293 lines
6.3 KiB
ArmAsm
293 lines
6.3 KiB
ArmAsm
/*
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* Copyright (c) 2008-2015 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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INCLUDE config.h
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INCLUDE compiler.h
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EXTERN arm_undefined_handler
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EXTERN arm_prefetch_abort_handler
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EXTERN arm_data_abort_handler
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EXTERN arm_irq_handler
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EXTERN arm_fiq_handler
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PUBLIC Arm_Undefined_Handler
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PUBLIC Arm_SWI_Handler
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PUBLIC Arm_Prefetch_Handler
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PUBLIC Arm_Abort_Handler
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PUBLIC Arm_IRQ_Handler
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PUBLIC Arm_FIQ_Handler
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PUBLIC arm_save_mode_regs
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PUBLIC arm_reserved
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SECTION .text:CODE:ROOT(2)
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; macros to align and unalign the stack on 8 byte boundary for ABI compliance
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stack_align macro tempreg
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; make sure the stack is aligned
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mov tempreg, sp
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tst sp, #4
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subeq sp, #4
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push { tempreg }
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; tempreg holds the original stack
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endm
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stack_restore macro tempreg
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; restore the potentially unaligned stack
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pop { tempreg }
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mov sp, tempreg
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endm
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; save and disable the vfp unit
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vfp_save macro temp1
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; save old fpexc
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vmrs temp1, fpexc
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push { temp1 }
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; hard disable the vfp unit
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bic temp1, #(1<<30)
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vmsr fpexc, temp1
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endm
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; restore the vfp enable/disable state
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vfp_restore macro temp1
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; restore fpexc
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pop { temp1 }
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vmsr fpexc, temp1
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endm
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; Save callee trashed registers.
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; At exit r0 contains a pointer to the register frame.
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save macro
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; save spsr and r14 onto the svc stack
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srsdb #0x13!
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; switch to svc mode, interrupts disabled
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cpsid i,#0x13
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; save callee trashed regs and lr
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push { r0-r4, r12, lr }
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; save user space sp/lr
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sub sp, #8
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stmia sp, { r13, r14 }^
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#if CONFIG_ARCH_WITH_FPU
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; save and disable the vfp unit
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vfp_save r0
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#endif
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; make sure the stack is 8 byte aligned
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stack_align r0
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; r0 now holds the pointer to the original iframe (before alignment)
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endm
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save_offset macro offset
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sub lr, offset
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save
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endm
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restore macro
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; undo the stack alignment we did before
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stack_restore r0
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#if CONFIG_ARCH_WITH_FPU
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; restore the old state of the vfp unit
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vfp_restore r0
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#endif
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; restore user space sp/lr
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ldmia sp, { r13, r14 }^
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add sp, #8
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pop { r0-r4, r12, lr }
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; return to whence we came from
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rfeia sp!
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endm
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; Save all registers.
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; At exit r0 contains a pointer to the register frame.
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saveall macro
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; save spsr and r14 onto the svc stack
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srsdb #0x13!
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; switch to svc mode, interrupts disabled
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cpsid i,#0x13
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; save all regs
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push { r0-r12, lr }
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; save user space sp/lr
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sub sp, #8
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stmia sp, { r13, r14 }^
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#if CONFIG_ARCH_WITH_FPU
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; save and disable the vfp unit
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vfp_save r0
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#endif
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; make sure the stack is 8 byte aligned
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stack_align r0
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; r0 now holds the pointer to the original iframe (before alignment)
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endm
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saveall_offset macro offset
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sub lr, offset
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saveall
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endm
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restoreall macro
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; undo the stack alignment we did before
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stack_restore r0
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#if CONFIG_ARCH_WITH_FPU
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; restore the old state of the vfp unit
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vfp_restore r0
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#endif
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; restore user space sp/lr
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ldmia sp, { r13, r14 }^
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add sp, #8
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pop { r0-r12, r14 }
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; return to whence we came from
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rfeia sp!
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endm
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arm_save_mode_regs:
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mrs r1, cpsr
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stmia r0, { r13, r14 }^ /* usr */
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add r0, #8
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cps #0x11 /* fiq */
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str r13, [r0], #4
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str r14, [r0], #4
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cps #0x12 /* irq */
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str r13, [r0], #4
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str r14, [r0], #4
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cps #0x13 /* svc */
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str r13, [r0], #4
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str r14, [r0], #4
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cps #0x17 /* abt */
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str r13, [r0], #4
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str r14, [r0], #4
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cps #0x1b /* und */
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str r13, [r0], #4
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str r14, [r0], #4
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cps #0x1f /* sys */
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str r13, [r0], #4
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str r14, [r0], #4
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msr cpsr_c, r1
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bx lr
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Arm_Undefined_Handler:
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save
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; r0 now holds pointer to iframe
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bl arm_undefined_handler
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restore
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Arm_Prefetch_Handler:
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saveall_offset #4
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; r0 now holds pointer to iframe
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bl arm_prefetch_abort_handler
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restoreall
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Arm_Abort_Handler:
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saveall_offset #8
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; r0 now holds pointer to iframe
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bl arm_data_abort_handler
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restoreall
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Arm_SWI_Handler:
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/* not support */
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ldr r0,=Arm_SWI_Handler
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bx r0
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Arm_IRQ_Handler:
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sub lr, lr, #4
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srsdb #0x13!
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cpsid i,#0x13
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push {r0-r4, r12, lr}
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sub sp, #8
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stmia sp, {r13, r14}^
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mov r2, sp
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tst sp, #4
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subeq sp, #4
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push {r2}
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push {r0, lr}
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bl arm_irq_handler
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pop {r0, lr}
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pop {r2}
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mov sp, r2
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ldmia sp, {r13, r14}^
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add sp, #8
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pop {r0-r4, r12, lr}
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rfeia sp!
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Arm_FIQ_Handler:
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push {r0-r3, r12, lr}
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blx arm_fiq_handler
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pop {r0-r3, r12, lr}
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subs pc, lr, #4
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arm_reserved:
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b .
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END
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