84 lines
2.0 KiB
ArmAsm
84 lines
2.0 KiB
ArmAsm
/*
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* File : lwp_gcc.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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*/
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#define Mode_USR 0x10
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#define Mode_FIQ 0x11
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#define Mode_IRQ 0x12
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#define Mode_SVC 0x13
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#define Mode_MON 0x16
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#define Mode_ABT 0x17
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#define Mode_UDF 0x1B
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#define Mode_SYS 0x1F
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#define A_Bit 0x100
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#define I_Bit 0x80 @; when I bit is set, IRQ is disabled
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#define F_Bit 0x40 @; when F bit is set, FIQ is disabled
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#define T_Bit 0x20
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.cpu cortex-a9
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.syntax unified
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.text
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/*
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* void lwp_user_entry(args, text, data);
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*/
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.global lwp_user_entry
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.type lwp_user_entry, % function
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lwp_user_entry:
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mrs r9, cpsr
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bic r9, #0x1f
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orr r9, #Mode_USR
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cpsid i
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msr spsr, r9
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/* set data address. */
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mov r9, r2
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movs pc, r1
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/*
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* void SVC_Handler(void);
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*/
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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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push {lr}
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mrs lr, spsr
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push {r4, r5, lr}
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cpsie i
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push {r0 - r3, r12}
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and r0, r7, #0xff
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bl lwp_get_sys_api
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cmp r0, #0 /* r0 = api */
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mov lr, r0
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pop {r0 - r3, r12}
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beq svc_exit
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blx lr
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svc_exit:
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cpsid i
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pop {r4, r5, lr}
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msr spsr_cxsf, lr
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pop {lr}
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movs pc, lr
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