diff options
Diffstat (limited to 'nuttx/arch/mips/src/pic32mx/pic32mx-head.S')
| -rw-r--r-- | nuttx/arch/mips/src/pic32mx/pic32mx-head.S | 220 |
1 files changed, 193 insertions, 27 deletions
diff --git a/nuttx/arch/mips/src/pic32mx/pic32mx-head.S b/nuttx/arch/mips/src/pic32mx/pic32mx-head.S index e474d57e7..e52e2549f 100644 --- a/nuttx/arch/mips/src/pic32mx/pic32mx-head.S +++ b/nuttx/arch/mips/src/pic32mx/pic32mx-head.S @@ -40,9 +40,10 @@ #include <nuttx/config.h> #include <arch/mips32/registers.h> -#include <arch/mips32/cp0.h> #include <arch/pic32mx/cp0.h> +#include "excptmacros.h" + /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ @@ -71,30 +72,61 @@ * 4) Uninitialized data (.bss): * Start: _sbss * End(+1): _ebss + * + * The following are placed outside of the "normal" memory segments -- mostly + * so that they do not have to be cleared on power up. + * * 5) Idle thread stack: * Start: _ebss * End(+1): _ebss+CONFIG_IDLETHREAD_STACKSIZE - * 6) Heap Range + * 6) Optional interrupt stack * Start: _ebss+CONFIG_IDLETHREAD_STACKSIZE + * End(+1): _ebss+CONFIG_IDLETHREAD_STACKSIZE+(CONFIG_ARCH_INTERRUPTSTACK & ~3) + * 6a) Heap (without interupt stack) + * Start: _ebss+CONFIG_IDLETHREAD_STACKSIZE + * End(+1): to the end of memory + * 6b) Heap (with interupt stack) + * Start: _ebss+CONFIG_IDLETHREAD_STACKSIZE+(CONFIG_ARCH_INTERRUPTSTACK & ~3) * End(+1): to the end of memory */ -#define PIC32MX_STACK_BASE _ebss -#define PIC32MX_STACK_TOP _ebss+CONFIG_IDLETHREAD_STACKSIZE-4 -#define PIC32MX_HEAP_BASE _ebss+CONFIG_IDLETHREAD_STACKSIZE +#define PIC32MX_STACK_BASE _ebss +#define PIC32MX_STACK_TOP _ebss+CONFIG_IDLETHREAD_STACKSIZE-4 + +#if CONFIG_ARCH_INTERRUPTSTACK > 3 +# define PIC32MX_INTSTACK_BASE PIC32MX_STACK_TOP +# define PIC32MX_INTSTACK_SIZE (CONFIG_ARCH_INTERRUPTSTACK & ~3) +# define PIC32MX_INTSTACK_TOP PIC32MX_STACK_TOP+PIC32MX_INTSTACK_SIZE +# define PIC32MX_HEAP_BASE PIC32MX_INTSTACK_TOP +#else +# define PIC32MX_HEAP_BASE PIC32MX_STACK_TOP +#endif /**************************************************************************** * Global Symbols ****************************************************************************/ .file "pic32mx-head.S" + + /* Exported symbols */ + + .globl __reset .global __start .global halt +#if CONFIG_ARCH_INTERRUPTSTACK > 3 + .global g_intstackbase + .global g_nestlevel +#endif + .global g_heapbase + + /* Imported symbols */ - .global nmi_handler - .global bev_handler - .global int_handler .global os_start + .global up_dobev + .global up_decodeirq +#ifdef CONFIG_PIC32MX_NMIHANDLER + .global up_donmi +#endif /**************************************************************************** * Name: __reset @@ -112,7 +144,6 @@ * ****************************************************************************/ - .globl __reset .section .reset, "ax", @progbits .set noreorder .ent __reset @@ -123,6 +154,52 @@ __reset: .end __reset /**************************************************************************** + * Name: _bev_exception + * + * Description: + * Boot Exception Vector Handler. Jumps to _bev_handler + * + * Input Parameters: + * None + * + * Returned Value: + * Does not return + * + ****************************************************************************/ + + .section .bev_excpt,"ax",@progbits + .set noreorder + .ent _bev_exception +_bev_exception: + la k0, _bev_handler + jr k0 + nop + .end _bev_exception + +/**************************************************************************** + * Name: _int_exception + * + * Description: + * Interrupt Exception Vector Handler. Jumps to _int_handler + * + * Input Parameters: + * None + * + * Returned Value: + * Does not return + * + ****************************************************************************/ + + .section .int_excpt,"ax",@progbits + .set noreorder + .ent _int_exception +_int_exception: + la k0, _int_handler + jr k0 + nop + .end _int_exception + +/**************************************************************************** * Name: __start * * Description: @@ -148,17 +225,19 @@ __start: * over to the NMI handler. */ +#ifdef CONFIG_PIC32MX_NMIHANDLER mfc0 k0, $12 /* Load CP0 status register */ ext k0, k0, 19, 1 /* Extract NMI bit */ beqz k0, .Lnotnmi nop - la k0, nmi_handler + la k0, _nmi_handler jr k0 nop /* This is not an