<分区>
我正在尝试在 QEMU(适用于 Cortex-A15 的 Versatile Express)上启动并运行一个小型 ARM 内核。目前它只是将 sp 设置到一个小堆栈的顶部，然后将单个字符发送到 UART0。
_start.arm:
.set stack_size, 0x10000
.comm stack, stack_size
.global _start
_start:
ldr sp, =stack+stack_size
bl start
1:
b 1b
.size _start, . - _start
开始.c:
/* UART_0 is a struct overlaid on 0x1c090000 */
void printChar(char c)
{
while (UART_0->flags & TRANSMIT_FULL);
UART_0->data = c;
}
void start()
{
while (UART_0->flags & TRANSMIT_FULL);
UART_0->data = 'A';
printChar('a');
}
从 GDB，我知道执行通过 _start 进入 start 并成功将 'A' 发送到 UART_0。 printChar 被调用并完成，但似乎没有向串行端口打印任何内容。在没有 GDB 的情况下运行时，内核重复打印 'A'，但我不确定这是处理器重置还是错误跳转。
来自 objdump:
Disassembly of section .stub:
00010000 <_start>:
10000: e59fd004 ldr sp, [pc, #4] ; 1000c <__STACK_SIZE+0xc>
10004: eb000016 bl 10064 <start>
10008: eafffffe b 10008 <_start+0x8>
1000c: 000200d0 .word 0x000200d0
Disassembly of section .text:
00010010 <printChar>:
10010: e52db004 push {fp} ; (str fp, [sp, #-4]!)
10014: e28db000 add fp, sp, #0
10018: e24dd00c sub sp, sp, #12
1001c: e1a03000 mov r3, r0
10020: e54b3005 strb r3, [fp, #-5]
10024: e1a00000 nop ; (mov r0, r0)
10028: e3a03000 mov r3, #0
1002c: e3413c09 movt r3, #7177 ; 0x1c09
10030: e1d331ba ldrh r3, [r3, #26]
10034: e6ff3073 uxth r3, r3
10038: e2033020 and r3, r3, #32
1003c: e3530000 cmp r3, #0
10040: 1afffff8 bne 10028 <printChar+0x18>
10044: e3a03000 mov r3, #0
10048: e3413c09 movt r3, #7177 ; 0x1c09
1004c: e55b2005 ldrb r2, [fp, #-5]
10050: e6ff2072 uxth r2, r2
10054: e1c320b2 strh r2, [r3, #2]
10058: e24bd000 sub sp, fp, #0
1005c: e49db004 pop {fp} ; (ldr fp, [sp], #4)
10060: e12fff1e bx lr
00010064 <start>:
10064: e52db008 str fp, [sp, #-8]!
10068: e58de004 str lr, [sp, #4]
1006c: e28db004 add fp, sp, #4
10070: e1a00000 nop ; (mov r0, r0)
10074: e3a03000 mov r3, #0
10078: e3413c09 movt r3, #7177 ; 0x1c09
1007c: e1d331ba ldrh r3, [r3, #26]
10080: e6ff3073 uxth r3, r3
10084: e2033020 and r3, r3, #32
10088: e3530000 cmp r3, #0
1008c: 1afffff8 bne 10074 <start+0x10>
10090: e3a03000 mov r3, #0
10094: e3413c09 movt r3, #7177 ; 0x1c09
10098: e5d32002 ldrb r2, [r3, #2]
1009c: e3a02000 mov r2, #0
100a0: e3822041 orr r2, r2, #65 ; 0x41
100a4: e5c32002 strb r2, [r3, #2]
100a8: e5d32003 ldrb r2, [r3, #3]
100ac: e3a02000 mov r2, #0
100b0: e5c32003 strb r2, [r3, #3]
100b4: e3a00061 mov r0, #97 ; 0x61
100b8: ebffffd4 bl 10010 <printChar>
100bc: e24bd004 sub sp, fp, #4
100c0: e59db000 ldr fp, [sp]
100c4: e28dd004 add sp, sp, #4
100c8: e49df004 pop {pc} ; (ldr pc, [sp], #4)
000100cc <UART_0>:
100cc: 1c090000 ....