projects/linux·blob master · refs

48 lines · 801 B

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
9ENTRY(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
18ENDPROC(putc)
19
20#else
21
22ENTRY(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
371: .word _GLOBAL_OFFSET_TABLE_ - .
38 .word semi_writec_buf(GOT)
39ENDPROC(putc)
40
41 .bss
42 .global semi_writec_buf
43 .type semi_writec_buf, %object
44semi_writec_buf:
45 .space 4
46 .size semi_writec_buf, 4
47
48#endif