| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 11 | #ifdef CONFIG_DEBUG_UART_FLOW_CONTROL |
| 12 | waituartcts r3, r1 |
| 13 | #endif |
| 14 | waituarttxrdy r3, r1 |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |