sambuc/atomthreads
1
0
Fork 0
mirror of https://github.com/kelvinlawson/atomthreads.git synced 2026-01-11 18:33:16 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

dm36x exception handler matches archIRQHandler()

Browse Source
This commit is contained in:
Kelvin Lawson
2015-11-03 23:58:59 +00:00
parent e1879ab56b
commit 9ae404ef47
2 changed files with 49 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
ports/arm/platforms/dm36x/atomport-private.c
View File

@@ -293,12 +293,12 @@ __interrupt_dispatcher (void)
/** /**
* \b null_handler * \b __null_handler
* *
* Handler to catch interrupts at uninitialised vectors. * Handler to catch interrupts at uninitialised vectors.
* *
*/ */
void null_handler (void) void __null_handler (void)
{ {
uart_write_halt ("Unhandled interrupt\n"); uart_write_halt ("Unhandled interrupt\n");
} }

53
ports/arm/platforms/dm36x/startup.s
View File

@@ -5,6 +5,8 @@
.extern __fiq_stack_top__ .extern __fiq_stack_top__
.extern __svc_stack_top__ .extern __svc_stack_top__
.extern __null_handler
.equ USR_MODE, 0x10 .equ USR_MODE, 0x10
.equ FIQ_MODE, 0x11 .equ FIQ_MODE, 0x11
@@ -21,13 +23,13 @@
__interrupt_vector_table: __interrupt_vector_table:
B Reset_Handler /* Reset */ B Reset_Handler /* Reset */
ldr PC,=null_handler /* Undefined */ ldr PC,=Exception_Handler /* Undefined */
ldr PC,=null_handler /* SWI */ ldr PC,=Exception_Handler /* SWI */
ldr PC,=null_handler /* Prefetch Abort */ ldr PC,=Exception_Handler /* Prefetch Abort */
ldr PC,=null_handler /* Data Abort */ ldr PC,=Exception_Handler /* Data Abort */
ldr PC,=null_handler /* reserved */ ldr PC,=Exception_Handler /* reserved */
ldr PC,=archIRQHandler/* IRQ */ ldr PC,=archIRQHandler/* IRQ */
ldr PC,=null_handler /* FIQ */ ldr PC,=Exception_Handler /* FIQ */
Reset_Handler: Reset_Handler:
@@ -42,6 +44,45 @@ Reset_Handler:
BL low_level_init BL low_level_init
BL _mainCRTStartup BL _mainCRTStartup
/**
* \b Exception_Handler
*
* IRQ entry point.
*
* Save the process/thread context onto its own stack before calling __interrupt_dispatcher().
* __interrupt_dispatcher() might switch stacks. On return the same context is popped from the
* stack and control is returned to the process.
*
* @return None
*/
Exception_Handler:
MSR cpsr_c, #(SVC_MODE | I_BIT) /* Save current process context in process stack */
STMFD sp!, {r0 - r3, ip, lr}
MSR cpsr_c, #(IRQ_MODE | I_BIT) /* Save lr_irq and spsr_irq in process stack */
SUB lr, lr, #4
MOV r1, lr
MRS r2, spsr
MSR cpsr_c, #(SVC_MODE | I_BIT)
STMFD sp!, {r1, r2}
BL __null_handler /* Dispatch the interrupt to platform folder for
the timer tick interrupt or a simular function
for other interrupts. Some of those IRQs may
call Atomthreads kernel routines and cause a
thread switch. */
LDMFD sp!, {r1, r2} /* Restore lr_irq and spsr_irq from process stack */
MSR cpsr_c, #(IRQ_MODE | I_BIT)
STMFD sp!, {r1}
MSR spsr_cxsf, r2
MSR cpsr_c, #(SVC_MODE | I_BIT) /* Restore process regs */
LDMFD sp!, {r0 - r3, ip, lr}
MSR cpsr_c, #(IRQ_MODE | I_BIT) /* Exit from IRQ */
LDMFD sp!, {pc}^
B . B .