diff options
Diffstat (limited to 'src/common/android')
| -rw-r--r-- | src/common/android/breakpad_getcontext.S | 94 | ||||
| -rw-r--r-- | src/common/android/ucontext_constants.h | 24 |
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__) |