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/gdb/infptrace.c b/gdb/infptrace.c
index 777a5b4..601e157 100644
--- a/gdb/infptrace.c
+++ b/gdb/infptrace.c
@@ -514,6 +514,37 @@ child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
PTRACE_XFER_TYPE *buffer;
struct cleanup *old_chain = NULL;
+#ifdef PT_IO
+ /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request
+ that promises to be much more efficient in reading and writing
+ data in the traced process's address space. */
+
+ {
+ struct ptrace_io_desc piod;
+
+ /* NOTE: We assume that there are no distinct address spaces for
+ instruction and data. */
+ piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
+ piod.piod_offs = (void *) memaddr;
+ piod.piod_addr = myaddr;
+ piod.piod_len = len;
+
+ if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1)
+ {
+ /* If the PT_IO request is somehow not supported, fallback on
+ using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
+ to indicate failure. */
+ if (errno != EINVAL)
+ return 0;
+ }
+ else
+ {
+ /* Return the actual number of bytes read or written. */
+ return piod.piod_len;
+ }
+ }
+#endif
+
/* Allocate buffer of that many longwords. */
if (len < GDB_MAX_ALLOCA)
{