2006-02-07 Paul Brook <paul@codesourcery.com>

* libc/machine/arm/setjmp.S: Add Thumb-2 support.
        * libc/sys/arm/crt0.S: Add Thumb-2 startup code.
        * libc/sys/arm/libcfunc.c (do_AngelSWI): Use AngelSWIInsn.
        * libc/sys/arm/swi.h (AngelSWIInsn, AngelSWIAsm): Define.
        * libc/sys/arm/trap.S: Disable for Thumb-2.

newlib/libc/sys/arm/crt0.S

@@ -18,15 +18,26 @@
 
 /* .text is used instead of .section .text so it works with arm-aout too.  */
 	.text
+#if defined(__thumb2__)
+	.syntax unified
+	.thumb
+.macro FUNC_START name
+	.global	\name
+	.thumb_func
+\name:
+.endm	
+#else
 	.code 32
+.macro FUNC_START name
+	.global	\name
+\name:
+.endm	
+#endif
 	.align 	0
 
-	.global	_mainCRTStartup
-	.global	_start
-	.global	start
-start:
-_start:
-_mainCRTStartup:
+	FUNC_START	_mainCRTStartup
+	FUNC_START	_start
+	FUNC_START	start
 #if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__)
 	/* Annotation for EABI unwinding tables.  */
 	.fnstart
@@ -45,7 +56,12 @@ _mainCRTStartup:
 	/*  Issue Angel SWI to read stack info */
 	mov	r0, #AngelSWI_Reason_HeapInfo
 	adr	r1, .LC0	/*  point at ptr to 4 words to receive data */
-	swi	AngelSWI_ARM	/*  We are always in ARM mode for startup */
+#if defined(__thumb2__)
+	bkpt	AngelSWI
+#else
+	/*  We are always in ARM mode for startup */
+	AngelSWIAsm	AngelSWI_ARM
+#endif
 	ldr	r0, .LC0	/*  point at values read */
 	ldr	sp, [r0, #8]
 	ldr	sl, [r0, #12]
@@ -75,8 +91,8 @@ _mainCRTStartup:
 	sub	a3, a3, a1		/* Third arg: length of block */
 	
 
-#ifdef __thumb__		/* Enter Thumb mode.... */
-
+#if defined(__thumb__) && !defined(__thumb2__)
+	/* Enter Thumb mode.... */
 	add	a4, pc, #1	/* Get the address of the Thumb block */
 	bx	a4		/* Go there and start Thumb decoding  */
 
@@ -100,7 +116,7 @@ __change_mode:
 #else
 	mov	r0, #AngelSWI_Reason_GetCmdLine
 	adr	r1, .LC30	/*  Space for command line */
-	swi	AngelSWI
+	AngelSWIAsm	AngelSWI
 	ldr	r1, .LC30
 #endif
 	/*  Parse string at r1 */
@@ -222,7 +238,7 @@ __change_mode:
 
 	bl	FUNCTION (exit)		/* Should not return.  */
 
-#ifdef __thumb__
+#if defined(__thumb__) && !defined(__thumb2__)
 	/* Come out of Thumb mode.  This code should be redundant.  */
 
 	mov	a4, pc

newlib/libc/sys/arm/libcfunc.c

@@ -13,7 +13,7 @@ static inline int
 do_AngelSWI (int reason, void * arg)
 {
   int value;
-  asm volatile ("mov r0, %1; mov r1, %2; swi %a3; mov %0, r0"
+  asm volatile ("mov r0, %1; mov r1, %2; " AngelSWIInsn " %a3; mov %0, r0"
        : "=r" (value) /* Outputs */
        : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
        : "r0", "r1", "lr"

newlib/libc/sys/arm/swi.h

@@ -33,6 +33,14 @@
 #else
 #define AngelSWI 			AngelSWI_ARM
 #endif
+/* For Thumb-2 code use the BKPT instruction instead of SWI.  */
+#ifdef __thumb2__
+#define AngelSWIInsn			"bkpt"
+#define AngelSWIAsm			bkpt
+#else
+#define AngelSWIInsn			"swi"
+#define AngelSWIAsm			swi
+#endif
 
 /* The reason codes:  */
 #define AngelSWI_Reason_Open		0x01

newlib/libc/sys/arm/syscalls.c

@@ -98,7 +98,7 @@ static inline int
 do_AngelSWI (int reason, void * arg)
 {
   int value;
-  asm volatile ("mov r0, %1; mov r1, %2; swi %a3; mov %0, r0"
+  asm volatile ("mov r0, %1; mov r1, %2; " AngelSWIInsn " %a3; mov %0, r0"
        : "=r" (value) /* Outputs */
        : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
        : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"

newlib/libc/sys/arm/trap.S

@@ -1,4 +1,5 @@
         /* Run-time exception support */
+#if !defined(__thumb2__)
 #include "swi.h"
 
 /* .text is used instead of .section .text so it works with arm-aout too.  */
@@ -91,3 +92,4 @@ __rt_stkovf_split_big:
         @ We now know how much extra stack the function requires.
         @ Terminate the program for the moment:
         swi     SWI_Exit
+#endif