From 9b5a146a43db3733c731d47022f4f5259e6b31e6 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Wed, 22 Feb 2012 21:58:03 +0100 Subject: ARM: 7338/1: add support for early console output via semihosting This is a very simple method for code running in an emulator, or under the supervision of a debugger, to use I/O facilities on the controlling host. Tested with OpenOCD, and ARM's Fast Models. Details on semihosting can be found in chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/kernel/debug.S | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) (limited to 'arch/arm/kernel/debug.S') diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S index 204e2160cfcc..e5a765c5f06a 100644 --- a/arch/arm/kernel/debug.S +++ b/arch/arm/kernel/debug.S @@ -100,7 +100,7 @@ #endif /* CONFIG_CPU_V6 */ -#else +#elif !defined(CONFIG_DEBUG_SEMIHOSTING) #include #endif /* CONFIG_DEBUG_ICEDCC */ @@ -155,6 +155,8 @@ hexbuf: .space 16 .ltorg +#ifndef CONFIG_DEBUG_SEMIHOSTING + ENTRY(printascii) addruart_current r3, r1, r2 b 2f @@ -177,3 +179,24 @@ ENTRY(printch) mov r0, #0 b 1b ENDPROC(printch) + +#else + +ENTRY(printascii) + mov r1, r0 + mov r0, #0x04 @ SYS_WRITE0 + ARM( svc #0x123456 ) + THUMB( svc #0xab ) + mov pc, lr +ENDPROC(printascii) + +ENTRY(printch) + adr r1, hexbuf + strb r0, [r1] + mov r0, #0x03 @ SYS_WRITEC + ARM( svc #0x123456 ) + THUMB( svc #0xab ) + mov pc, lr +ENDPROC(printch) + +#endif -- cgit v1.2.3-70-g09d2