arch/arm/boot/compressed/debug.S

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