Suyu/breakpad
1
0
Fork 0
mirror of https://git.suyu.dev/suyu/breakpad.git synced 2026-01-05 22:18:21 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add Arm64 version of breakpad_getcontext for Android.

Browse source 
This CL adds breakpad_getcontext support for Arm64 to Android. The assembly
is based on getcontext.S in glibc.

BUG=354405,335641
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1384002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1302 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
rmcilroy@chromium.org 2014-04-03 13:15:37 +00:00
parent 83b9a28cf9
commit 410b7024e3
6 changed files with 140 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

94
src/common/android/breakpad_getcontext.S
View file

@ -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