[参考译文] TMS570LC4357：在早期初始化代码中使用调试器

ldr pc, =z_arm_reset             /*                   offset 0 */
ldr pc, =z_arm_undef_instruction /* undef instruction offset 4 */
ldr pc, =z_arm_svc               /* svc               offset 8 */
ldr pc, =z_arm_prefetch_abort    /* prefetch abort offset  0xc */
ldr pc, =z_arm_data_abort        /* data abort     offset 0x10 */


...
...
...

z_arm_reset:

    mov r0,  #0
    mov r1,  #0
    mov r2,  #0
    mov r3,  #0
    mov r4,  #0
    mov r5,  #0
    mov r6,  #0
    mov r7,  #0
    mov r8,  #0
    mov r9,  #0
    mov r10, #0
    mov r11, #0
    mov r12, #0
    mov r13, #0
    mov r14, #0
    mrs r0,  cpsr
    msr spsr_cxsf, r0

    /* FIQ mode registers */
    cps #MODE_FIQ
    mov r8,  #0         /* r8_fiq */
    mov r9,  #0         /* r9_fiq */
    mov r10, #0         /* r10_fiq */
    mov r11, #0         /* r11_fiq */
    mov r12, #0         /* r12_fiq */
    mov r13, #0         /* r13_fiq */
    mov r14, #0         /* r14_fiq */
    mrs r0,  cpsr
    msr spsr_cxsf, r0   /* spsr_fiq */

    /* IRQ mode registers */
    cps #MODE_IRQ
    mov r13, #0         /* r13_irq */
    mov r14, #0         /* r14_irq */
    mrs r0,  cpsr
    msr spsr_cxsf, r0   /* spsr_irq */

    /* ABT mode registers */
    cps #MODE_ABT
    mov r13, #0         /* r13_abt */
    mov r14, #0         /* r14_abt */
    mrs r0,  cpsr
    msr spsr_cxsf, r0   /* spsr_abt */

...
...

IFSR = 0x00000000
IFAR = 0x00000000

DFSR = 0x00000001
DFAR = 0x18F09FE5


It seems like DFSR was already set to 1 even before reaching this address. Also, the value in DFAR seems to be the memory contents of the first few dwords in the code, the vector table:

 0000 18f09fe5 18f09fe5 18f09fe5 18f09fe5  ................
 0010 18f09fe5 00f020e3 14f09fe5 14f09fe5  ...... .........
 0020 00000148 00000098 000002e8 000000dc  ...H............
 0030 0000010c 00001429 0000007d           .......)...}