60 lines
1.5 KiB
ArmAsm
60 lines
1.5 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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.cpu cortex-m4
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.syntax unified
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.thumb
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.text
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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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.global tzcall
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.type tzcall, %function
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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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.global SVC_Handler
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.type SVC_Handler, %function
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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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