mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-10 14:23:31 +01:00
96 lines
2.9 KiB
NASM
96 lines
2.9 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2009-2013, ARM Ltd. All rights reserved.
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
EXPORT SetJump
|
|
EXPORT InternalLongJump
|
|
AREA BaseLib_LowLevel, CODE, READONLY
|
|
|
|
#define GPR_LAYOUT \
|
|
REG_PAIR (x19, x20, #0); \
|
|
REG_PAIR (x21, x22, #16); \
|
|
REG_PAIR (x23, x24, #32); \
|
|
REG_PAIR (x25, x26, #48); \
|
|
REG_PAIR (x27, x28, #64); \
|
|
REG_PAIR (x29, x30, #80);/*FP, LR*/ \
|
|
REG_ONE (x16, #96) /*IP0*/
|
|
|
|
#define FPR_LAYOUT \
|
|
REG_PAIR ( d8, d9, #112); \
|
|
REG_PAIR (d10, d11, #128); \
|
|
REG_PAIR (d12, d13, #144); \
|
|
REG_PAIR (d14, d15, #160);
|
|
|
|
;/**
|
|
; Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#
|
|
;
|
|
; Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial
|
|
; call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero
|
|
; value to be returned by SetJump().
|
|
;
|
|
; If JumpBuffer is NULL, then ASSERT().
|
|
; For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
|
|
;
|
|
; @param JumpBuffer A pointer to CPU context buffer.
|
|
;
|
|
;**/
|
|
;
|
|
;UINTN
|
|
;EFIAPI
|
|
;SetJump (
|
|
; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0
|
|
; );
|
|
;
|
|
SetJump
|
|
mov x16, sp // use IP0 so save SP
|
|
#define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]
|
|
#define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]
|
|
GPR_LAYOUT
|
|
FPR_LAYOUT
|
|
#undef REG_PAIR
|
|
#undef REG_ONE
|
|
mov w0, #0
|
|
ret
|
|
|
|
;/**
|
|
; Restores the CPU context that was saved with SetJump().#
|
|
;
|
|
; Restores the CPU context from the buffer specified by JumpBuffer.
|
|
; This function never returns to the caller.
|
|
; Instead is resumes execution based on the state of JumpBuffer.
|
|
;
|
|
; @param JumpBuffer A pointer to CPU context buffer.
|
|
; @param Value The value to return when the SetJump() context is restored.
|
|
;
|
|
;**/
|
|
;VOID
|
|
;EFIAPI
|
|
;InternalLongJump (
|
|
; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0
|
|
; IN UINTN Value // X1
|
|
; );
|
|
;
|
|
InternalLongJump
|
|
#define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]
|
|
#define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]
|
|
GPR_LAYOUT
|
|
FPR_LAYOUT
|
|
#undef REG_PAIR
|
|
#undef REG_ONE
|
|
mov sp, x16
|
|
cmp w1, #0
|
|
mov w0, #1
|
|
beq exit
|
|
mov w0, w1
|
|
exit
|
|
// use br not ret, as ret is guaranteed to mispredict
|
|
br x30
|
|
|
|
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
|
|
|
|
END
|
|
|