mirror of
https://github.com/chromium/crashpad.git
synced 2025-01-08 13:15:50 +08:00
65 lines
1.9 KiB
NASM
65 lines
1.9 KiB
NASM
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; Copyright 2019 The Crashpad Authors. All rights reserved.
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;
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; Licensed under the Apache License, Version 2.0 (the "License");
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; you may not use this file except in compliance with the License.
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; You may obtain a copy of the License at
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;
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; http://www.apache.org/licenses/LICENSE-2.0
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;
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; Unless required by applicable law or agreed to in writing, software
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; distributed under the License is distributed on an "AS IS" BASIS,
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; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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; See the License for the specific language governing permissions and
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; limitations under the License.
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EXPORT |?CaptureContext@crashpad@@YAXPEAU_CONTEXT@@@Z|
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AREA |.text|, CODE
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|?CaptureContext@crashpad@@YAXPEAU_CONTEXT@@@Z| PROC
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; Save general purpose registers in context.regs[i].
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; The original x0 can't be recovered.
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stp x0, x1, [x0, #0x008]
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stp x2, x3, [x0, #0x018]
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stp x4, x5, [x0, #0x028]
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stp x6, x7, [x0, #0x038]
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stp x8, x9, [x0, #0x048]
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stp x10, x11, [x0, #0x058]
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stp x12, x13, [x0, #0x068]
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stp x14, x15, [x0, #0x078]
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stp x16, x17, [x0, #0x088]
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stp x18, x19, [x0, #0x098]
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stp x20, x21, [x0, #0x0a8]
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stp x22, x23, [x0, #0x0b8]
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stp x24, x25, [x0, #0x0c8]
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stp x26, x27, [x0, #0x0d8]
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stp x28, x29, [x0, #0x0e8]
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; The original LR can't be recovered.
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str LR, [x0, #0x0f8]
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; Use x1 as a scratch register.
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mov x1, SP
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str x1, [x0, #0x100] ; context.sp
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; The link register holds the return address for this function.
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str LR, [x0, #0x108] ; context.pc
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; pstate should hold SPSR but NZCV are the only bits we know about.
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mrs x1, NZCV
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; Enable Control flags, such as CONTEXT_ARM64, CONTEXT_CONTROL,
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; CONTEXT_INTEGER
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ldr w1, =0x00400003
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; Set ControlFlags /0x000/ and pstate /0x004/ at the same time.
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str x1, [x0, #0x000]
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; Restore x1 from the saved context.
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ldr x1, [x0, #0x010]
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; TODO(https://crashpad.chromium.org/bug/300): save floating-point registers
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ret
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ENDP
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END
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