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provide an early exception vector table to catch exceptions during startup, before the final table has been set up (in exceptions.S)

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This commit is contained in:
Markus Fröschle
2013-08-02 09:35:57 +00:00
parent 24f04538f6
commit 86d40efd50
5 changed files with 63 additions and 3 deletions
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1
BaS_gcc/Makefile
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@@ -61,6 +61,7 @@ BASFLASH_EXEC=basflash.$(EXE)
CSRCS= \
$(SRCDIR)/sysinit.c \
$(SRCDIR)/init_fpga.c \
$(SRCDIR)/fault_vectors.c \
$(SRCDIR)/bas_printf.c \
$(SRCDIR)/bas_string.c \
$(SRCDIR)/BaS.c \

2
BaS_gcc/bas.lk.in
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@@ -11,6 +11,7 @@ SECTIONS
{
objs/startcf.o(.text) /* this one is the entry point so it must be the first */
objs/sysinit.o(.text)
objs/fault_vectors.o(.text)
objs/init_fpga.o(.text)
objs/wait.o(.text)
@@ -70,6 +71,7 @@ SECTIONS
/* SDRAM Initialization @ 0000_0000 - 1FFF_FFFF 512Mbytes */
___SDRAM = 0x00000000;
___SDRAM_SIZE = 0x20000000;
_SDRAM_VECTOR_TABLE = ___SDRAM;
/* ST-RAM */
__STRAM = ___SDRAM;

8
BaS_gcc/include/mmu.h
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@@ -16,6 +16,14 @@
#define COPYBACK_MMUDR (MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(01) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
#define NOCACHE_PRECISE_MMUDR (MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(10) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
#define SCA_PAGE_ID 6
/*
* global variables from linker script
*/
extern long video_tlb;
extern long video_sbt;
extern void mmu_init(void);
extern void mmutr_miss(void) __attribute__((interrupt));

49
BaS_gcc/sources/fault_vectors.c Normal file
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@@ -0,0 +1,49 @@
#include "MCF5475.h"
#include "bas_types.h"
#include "bas_printf.h"
/*
* provide an early exception vector branch table to catch exceptions _before_ VBR has been setup eventually
* (to RAMBAR0, in exceptions.S)
*/
typedef void (*exception_handler)(void);
extern exception_handler SDRAM_VECTOR_TABLE[];
void fault_handler(uint32_t format_status, uint32_t pc)
{
xprintf("\007\007exception!\r\n");
xprintf("format_status: %lx\r\n", format_status);
xprintf("pc: %lx\r\n", pc);
xprintf("processor halted.\r\n");
}
void handler(void)
{
/*
* for standard routines, we'd have to save registers here.
* Since we do not intend to return anyway, we just ignore that
*/
__asm__ __volatile__("move.l (sp),-(sp)\n\t" /* format, fault status and status register values */
"move.l 8(sp),-(sp)\n\t" /* the program counter where the fault originated */
"bra _fault_handler\n\t"
"halt\n\t"
: : :);
}
void setup_vectors(void)
{
int i;
for (i = 0; i < 256; i++)
{
SDRAM_VECTOR_TABLE[i] = handler;
}
/*
* make sure VBR points to our table
*/
__asm__ __volatile__("clr.l d0\n\t"
"movec d0,VBR\n\t"
"move.l d0,_rt_vbr");
}

4
BaS_gcc/sources/mmu.c
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@@ -68,10 +68,10 @@ void mmu_init(void)
* 0x00d00000 locked ID=6
* video RAM: read write execute normal write true
*/
MCF_MMU_MMUTR = 0x00d00000 | MCF_MMU_MMUTR_ID(sca_page_ID) | STD_MMUTR;
MCF_MMU_MMUTR = 0x00d00000 | MCF_MMU_MMUTR_ID(SCA_PAGE_ID) | STD_MMUTR;
MCF_MMU_MMUDR = 0x60d00000 | WRITETHROUGH_MMUDR | MCF_MMU_MMUDR_LK;
MCF_MMU_MMUOR = MMUORD_D;
MCF_MMU_MMUOR = 0x00d00000 | std_mmutr;
MCF_MMU_MMUOR = 0x00d00000 | STD_MMUTR;
video_tlb = 0x2000;
video_sbt = 0;