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authorJames Hogan <james.hogan@imgtec.com>2014-09-01 22:48:40 +0100
committerMaciej W. Rozycki <macro@codesourcery.com>2014-09-03 22:09:10 +0100
commitac740bc7a9103a561329ebf7aa05ff31bcab2267 (patch)
tree6b3243a23c0c7bddbfcfdbe9eeaa11ee97798f67 /gdb
parentPR python/16699: GDB Python command completion with overriden complete vs. co... (diff)
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Reset errno before PTRACE_PEEKUSER for MIPS DSP_CONTROL
PTRACE_PEEKUSER can return -1, which is usually used to determine whether a system call has reported an error, so errno must be used alone to determine whether an error occurred. However errno isn't modified by a successful system call so it must be reset to a known value (0) before the syscall call. Add the missing errno reset when reading the DSP_CONTROL register in the native MIPS Linux backend and the MIPS gdbserver backend. gdb/: * mips-linux-nat.c (mips_linux_read_description): Reset errno to 0 prior to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call. gdb/gdbserver/: * linux-mips-low.c (mips_read_description): Reset errno to 0 prior to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call.
Diffstat (limited to 'gdb')
-rw-r--r--gdb/ChangeLog5
-rw-r--r--gdb/gdbserver/ChangeLog5
-rw-r--r--gdb/gdbserver/linux-mips-low.c1
-rw-r--r--gdb/mips-linux-nat.c1
4 files changed, 12 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d4166233495..ad1a87b7821 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-03 James Hogan <james.hogan@imgtec.com>
+
+ * mips-linux-nat.c (mips_linux_read_description): Reset errno to 0
+ prior to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call.
+
2014-09-03 Sergio Durigan Junior <sergiodj@redhat.com>
PR python/16699
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index a47ef492293..3fb143c2cb3 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-03 James Hogan <james.hogan@imgtec.com>
+
+ * linux-mips-low.c (mips_read_description): Reset errno to 0 prior
+ to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call.
+
2014-09-03 Gary Benson <gbenson@redhat.com>
* linux-x86-low.c (x86_linux_prepare_to_resume): Use
diff --git a/gdb/gdbserver/linux-mips-low.c b/gdb/gdbserver/linux-mips-low.c
index 1b2160b3537..377284be542 100644
--- a/gdb/gdbserver/linux-mips-low.c
+++ b/gdb/gdbserver/linux-mips-low.c
@@ -128,6 +128,7 @@ mips_read_description (void)
{
int pid = lwpid_of (current_inferior);
+ errno = 0;
ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0);
switch (errno)
{
diff --git a/gdb/mips-linux-nat.c b/gdb/mips-linux-nat.c
index 88faa1edf69..ffc8411ca3b 100644
--- a/gdb/mips-linux-nat.c
+++ b/gdb/mips-linux-nat.c
@@ -439,6 +439,7 @@ mips_linux_read_description (struct target_ops *ops)
if (tid == 0)
tid = ptid_get_pid (inferior_ptid);
+ errno = 0;
ptrace (PTRACE_PEEKUSER, tid, DSP_CONTROL, 0);
switch (errno)
{