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-rw-r--r--src/common/android/breakpad_getcontext.S94
-rw-r--r--src/common/android/ucontext_constants.h24
2 files changed, 109 insertions, 9 deletions
diff --git a/src/common/android/breakpad_getcontext.S b/src/common/android/breakpad_getcontext.S
index 849ffaf6..b41cb05c 100644
--- a/src/common/android/breakpad_getcontext.S
+++ b/src/common/android/breakpad_getcontext.S
@@ -34,7 +34,7 @@
/* int getcontext (ucontext_t *ucp) */
-#ifdef __arm__
+#if defined(__arm__)
.text
.global breakpad_getcontext
@@ -50,7 +50,7 @@ breakpad_getcontext:
/* r12 is a scratch register, don't save it */
- /* Save sp and lr explicitely. */
+ /* Save sp and lr explicitly. */
/* - sp can't be stored with stmia in Thumb-2 */
/* - STM instructions that store sp and pc are deprecated in ARM */
str sp, [r0, #(MCONTEXT_GREGS_OFFSET + 13*4)]
@@ -59,7 +59,7 @@ breakpad_getcontext:
/* Save the caller's address in 'pc' */
str lr, [r0, #(MCONTEXT_GREGS_OFFSET + 15*4)]
- /* Save ucontext_t* pointer accross next call */
+ /* Save ucontext_t* pointer across next call */
mov r4, r0
/* Call sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
@@ -88,6 +88,90 @@ breakpad_getcontext:
.fnend
.size breakpad_getcontext, . - breakpad_getcontext
+#elif defined(__aarch64__)
+
+ .text
+ .global breakpad_getcontext
+ .hidden breakpad_getcontext
+ .type breakpad_getcontext, #function
+ .align 4
+ .cfi_startproc
+breakpad_getcontext:
+
+ /* The saved context will return to the getcontext() call point
+ with a return value of 0 */
+ str xzr, [x0, MCONTEXT_GREGS_OFFSET + 0 * REGISTER_SIZE]
+
+ stp x18, x19, [x0, MCONTEXT_GREGS_OFFSET + 18 * REGISTER_SIZE]
+ stp x20, x21, [x0, MCONTEXT_GREGS_OFFSET + 20 * REGISTER_SIZE]
+ stp x22, x23, [x0, MCONTEXT_GREGS_OFFSET + 22 * REGISTER_SIZE]
+ stp x24, x25, [x0, MCONTEXT_GREGS_OFFSET + 24 * REGISTER_SIZE]
+ stp x26, x27, [x0, MCONTEXT_GREGS_OFFSET + 26 * REGISTER_SIZE]
+ stp x28, x29, [x0, MCONTEXT_GREGS_OFFSET + 28 * REGISTER_SIZE]
+ str x30, [x0, MCONTEXT_GREGS_OFFSET + 30 * REGISTER_SIZE]
+
+ /* Place LR into the saved PC, this will ensure that when
+ switching to this saved context with setcontext() control
+ will pass back to the caller of getcontext(), we have
+ already arranged to return the appropriate return value in x0
+ above. */
+ str x30, [x0, MCONTEXT_PC_OFFSET]
+
+ /* Save the current SP */
+ mov x2, sp
+ str x2, [x0, MCONTEXT_SP_OFFSET]
+
+ /* Initialize the pstate. */
+ str xzr, [x0, MCONTEXT_PSTATE_OFFSET]
+
+ /* Figure out where to place the first context extension
+ block. */
+ add x2, x0, #MCONTEXT_EXTENSION_OFFSET
+
+ /* Write the context extension fpsimd header. */
+ mov w3, #(FPSIMD_MAGIC & 0xffff)
+ movk w3, #(FPSIMD_MAGIC >> 16), lsl #16
+ str w3, [x2, #FPSIMD_CONTEXT_MAGIC_OFFSET]
+ mov w3, #FPSIMD_CONTEXT_SIZE
+ str w3, [x2, #FPSIMD_CONTEXT_SIZE_OFFSET]
+
+ /* Fill in the FP SIMD context. */
+ add x3, x2, #(FPSIMD_CONTEXT_VREGS_OFFSET + 8 * SIMD_REGISTER_SIZE)
+ stp d8, d9, [x3], #(2 * SIMD_REGISTER_SIZE)
+ stp d10, d11, [x3], #(2 * SIMD_REGISTER_SIZE)
+ stp d12, d13, [x3], #(2 * SIMD_REGISTER_SIZE)
+ stp d14, d15, [x3], #(2 * SIMD_REGISTER_SIZE)
+
+ add x3, x2, FPSIMD_CONTEXT_FPSR_OFFSET
+
+ mrs x4, fpsr
+ str w4, [x3]
+
+ mrs x4, fpcr
+ str w4, [x3, FPSIMD_CONTEXT_FPCR_OFFSET - FPSIMD_CONTEXT_FPSR_OFFSET]
+
+ /* Write the termination context extension header. */
+ add x2, x2, #FPSIMD_CONTEXT_SIZE
+
+ str xzr, [x2, #FPSIMD_CONTEXT_MAGIC_OFFSET]
+ str xzr, [x2, #FPSIMD_CONTEXT_SIZE_OFFSET]
+
+ /* Grab the signal mask */
+ /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
+ add x2, x0, #UCONTEXT_SIGMASK_OFFSET
+ mov x0, #0 /* SIG_BLOCK */
+ mov x1, #0 /* NULL */
+ mov x3, #(_NSIG / 8)
+ mov x8, #__NR_rt_sigprocmask
+ svc 0
+
+ /* Return x0 for success */
+ mov x0, 0
+ ret
+
+ .cfi_endproc
+ .size breakpad_getcontext, . - breakpad_getcontext
+
#elif defined(__i386__)
.text
@@ -140,10 +224,6 @@ breakpad_getcontext:
.size breakpad_getcontext, . - breakpad_getcontext
-#elif defined(__aarch64__)
-
- // TODO(rmcilroy): Implement for arm64.
-
#elif defined(__mips__)
#if _MIPS_SIM != _ABIO32
diff --git a/src/common/android/ucontext_constants.h b/src/common/android/ucontext_constants.h
index 87069517..4b00ae23 100644
--- a/src/common/android/ucontext_constants.h
+++ b/src/common/android/ucontext_constants.h
@@ -47,8 +47,28 @@
#elif defined(__aarch64__)
-#define MCONTEXT_GREGS_OFFSET 56
-#define UCONTEXT_SIGMASK_OFFSET 40
+#define UCONTEXT_SIGMASK_OFFSET 40
+
+#define MCONTEXT_GREGS_OFFSET 56
+#define MCONTEXT_SP_OFFSET 304
+#define MCONTEXT_PC_OFFSET 312
+#define MCONTEXT_PSTATE_OFFSET 320
+#define MCONTEXT_EXTENSION_OFFSET 336
+
+#define FPSIMD_MAGIC 0x46508001
+
+#define FPSIMD_CONTEXT_MAGIC_OFFSET 0
+#define FPSIMD_CONTEXT_SIZE_OFFSET 4
+#define FPSIMD_CONTEXT_FPSR_OFFSET 8
+#define FPSIMD_CONTEXT_FPCR_OFFSET 12
+#define FPSIMD_CONTEXT_VREGS_OFFSET 16
+#define FPSIMD_CONTEXT_SIZE 528
+
+#define REGISTER_SIZE 8
+#define SIMD_REGISTER_SIZE 16
+
+#define _NSIG 64
+#define __NR_rt_sigprocmask 135
#elif defined(__i386__)