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ChibiOS
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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7400 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2014-10-15 15:03:19 +00:00
parent 40823c9995
commit b2ea156265
1 changed files with 87 additions and 1 deletions
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88
os/rt/ports/ARM/compilers/GCC/chcoreasm.s
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@ -126,6 +126,7 @@ _port_switch_thumb:
#endif /* defined(THUMB_PRESENT) */
.code 32
.func
.global _port_switch_arm
_port_switch_arm:
stmfd sp!, {r4, r5, r6, r7, r8, r9, r10, r11, lr}
@ -143,16 +144,38 @@ _port_switch_arm:
* of a register holding the address of the ISR to be invoked, the ISR
* then returns in the common epilogue code where the context switch will
* be performed, if required.
* Note that registers are saved in the system stack in order to have the
* IRQ stack empty if a context switch has to be performed.
*/
.code 32
.func
.global Irq_Handler
Irq_Handler:
msr CPSR_c, #MODE_SYS | I_BIT
stmfd sp!, {r0-r3, r12, lr} // Registers on System Stack.
msr CPSR_c, #MODE_IRQ | I_BIT
mrs r0, SPSR
mov r1, lr
msr CPSR_c, #MODE_SYS | I_BIT
stmfd sp!, {r0, r1} // Push R0=SPSR, R1=LR_IRQ.
msr CPSR_c, #MODE_IRQ | I_BIT
#if defined(THUMB_NO_INTERWORKING)
add r0, pc, #1
bx r0
.code 16
#endif
ldr r0, =ARM_IRQ_VECTOR_REG
ldr r0, [r0]
ldr lr, =_port_irq_common // ISR return point.
bx r0 // Calling the ISR.
#if 0
stmfd sp!, {r0-r3, r12, lr}
ldr r0, =ARM_IRQ_VECTOR_REG
ldr r0, [r0]
ldr lr, =_port_irq_common
bx r0
#endif
/*
* Common exit point for all IRQ routines, it performs the rescheduling if
@ -167,7 +190,7 @@ Irq_Handler:
* | r2 | | External context: IRQ handler frame
* | r1 | |
* | r0 | |
* | PC | | (user code return address)
* | LR_IRQ | | (user code return address)
* | PSR_USR | -+ (user code status)
* | .... | <- chSchDoReschedule() stack frame, optimize it for space
* | LR | -+ (system code return address)
@ -181,7 +204,48 @@ Irq_Handler:
* SP-> | r4 | -+
* Low +------------+
*/
#if defined(THUMB_NO_INTERWORKING)
.balign 16
.code 16
.thumb_func
#else /* !defined(THUMB_NO_INTERWORKING) */
.balign 16
.code 32
.func
#endif
.globl _port_irq_common
_port_irq_common:
bl chSchIsPreemptionRequired
cmp r0, #0
jne noschd
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_lock
#endif
bl chSchDoReschedule
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
noschd:
#if defined(THUMB_NO_INTERWORKING)
mov lr, pc
bx lr
.code 32
#endif
msr CPSR_c, #MODE_SYS | I_BIT
ldmfd sp!, {r0, r1} // Pop R0=SPSR, R1=LR_IRQ.
msr CPSR_c, #MODE_IRQ | I_BIT
msr SPSR_fsxc, r0
mov lr, r1
msr CPSR_c, #MODE_SYS | I_BIT
ldmfd sp!, {r0-r3, r12, lr}
msr CPSR_c, #MODE_IRQ | I_BIT
subs pc, lr, #4
#if 0
#if defined(THUMB_NO_INTERWORKING)
.code 16
.thumb_func
@ -247,6 +311,7 @@ _port_irq_common:
ldmfd sp!, {r0-r3, r12, lr}
msr CPSR_c, #MODE_IRQ | I_BIT
subs pc, lr, #4
#endif
/*
* Threads trampoline code.
@ -257,6 +322,26 @@ _port_irq_common:
.code 32
.globl _port_thread_start
_port_thread_start:
#if defined(THUMB_NO_INTERWORKING)
add r0, pc, #1
bx r0
.code 16
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
bl _port_unlock_thumb
#else /* !defined(THUMB_NO_INTERWORKING) */
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
msr CPSR_c, #MODE_SYS
#endif /* !defined(THUMB_NO_INTERWORKING) */
mov r0, r5
mov lr, pc
bx r4
bl chThdExit
#if 0
#if CH_DBG_SYSTEM_STATE_CHECK
#if defined(THUMB_NO_INTERWORKING)
add r0, pc, #1
@ -286,6 +371,7 @@ _port_thread_start:
jmpr4:
bx r4
#endif /* defined(THUMB_NO_INTERWORKING) */
#endif
#endif /* !defined(__DOXYGEN__) */