diff options
| author | Will Newton <will.newton@linaro.org> | 2014-01-27 09:01:03 +0000 |
|---|---|---|
| committer | Will Newton <will.newton@linaro.org> | 2014-02-25 10:07:04 +0000 |
| commit | 80a56cc3ee45d4a2a1c3ec5e67ff359a7b380fb6 (patch) | |
| tree | 7929367afdfbb5ccd9b062812aa9180e46cf8dcb /sysdeps/arm/setjmp.S | |
| parent | 3ea0f74e1d5a376eaa2905d4fe60fc0cca95e42f (diff) | |
| download | glibc-80a56cc3ee45d4a2a1c3ec5e67ff359a7b380fb6.zip glibc-80a56cc3ee45d4a2a1c3ec5e67ff359a7b380fb6.tar.gz glibc-80a56cc3ee45d4a2a1c3ec5e67ff359a7b380fb6.tar.bz2 | |
ARM: Add SystemTap probes to longjmp and setjmp.
Now the ARM port implements pointer encryption for jmpbufs, gdb needs
a SystemTap probe point in longjmp to determine the target PC of
a call to longjmp. This patch implements the probe point in longjmp
and a similar probe point in setjmp.
In order to have all the appropriate registers available to pass to the
probe this reorders the layout of jmpbuf, putting the sp and lr registers
at the start rather than the end, allowing them to be read and
written sequentially.
Tested on armv7, no new failures in the glibc testsuite and confirmed
that this fixes the gdb.base/longjmp.exp failures in the gdb testsuite.
ChangeLog:
2014-02-25 Will Newton <will.newton@linaro.org>
* sysdeps/arm/__longjmp.S: Include stap-probe.h.
(__longjmp): Restore sp and lr before restoring callee
saved registers. Add longjmp and longjmp_target
SystemTap probe point.
* sysdeps/arm/bits/setjmp.h (__jmp_buf): Update comment.
* sysdeps/arm/include/bits/setjmp.h (__JMP_BUF_SP):
Define to zero to match jmpbuf layout.
* sysdeps/arm/setjmp.S: Include stap-probe.h.
(__sigsetjmp): Save sp and lr before saving callee
saved registers. Add setjmp SystemTap probe point.
Diffstat (limited to 'sysdeps/arm/setjmp.S')
| -rw-r--r-- | sysdeps/arm/setjmp.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sysdeps/arm/setjmp.S b/sysdeps/arm/setjmp.S index b0b45ed..5e55ca5 100644 --- a/sysdeps/arm/setjmp.S +++ b/sysdeps/arm/setjmp.S @@ -17,6 +17,7 @@ <http://www.gnu.org/licenses/>. */ #include <sysdep.h> +#include <stap-probe.h> #include <bits/setjmp.h> #include <rtld-global-offsets.h> #include <arm-features.h> @@ -27,9 +28,11 @@ ENTRY (__sigsetjmp) #endif mov ip, r0 - /* Save registers */ - sfi_breg ip, \ - stmia \B!, JMP_BUF_REGLIST + /* setjmp probe expects sigsetjmp first argument (4@r0), second + argument (-4@r1), and target address (4@r14), respectively. */ + LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14) + + /* Save sp and lr */ #ifdef PTR_MANGLE mov a4, sp PTR_MANGLE2 (a4, a4, a3) @@ -40,6 +43,9 @@ ENTRY (__sigsetjmp) str sp, [ip], #4 str lr, [ip], #4 #endif + /* Save registers */ + sfi_breg ip, \ + stmia \B!, JMP_BUF_REGLIST #if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__ # define NEED_HWCAP 1 |