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Commit bdcff7d6 authored by Ben Cheng's avatar Ben Cheng
Browse files

Dump VFP registers and status word when native app crashes. 

Bug: 2226399
Caveat: d0/d1 appear to be clobbered by ptrace. It will be tracked by a new bug.
parent b202c54a

debuggerd/Android.mk

+12 −2
Original line number Diff line number Diff line
@@ -23,4 +23,14 @@ LOCAL_MODULE_TAGS := eng 
LOCAL_SHARED_LIBRARIES := libcutils libc

include $(BUILD_EXECUTABLE)



ifeq ($(TARGET_ARCH_VARIANT),armv7-a)

include $(CLEAR_VARS)

LOCAL_SRC_FILES := vfp-crasher.c vfp.S

LOCAL_MODULE := vfp-crasher

LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)

LOCAL_MODULE_TAGS := eng

LOCAL_SHARED_LIBRARIES := libcutils libc

include $(BUILD_EXECUTABLE)

endif # TARGET_ARCH_VARIANT == armv7-a



endif # TARGET_ARCH == arm

debuggerd/debuggerd.c

+18 −0
Original line number Diff line number Diff line
@@ -285,6 +285,24 @@ void dump_registers(int tfd, int pid, bool at_fault) 
    _LOG(tfd, only_in_tombstone,

         " ip %08x  sp %08x  lr %08x  pc %08x  cpsr %08x\n",

         r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);



#if __VFP_FP__

    struct user_vfp vfp_regs;

    int i;



    if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) {

        _LOG(tfd, only_in_tombstone,

             "cannot get registers: %s\n", strerror(errno));

        return;

    }



    for (i = 0; i < 32; i += 2) {

        _LOG(tfd, only_in_tombstone,

             " d%-2d %016llx  d%-2d %016llx\n",

              i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);

    }

    _LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr);

#endif

}



const char *get_signame(int sig)

debuggerd/vfp-crasher.c

0 → 100644
+7 −0
Original line number Diff line number Diff line 
int main()

{

  extern void crash(void);



  crash();

  return 0;

}

debuggerd/vfp.S

0 → 100644
+41 −0
Original line number Diff line number Diff line 
    .text

    .align 2

    .global crash

    .type crash, %function

crash:

    fconstd   d0, #0

    fconstd   d1, #1

    fconstd   d2, #2

    fconstd   d3, #3

    fconstd   d4, #4

    fconstd   d5, #5

    fconstd   d6, #6

    fconstd   d7, #7

    fconstd   d8, #8

    fconstd   d9, #9

    fconstd   d10, #10

    fconstd   d11, #11

    fconstd   d12, #12

    fconstd   d13, #13

    fconstd   d14, #14

    fconstd   d15, #15

    fconstd   d16, #16

    fconstd   d17, #17

    fconstd   d18, #18

    fconstd   d19, #19

    fconstd   d20, #20

    fconstd   d21, #21

    fconstd   d22, #22

    fconstd   d23, #23

    fconstd   d24, #24

    fconstd   d25, #25

    fconstd   d26, #26

    fconstd   d27, #27

    fconstd   d28, #28

    fconstd   d29, #29

    fconstd   d30, #30

    fconstd   d31, #31

    mov       r0, #0

    str       r0, [r0]

    bx        lr