68 lines
1.7 KiB
ArmAsm
68 lines
1.7 KiB
ArmAsm
;/*
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; * Copyright (c) 2006-2022, 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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; * 2021-03-26 lxf modify bad instruction
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; */
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;/*
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; * @addtogroup cortex-m33
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; */
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SECTION .text:CODE(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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EXPORT tzcall
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tzcall:
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SVC 1 ;/* call SVC 1 */
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BX LR
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tzcall_entry:
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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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syscall_entry:
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BX LR ;/* return to user app */
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EXPORT SVC_Handler
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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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END
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