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102 lines
3.1 KiB
102 lines
3.1 KiB
4 years ago
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2009-2013, ARM Ltd. All rights reserved.
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;------------------------------------------------------------------------------
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EXPORT SetJump
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EXPORT InternalLongJump
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AREA BaseLib_LowLevel, CODE, READONLY
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#define GPR_LAYOUT \
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REG_PAIR (x19, x20, #0); \
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REG_PAIR (x21, x22, #16); \
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REG_PAIR (x23, x24, #32); \
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REG_PAIR (x25, x26, #48); \
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REG_PAIR (x27, x28, #64); \
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REG_PAIR (x29, x30, #80);/*FP, LR*/ \
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REG_ONE (x16, #96) /*IP0*/
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#define FPR_LAYOUT \
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REG_PAIR ( d8, d9, #112); \
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REG_PAIR (d10, d11, #128); \
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REG_PAIR (d12, d13, #144); \
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REG_PAIR (d14, d15, #160);
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;/**
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; Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#
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;
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; Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial
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; call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero
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; value to be returned by SetJump().
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;
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; If JumpBuffer is NULL, then ASSERT().
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; For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
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;
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; @param JumpBuffer A pointer to CPU context buffer.
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;
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;**/
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;
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;UINTN
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;EFIAPI
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;SetJump (
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; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0
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; );
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;
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SetJump
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mov x16, sp // use IP0 so save SP
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#define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]
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#define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]
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GPR_LAYOUT
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FPR_LAYOUT
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#undef REG_PAIR
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#undef REG_ONE
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mov w0, #0
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ret
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;/**
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; Restores the CPU context that was saved with SetJump().#
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;
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; Restores the CPU context from the buffer specified by JumpBuffer.
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; This function never returns to the caller.
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; Instead is resumes execution based on the state of JumpBuffer.
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;
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; @param JumpBuffer A pointer to CPU context buffer.
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; @param Value The value to return when the SetJump() context is restored.
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;
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;**/
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;VOID
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;EFIAPI
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;InternalLongJump (
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; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0
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; IN UINTN Value // X1
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; );
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;
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InternalLongJump
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#define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]
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#define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]
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GPR_LAYOUT
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FPR_LAYOUT
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#undef REG_PAIR
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#undef REG_ONE
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mov sp, x16
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cmp w1, #0
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mov w0, #1
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beq exit
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mov w0, w1
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exit
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// use br not ret, as ret is guaranteed to mispredict
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br x30
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ASM_FUNCTION_REMOVE_IF_UNREFERENCED
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END
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