Improve ARM CPU info reporting.

This patch improves several things for Linux/ARM:

- Better detection of the number of CPUs on the target
  device. The content of /proc/cpuinfo only matches the
  number of "online" CPUs, which varies over time with
  recent Android devices.

- Reconstruct the CPUID and ELF hwcaps values from
  /proc/cpuinfo, this is useful to better identify
  target devices in minidumps.

- Make minidump_dump display the new information
  in useful ways.

- Write a small helper class to parse /proc/cpuinfo
  and also use it for x86/64.

- Write a small helper class to parse sysfds cpu lists.

- Add a my_memchr() implementation.

- Add unit tests.

Tested on a Nexus S (1 CPU), Galaxy Nexus (2 CPUs)
and a Nexus 4 (4 CPUs).

Review URL: https://breakpad.appspot.com/540003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1160 4c0a9323-5329-0410-9bdc-e9ce6186880e

1 files changed, 29 insertions, 1 deletions

diff --git a/src/google_breakpad/common/minidump_format.h b/src/google_breakpad/common/minidump_format.h
index 7fb8c5d5..f1a65cbf 100644
--- a/src/google_breakpad/common/minidump_format.h
+++ b/src/google_breakpad/common/minidump_format.h
@@ -552,18 +552,47 @@ typedef union {
     uint32_t amd_extended_cpu_features;  /* cpuid 0x80000001, ebx */
   } x86_cpu_info;
   struct {
+    uint32_t cpuid;
+    uint32_t elf_hwcaps;    /* linux specific, 0 otherwise */
+  } arm_cpu_info;
+  struct {
     uint64_t processor_features[2];
   } other_cpu_info;
 } MDCPUInformation;  /* CPU_INFORMATION */
 
+/* For (MDCPUInformation).arm_cpu_info.elf_hwcaps.
+ * This matches the Linux kernel definitions from <asm/hwcaps.h> */
+typedef enum {
+  MD_CPU_ARM_ELF_HWCAP_SWP       = (1 << 0),
+  MD_CPU_ARM_ELF_HWCAP_HALF      = (1 << 1),
+  MD_CPU_ARM_ELF_HWCAP_THUMB     = (1 << 2),
+  MD_CPU_ARM_ELF_HWCAP_26BIT     = (1 << 3),
+  MD_CPU_ARM_ELF_HWCAP_FAST_MULT = (1 << 4),
+  MD_CPU_ARM_ELF_HWCAP_FPA       = (1 << 5),
+  MD_CPU_ARM_ELF_HWCAP_VFP       = (1 << 6),
+  MD_CPU_ARM_ELF_HWCAP_EDSP      = (1 << 7),
+  MD_CPU_ARM_ELF_HWCAP_JAVA      = (1 << 8),
+  MD_CPU_ARM_ELF_HWCAP_IWMMXT    = (1 << 9),
+  MD_CPU_ARM_ELF_HWCAP_CRUNCH    = (1 << 10),
+  MD_CPU_ARM_ELF_HWCAP_THUMBEE   = (1 << 11),
+  MD_CPU_ARM_ELF_HWCAP_NEON      = (1 << 12),
+  MD_CPU_ARM_ELF_HWCAP_VFPv3     = (1 << 13),
+  MD_CPU_ARM_ELF_HWCAP_VFPv3D16  = (1 << 14),
+  MD_CPU_ARM_ELF_HWCAP_TLS       = (1 << 15),
+  MD_CPU_ARM_ELF_HWCAP_VFPv4     = (1 << 16),
+  MD_CPU_ARM_ELF_HWCAP_IDIVA     = (1 << 17),
+  MD_CPU_ARM_ELF_HWCAP_IDIVT     = (1 << 18),
+} MDCPUInformationARMElfHwCaps;
 
 typedef struct {
   /* The next 3 fields and numberOfProcessors are from the SYSTEM_INFO
    * structure as returned by GetSystemInfo */
   uint16_t         processor_architecture;
   uint16_t         processor_level;         /* x86: 5 = 586, 6 = 686, ... */
+                                            /* ARM: 6 = ARMv6, 7 = ARMv7 ... */
   uint16_t         processor_revision;      /* x86: 0xMMSS, where MM=model,
                                              *      SS=stepping */
+                                            /* ARM: 0 */
 
   uint8_t          number_of_processors;
   uint8_t          product_type;            /* Windows: VER_NT_* from WinNT.h */
@@ -626,7 +655,6 @@ typedef enum {
   MD_OS_ANDROID       = 0x8203   /* Android */
 } MDOSPlatform;
 
-
 typedef struct {
   uint32_t size_of_info;  /* Length of entire MDRawMiscInfo structure. */
   uint32_t flags1;