NMI */ .Lnotnmi: +#endif /* Initialize the stack pointer */ @@ -331,14 +410,80 @@ __start: * necessary */ - and a0, a0, 0 - and a1, a1, 0 la t0, __start_nuttx jr t0 nop .end __start /**************************************************************************** + * Name: _bev_handler + * + * Description: + * BEV exception handler. Calls up_dobev() + * + ****************************************************************************/ + + .section .bev_handler, "ax", @progbits + .set noreorder + .ent _bev_handler +_bev_handler: + EXCPT_PROLOGUE t0 /* Save registers on stack, enable nested interrupts */ + move a0, sp /* Pass register save structure as the parameter 1 */ + USE_INTSTACK t0, t1, t2 /* Switch to the interrupt stack */ + la t0, up_dobev /* Call up_dobev(regs) */ + jalr t0, ra + di /* Disable interrupts */ + RESTORE_STACK t0, t1 /* Undo the operations of USE_STACK */ + EXCPT_EPILOGUE v0 /* Return to the context returned by up_dobev() */ + .end _bev_handler + +/**************************************************************************** + * Name: _int_handler + * + * Description: + * Interrupt exception handler. Calls up_decodeirq() + * + ****************************************************************************/ + + .section .int_handler, "ax", @progbits + .set noreorder + .ent _int_handler +_int_handler: + EXCPT_PROLOGUE t0 /* Save registers on stack, enable nested interrupts */ + move a0, sp /* Pass register save structure as the parameter 1 */ + USE_INTSTACK t0, t1, t2 /* Switch to the interrupt stack */ + la t0, up_decodeirq /* Call up_decodeirq(regs) */ + jalr t0, ra + di /* Disable interrupts */ + RESTORE_STACK t0, t1 /* Undo the operations of USE_STACK */ + EXCPT_EPILOGUE v0 /* Return to the context returned by up_decodeirq() */ + .end _int_handler + +/**************************************************************************** + * Name: _nmi_handler + * + * Description: + * NMI exception handler. Calls up_donmi + * + ****************************************************************************/ + +#ifdef CONFIG_PIC32MX_NMIHANDLER + .section .nmi_handler, "ax", @progbits + .set noreorder + .ent _nmi_handler +_nmi_handler: + EXCPT_PROLOGUE t0 /* Save registers on stack, enable nested interrupts */ + move a0, sp /* Pass register save structure as the parameter 1 */ + USE_INTSTACK t0, t1, t2 /* Switch to the interrupt stack */ + la t0, up_donmi /* Call up_donmi(regs) */ + jalr t0, ra + di /* Disable interrupts */ + RESTORE_STACK t0, t1 /* Undo the operations of USE_STACK */ + EXCPT_EPILOGUE v0 /* Return to the context returned by up_donmi() */ + .end _nmi_handler +#endif + +/**************************************************************************** * Name: __start_nuttx * * Description: @@ -356,19 +501,14 @@ __start: __start_nuttx: /* Perform low level initialization */ - jal up_lowinit + la t0, up_lowinit + jalr t0, ra nop - /* Perform early serial initialization */ - -#ifdef CONFIG_USE_EARLYSERIALINIT - jal up_earlyserialinit - nop -#endif - /* Call os_start */ - jal os_start + la t0, os_start + jalr t0, ra nop /* Just in case main returns, go into infinite loop */ @@ -379,15 +519,41 @@ halt: nop .end __start_nuttx - /* This global variable is unsigned int g_heapbase and is exported - * here only because of its coupling to idle thread stack. - */ +/**************************************************************************** + * Global Data + ****************************************************************************/ + +/* Interrupt stack variables */ + +#if CONFIG_ARCH_INTERRUPTSTACK > 3 + +/* g_instackbase is a pointer to the final, aligned word of the interrupt + * stack. + */ + + .sdata + .type g_intstackbase, object +g_intstackbase: + .long PIC32MX_INTSTACK_TOP-4 + .size g_intstackbase, .-g_intstackbase + +/* g_nextlevel is the exception nesting level... the interrupt stack is not + * available to nested exceptions. + */ + + .sbss + .type g_nestlevel, object +g_nestlevel: + .skip 4 +#endif + +/* This global variable is unsigned int g_heapbase and is exported here only + * because of its coupling to idle thread stack. + */ .sdata - .align 4 - .globl g_heapbase .type g_heapbase, object g_heapbase: - .long _ebss+CONFIG_IDLETHREAD_STACKSIZE + .long PIC32MX_HEAP_BASE .size g_heapbase, .-g_heapbase |