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Added trampoline to non secure world. 

Added smc handler.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@11312 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
isiora 2018-01-18 09:29:02 +00:00
parent 6dd5434799
commit ba2efe59c4
1 changed files with 38 additions and 9 deletions
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47
os/common/ports/ARMCAx-TZ/compilers/GCC/monitor.S
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@ -21,6 +21,9 @@
* @addtogroup ARM_CORE
* @{
*/
#define TRUE 1
#define FALSE 0
#define _FROM_ASM_
#include "chlicense.h"
#include "chconf.h"
@ -33,7 +36,7 @@
* state when a fiq interrupt is fired (sm_fiq).
* They originate by the monitor irq/fiq vector and run in monitor mode,
* ie in secure state.
* It assumes the following, set at boot time, or wherever it needs:
* It assumes the following, intially set at boot time, or wherever it needs:
* SCR.FW == 0 and SCR.FIQ == 1 and SCR.IRQ == 0 in non-secure state,
* ie FIQs are taken to monitor mode, IRQs are taken locally
* SCR.FW == 0 and SCR.FIQ == 0 and SCR.IRQ == 1 in secure state,
@ -93,7 +96,27 @@ _monitor_vectors:
* SMC entry
*/
sm_call:
b sm_call // Unhandled
ldr r12, =MON_S_SCR // enter in the secure world
mcr p15, 0, r12, c1, c1, 0
ands r0, r0 // OS special service,
// 0 == jump trampoline to non secure world
// r1 contains the address where it jumps
beq 1f
msr CPSR_c, #MODE_SYS | I_BIT // switch to sys mode, foreign int disabled
stmfd sp!, {lr} // save lr
bl smcEntry // call the C smc handler
ldmfd sp!, {lr} // restore lr
msr CPSR_c, #MODE_MON | I_BIT | F_BIT // switch to monitor mode
ldr r12, =MON_NS_SCR // enter in the non-secure world
mcr p15, 0, r12, c1, c1, 0
subs pc, lr, #0 // return from smc
1:
mov lr, r1 // use the address in r1 as return address
// in the non secure world
ldr r12, =MON_NS_SCR // enter in the non-secure world
mcr p15, 0, r12, c1, c1, 0
subs pc, lr, #0 // return from smc
/*
* FIQ entry
*
@ -109,11 +132,11 @@ sm_fiq:
// check point: SCR.NS == 1
stmfd sp!, {r0}
ldr r0, =MON_S_SCR // enter in the secure world
mrc p15, 0, r0, c1, c1, 0
mcr p15, 0, r0, c1, c1, 0
msr CPSR_c, #MODE_SYS | I_BIT // FIQ enabled, served via base table
msr CPSR_c, #MODE_MON | I_BIT | F_BIT // the handler returns here. Switch to monitor mode
ldr r0, =MON_NS_SCR // set non-secure SCR before return
mrc p15, 0, r0, c1, c1, 0
mcr p15, 0, r0, c1, c1, 0
ldmfd sp!, {r0}
subs pc, lr, #4 // return into non-secure world
/*
@ -123,9 +146,9 @@ sm_fiq:
* Current mode is monitor (so current state is secure),
* the previous mode and status is in mon.spsr and
* the return address+4 is in mon.lr.
* Because we are running in secure state, main thread is suspended in
* the smc handler.
* The main thread is resumed with MSG_TIMEOUT
* Because we are running in secure state, we are sure that
* the main thread is suspended in the smc handler.
* The main thread is then resumed with MSG_TIMEOUT
* The non secure IRQ handler has then the responsibility to return into
* secure state via a smc.
*
@ -142,12 +165,12 @@ sm_fiq:
// check point: ns_tread != 0
ldr r0, =_ns_thread
mov r1, #MSG_TIMEOUT
#if CH_DBG_SYSTEM_STATE_CHECK
#if (CH_DBG_SYSTEM_STATE_CHECK == TRUE)
bl _dbg_check_lock
#endif
bl chThdResumeS // resume the ns_thread and serve the IRQ
// into non-secure world
#if CH_DBG_SYSTEM_STATE_CHECK
#if (CH_DBG_SYSTEM_STATE_CHECK == TRUE)
bl _dbg_check_unlock
#endif
// The ns_thread reentered smc, that set SRC.NS to 0
@ -161,6 +184,12 @@ sm_fiq:
msr CPSR_c, #MODE_MON | I_BIT | F_BIT
subs pc, lr, #4 // return into secure world
.global _ns_trampoline
_ns_trampoline:
mov r1, r0
ldr r0, =#0
smc #0
#endif /* !defined(__DOXYGEN__) */
/** @} */