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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
.macro LEAF_ENTRY Name, Section
.thumb_func
.global C_FUNC(\Name)
.type \Name, %function
C_FUNC(\Name):
.fnstart
.endm
.macro NESTED_ENTRY Name, Section, Handler
LEAF_ENTRY \Name, \Section
.ifnc \Handler, NoHandler
.personality C_FUNC(\Handler)
.endif
.endm
.macro NESTED_END Name, Section
LEAF_END \Name, \Section
.endm
.macro NESTED_END_MARKED Name, Section
LEAF_END_MARKED \Name, \Section
.endm
.macro PATCH_LABEL Name
.thumb_func
.global C_FUNC(\Name)
C_FUNC(\Name):
.endm
.macro LEAF_END Name, Section
.size \Name, .-\Name
.fnend
.endm
.macro LEAF_END_MARKED Name, Section
.thumb_func
.global C_FUNC(\Name\()_End)
C_FUNC(\Name\()_End):
LEAF_END \Name, \Section
.endm
.macro PREPARE_EXTERNAL_VAR Name, HelperReg
ldr \HelperReg, [pc, #C_FUNC(\Name)@GOTPCREL]
.endm
.macro push_nonvol_reg Register
push \Register
.save \Register
.endm
.macro pop_nonvol_reg Register
pop \Register
.endm
.macro vpush_nonvol_reg Register
vpush \Register
.vsave \Register
.endm
.macro vpop_nonvol_reg Register
vpop \Register
.endm
.macro alloc_stack Size
sub sp, sp, (\Size)
.pad #(\Size)
.endm
.macro free_stack Size
add sp, sp, (\Size)
.pad #-(\Size)
.endm
.macro POP_CALLEE_SAVED_REGISTERS
pop_nonvol_reg "{r4-r11, lr}"
.endm
.macro PUSH_CALLEE_SAVED_REGISTERS
push_nonvol_reg "{r4-r11, lr}"
.endm
.macro push_register Reg
push \Reg
.endm
.macro push_argument_register Reg
push_register \Reg
.endm
.macro PUSH_ARGUMENT_REGISTERS
push {r0-r3}
.save {r0-r3}
.endm
.macro pop_register Reg
pop \Reg
.endm
.macro pop_argument_register Reg
pop_register \Reg
.endm
.macro POP_ARGUMENT_REGISTERS
pop {r0-r3}
.endm
// Stack layout:
//
// (stack parameters)
// ...
// ArgumentRegisters::r3
// ArgumentRegisters::r2
// ArgumentRegisters::r1
// ArgumentRegisters::r0
// CalleeSavedRegisters::lr
// CalleeSavedRegisters::r11
// CalleeSavedRegisters::r10
// CalleeSavedRegisters::r9
// CalleeSavedRegisters::r8
// CalleeSavedRegisters::r7 <- r7
// CalleeSavedRegisters::r6
// CalleeSavedRegisters::r5
// CalleeSavedRegisters::r4 <- __PWTB_StackAlloc, __PWTB_TransitionBlock
// padding to align float save area
// d7
// d6
// d5
// d4
// d3
// d2
// d1
// d0 <- __PWTB_FloatArgumentRegisters
.macro PROLOG_WITH_TRANSITION_BLOCK extraLocals = 0, saveFpArgs = 1, pushArgRegs = 0
__PWTB_FloatArgumentRegisters = \extraLocals
__PWTB_SaveFPArgs = \saveFpArgs
.if (__PWTB_SaveFPArgs == 1)
.if ((__PWTB_FloatArgumentRegisters % 8) != 0)
__PWTB_FloatArgumentRegisters = __PWTB_FloatArgumentRegisters + 4
.endif
__PWTB_TransitionBlock = __PWTB_FloatArgumentRegisters + 8 * 8 + 4 // 8 floating point registers + padding
.else
.if ((__PWTB_FloatArgumentRegisters % 8) == 0)
__PWTB_FloatArgumentRegisters = __PWTB_FloatArgumentRegisters + 4
.endif
__PWTB_TransitionBlock = __PWTB_FloatArgumentRegisters
.endif
__PWTB_StackAlloc = __PWTB_TransitionBlock
.ifnc \pushArgRegs, DoNotPushArgRegs
PUSH_ARGUMENT_REGISTERS
.endif
PUSH_CALLEE_SAVED_REGISTERS
PROLOG_STACK_SAVE_OFFSET r7, #12
// let r7 point the saved r7 in the stack (clang FP style)
alloc_stack __PWTB_StackAlloc
.if (__PWTB_SaveFPArgs == 1)
add r6, sp, #(__PWTB_FloatArgumentRegisters)
vstm r6, {d0-d7}
.endif
CHECK_STACK_ALIGNMENT
END_PROLOGUE
.endm
.macro EPILOG_WITH_TRANSITION_BLOCK_RETURN
free_stack __PWTB_StackAlloc
POP_CALLEE_SAVED_REGISTERS
free_stack 16
bx lr
.endm
.macro EPILOG_WITH_TRANSITION_BLOCK_TAILCALL
.if (__PWTB_SaveFPArgs == 1)
add r6, sp, #(__PWTB_FloatArgumentRegisters)
vldm r6, {d0-d7}
.endif
free_stack __PWTB_StackAlloc
POP_CALLEE_SAVED_REGISTERS
POP_ARGUMENT_REGISTERS
.endm
.macro EMIT_BREAKPOINT
.inst.w 0xde01
.endm
.macro PROLOG_PUSH RegList
push_nonvol_reg "\RegList"
.endm
.macro PROLOG_VPUSH RegList
vpush_nonvol_reg "\RegList"
.endm
.macro PROLOG_STACK_SAVE Register
.setfp \Register, sp
mov \Register, sp
.endm
.macro PROLOG_STACK_SAVE_OFFSET Register, Offset
.setfp \Register, sp, \Offset
add \Register, sp, \Offset
.endm
.macro EPILOG_STACK_FREE Size
add sp, sp, \Size
.endm
.macro EPILOG_STACK_RESTORE Register
mov sp, \Register
.endm
.macro EPILOG_STACK_RESTORE_OFFSET Register, Offset
sub \Register, \Offset
mov sp, \Register
.endm
.macro EPILOG_BRANCH Target
b \Target
.endm
.macro EPILOG_BRANCH_REG reg
bx \reg
.endm
.macro EPILOG_POP RegList
pop_nonvol_reg "\RegList"
.endm
.macro EPILOG_VPOP RegList
vpop_nonvol_reg "\RegList"
.endm
//-----------------------------------------------------------------------------
// Macro used to check (in debug builds only) whether the stack is 64-bit aligned (a requirement before calling
// out into C++/OS code). Invoke this directly after your prolog (if the stack frame size is fixed) or directly
// before a call (if you have a frame pointer and a dynamic stack). A breakpoint will be invoked if the stack
// is misaligned.
//
.macro CHECK_STACK_ALIGNMENT
#ifdef _DEBUG
push {r0}
add r0, sp, #4
tst r0, #7
pop {r0}
beq 0f
EMIT_BREAKPOINT
0:
#endif
.endm
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