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98 lines
3.1 KiB
98 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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.text
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.p2align 3
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GCC_ASM_EXPORT(SetJump)
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GCC_ASM_EXPORT(InternalLongJump)
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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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ASM_PFX(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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ASM_PFX(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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csel w0, w1, w0, ne
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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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