arch/arm/boot/compressed/debug.S

   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