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