1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #include <linux/linkage.h> |
3 | #include <asm/assembler.h> |
4 | |
5 | #ifndef CONFIG_DEBUG_SEMIHOSTING |
6 | |
7 | #include CONFIG_DEBUG_LL_INCLUDE |
8 | |
9 | ENTRY(putc) |
10 | addruart r1, r2, r3 |
11 | #ifdef CONFIG_DEBUG_UART_FLOW_CONTROL |
12 | waituartcts r3, r1 |
13 | #endif |
14 | waituarttxrdy r3, r1 |
15 | senduart r0, r1 |
16 | busyuart r3, r1 |
17 | mov pc, lr |
18 | ENDPROC(putc) |
19 | |
20 | #else |
21 | |
22 | ENTRY(putc) |
23 | adr r1, 1f |
24 | ldmia r1, {r2, r3} |
25 | add r2, r2, r1 |
26 | ldr r1, [r2, r3] |
27 | strb r0, [r1] |
28 | mov r0, #0x03 @ SYS_WRITEC |
29 | ARM( svc #0x123456 ) |
30 | #ifdef CONFIG_CPU_V7M |
31 | THUMB( bkpt #0xab ) |
32 | #else |
33 | THUMB( svc #0xab ) |
34 | #endif |
35 | mov pc, lr |
36 | .align 2 |
37 | 1: .word _GLOBAL_OFFSET_TABLE_ - . |
38 | .word semi_writec_buf(GOT) |
39 | ENDPROC(putc) |
40 | |
41 | .bss |
42 | .global semi_writec_buf |
43 | .type semi_writec_buf, %object |
44 | semi_writec_buf: |
45 | .space 4 |
46 | .size semi_writec_buf, 4 |
47 | |
48 | #endif |
49 | |