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