74 lines
1.6 KiB
ArmAsm
74 lines
1.6 KiB
ArmAsm
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;/*
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; * Copyright (c) 2006-2018, RT-Thread Development Team
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; *
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; * SPDX-License-Identifier: Apache-2.0
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; *
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; * Change Logs:
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; * Date Author Notes
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; * 2019-10-25 tyx first version
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; */
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AREA |.text|, CODE, READONLY, ALIGN=2
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THUMB
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REQUIRE8
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PRESERVE8
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IMPORT rt_secure_svc_handle
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;/*
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; * int tzcall(int id, rt_ubase_t arg0, rt_ubase_t arg1, rt_ubase_t arg2);
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; */
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tzcall PROC
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EXPORT tzcall
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SVC 1 ;call SVC 1
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BX LR
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ENDP
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tzcall_entry PROC
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PUSH {R1, R4, LR}
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MOV R4, R1 ; copy thread SP to R4
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LDMFD R4!, {r0 - r3} ; pop user stack, get input arg0, arg1, arg2
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STMFD R4!, {r0 - r3} ; push stack, user stack recovery
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BL rt_secure_svc_handle ; call fun
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POP {R1, R4, LR}
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STR R0, [R1] ; update return value
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BX LR ; return to thread
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ENDP
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syscall_entry PROC
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BX LR ; return to user app
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ENDP
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;/*
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; * void SVC_Handler(void);
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; */
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SVC_Handler PROC
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EXPORT SVC_Handler
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; get SP, save to R1
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MRS R1, MSP ;get fault context from handler
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TST LR, #0x04 ;if(!EXC_RETURN[2])
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BEQ get_sp_done
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MRS R1, PSP ;get fault context from thread
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get_sp_done
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; get svc index
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LDR R0, [R1, #24]
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LDRB R0, [R0, #-2]
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;if svc == 0, do system call
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CMP R0, #0x0
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BEQ syscall_entry
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;if svc == 1, do TrustZone call
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CMP R0, #0x1
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BEQ tzcall_entry
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ENDP
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ALIGN
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END
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