Add support for tracing 32-bit ARM EABI binaries on AArch64

* defs.h [AARCH64]: Copy in the definition of arm_pt_regs and the
accessor macros, so it's possible to build on AArch64 without
ARM system headers.  Set SUPPORTED_PERSONALITIES to 2.
Define PERSONALITY0_WORDSIZE and PERSONALITY1_WORDSIZE.
Set DEFAULT_PERSONALITY to 1.
* linux/aarch64/errnoent1.h: New file, includes generic errnoent.h.
* linux/aarch64/ioctlent1.h: New file, includes generic ioctlent.h.
* linux/aarch64/signalent1.h: New file, includes generic signalent.h.
* linux/aarch64/syscallent1.h: Rename from linux/aarch64/syscallent.h.
* linux/aarch64/syscallent.h: New file, includes arm/syscallent.h.
* syscall.c [AARCH64]: Define aarch64_regs.
(update_personality) [AARCH64]: Add debug output.
(get_scno) [AARCH64]: Determine if we're in ARM or AArch64 mode by
checking the size of the returned uio structure from PTRACE_GETREGSET
and interpret the structure accordingly.
(get_syscall_result): Likewise.
(get_syscall_args): Merge the AArch64 and ARM sections so that on
AArch64 we can fall back to supporting the ARM personality.
(get_error): Likewise.

Signed-off-by: Steve McIntyre <steve.mcintyre@linaro.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/defs.h b/defs.h
index 11e26bb..0e05c6e 100644
--- a/defs.h
+++ b/defs.h
@@ -196,6 +196,30 @@ extern long ptrace(int, int, char *, long);
 # define REG_PC             (0*8)
 # define REG_SYSCALL        (2*8)
 #endif /* SH64 */
+#ifdef AARCH64
+#define NUM_ARM_REGS 18
+struct arm_pt_regs {
+        int uregs[NUM_ARM_REGS];
+};
+#define ARM_cpsr        uregs[16]
+#define ARM_pc          uregs[15]
+#define ARM_lr          uregs[14]
+#define ARM_sp          uregs[13]
+#define ARM_ip          uregs[12]
+#define ARM_fp          uregs[11]
+#define ARM_r10         uregs[10]
+#define ARM_r9          uregs[9]
+#define ARM_r8          uregs[8]
+#define ARM_r7          uregs[7]
+#define ARM_r6          uregs[6]
+#define ARM_r5          uregs[5]
+#define ARM_r4          uregs[4]
+#define ARM_r3          uregs[3]
+#define ARM_r2          uregs[2]
+#define ARM_r1          uregs[1]
+#define ARM_r0          uregs[0]
+#define ARM_ORIG_r0     uregs[17]
+#endif /* AARCH64 */
 
 #define SUPPORTED_PERSONALITIES 1
 #define DEFAULT_PERSONALITY 0
@@ -241,6 +265,16 @@ extern long ptrace(int, int, char *, long);
 # define PERSONALITY1_WORDSIZE 4
 #endif
 
+#ifdef AARCH64
+# undef SUPPORTED_PERSONALITIES
+/* The existing ARM personality, then AArch64 */
+# define SUPPORTED_PERSONALITIES 2
+# define PERSONALITY0_WORDSIZE 4
+# define PERSONALITY1_WORDSIZE 8
+# undef DEFAULT_PERSONALITY
+# define DEFAULT_PERSONALITY 1
+#endif
+
 #ifdef POWERPC64
 # undef SUPPORTED_PERSONALITIES
 # define SUPPORTED_PERSONALITIES 2