* Implement new mechanism to export U-Boot's functions to standalone

  applications: instead of using (PPC-specific) system calls we now
  use a jump table; please see doc/README.standalone for details

* Patch by Dave Westwood, 24 Jul 2003:
  added support for Unity OS (a proprietary OS)

11 files changed, 23 insertions, 522 deletions

diff --git a/cpu/74xx_7xx/start.S b/cpu/74xx_7xx/start.S
index 7d37c8e2a9..7d7a493fea 100644
--- a/cpu/74xx_7xx/start.S
+++ b/cpu/74xx_7xx/start.S
@@ -159,75 +159,7 @@ ProgramCheck:
 	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
diff --git a/cpu/i386/interrupts.c b/cpu/i386/interrupts.c
index 84825aea19..f340119900 100644
--- a/cpu/i386/interrupts.c
+++ b/cpu/i386/interrupts.c
@@ -22,7 +22,6 @@
  */
 
 #include <common.h>
-#include <syscall.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <asm/i8259.h>
@@ -58,31 +57,6 @@ typedef struct {
 
 static irq_desc_t irq_table[MAX_IRQ];
 
-
-asm(".globl syscall_entry\n" \
-	"syscall_entry:\n" \
-	"popl   %ebx\n"        /* throw away the return address, flags  */ \
-	"popl   %ebx\n"        /* and segment that the INT instruction pushed */ \
-	"popl   %ebx\n"        /* on to the stack */ \
-	"movl   %eax, %ecx\n"  /* load the syscall nr argument*/ \
-	"movl   syscall_tbl, %eax\n" /* load start of syscall table */ \
-	"cmpl   $(11-1), %ecx\n"  /* FixMe: find a way to use NR_SYSCALLS macro here */ \
-	"ja     bad_syscall\n" \
-	"movl   (%eax, %ecx, 4), %eax\n" /* load the handler of the syscall*/ \
-	"test   %eax, %eax\n" /* test for null */ \
-	"je     bad_syscall\n" \
-	"popl   %ecx\n" \
-	"popl   %ebx\n" \
-	"sti    \n" \
-	"jmp    *%eax\n" \
-"bad_syscall: movl $0xffffffff, %eax\n" \
-	"popl   %ecx\n" \
-	"popl   %ebx\n" \
-	"ret");
-
-void __attribute__ ((regparm(0))) syscall_entry(void);
-
-
 asm ("irq_return:\n"
      "     addl  $4, %esp\n"
      "     popa\n"
@@ -483,7 +457,6 @@ int interrupt_init(void)
 	set_vector(0x2e, irq_14);
 	set_vector(0x2f, irq_15);
 	/* vectors 0x30-0x3f are reserved for irq 16-31 */
-	set_vector(0x40, syscall_entry);
 
 
 	/* Mask all interrupts */
diff --git a/cpu/mips/start.S b/cpu/mips/start.S
index 12129deed1..59c6acf91d 100644
--- a/cpu/mips/start.S
+++ b/cpu/mips/start.S
@@ -291,6 +291,11 @@ reset:
 relocate_code:
 	move	sp, a0		/* Set new stack pointer		*/
 
+	li	t0, CFG_MONITOR_BASE
+	la	t3, in_ram
+	lw	t2, -12(t3)	/* t2 <-- uboot_end_data	*/
+	move	t1, a2
+
 	/*
 	 * Fix GOT pointer:
 	 *
@@ -301,11 +306,6 @@ relocate_code:
 	add	gp, a2			/* gp now adjusted		*/
 	sub	t6, gp, t6		/* t6 <-- relocation offset	*/
 
-	li	t0, CFG_MONITOR_BASE
-	la	t3, in_ram
-	lw	t2, -12(t3)	/* t2 <-- uboot_end_data	*/
-	move	t1, a2
-
 	/*
 	 * t0 = source address
 	 * t1 = target address
diff --git a/cpu/mpc5xx/start.S b/cpu/mpc5xx/start.S
index 3b6d34495a..548ec99e2c 100644
--- a/cpu/mpc5xx/start.S
+++ b/cpu/mpc5xx/start.S
@@ -226,75 +226,7 @@ ProgramCheck:
 	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
diff --git a/cpu/mpc5xxx/start.S b/cpu/mpc5xxx/start.S
index 41454423ca..37448acba3 100644
--- a/cpu/mpc5xxx/start.S
+++ b/cpu/mpc5xxx/start.S
@@ -208,75 +208,7 @@ ProgramCheck:
 
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
diff --git a/cpu/mpc824x/drivers/i2c/i2c1.c b/cpu/mpc824x/drivers/i2c/i2c1.c
index dc1c97ca0f..94c671e567 100644
--- a/cpu/mpc824x/drivers/i2c/i2c1.c
+++ b/cpu/mpc824x/drivers/i2c/i2c1.c
@@ -1197,13 +1197,16 @@ int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
 	uchar *p;
 	int i;
 
-	p = dummy_buffer;
 	/* fill in address in big endian order */
-	for (i=0; i<alen; ++i)
-		*p++ = (addr >> (i * 8)) & 0xFF;
+	for (i=alen-1; i>=0; --i) {
+		buffer[i] = addr & 0xFF;
+		addr >>= 8;
+	}
 	/* fill in data */
+	p = dummy_buffer + alen;
+
 	for (i=0; i<len; ++i)
-		*p++ = *buffer;
+		*p++ = *buffer++;
 
 	status = I2C_do_buffer (0, I2C_MASTER_XMIT, chip, alen + len,
 				dummy_buffer, I2C_STOP, 1, I2C_NO_RESTART);
diff --git a/cpu/mpc824x/start.S b/cpu/mpc824x/start.S
index b1cdb8460d..a22137ceb6 100644
--- a/cpu/mpc824x/start.S
+++ b/cpu/mpc824x/start.S
@@ -259,74 +259,7 @@ ProgramCheck:
 	STD_EXCEPTION(EXC_OFF_DECR, Decrementer, timer_interrupt)
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 
 	STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException)
 
diff --git a/cpu/mpc8260/start.S b/cpu/mpc8260/start.S
index d3fd8652dc..a499bc1e9d 100644
--- a/cpu/mpc8260/start.S
+++ b/cpu/mpc8260/start.S
@@ -319,75 +319,7 @@ ProgramCheck:
 
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
diff --git a/cpu/mpc8xx/lcd.c b/cpu/mpc8xx/lcd.c
index c1509284b0..f2e404c4b9 100644
--- a/cpu/mpc8xx/lcd.c
+++ b/cpu/mpc8xx/lcd.c
@@ -61,9 +61,9 @@
 /* ** BITMAP DISPLAY SUPPORT  -- should probably be moved elsewhere	*/
 /************************************************************************/
 
-#if (CONFIG_COMMANDS & CFG_CMD_BMP)
+#if (CONFIG_COMMANDS & CFG_CMD_BMP) || defined(CONFIG_SPLASH_SCREEN)
 #include <bmp_layout.h>
-#endif /* (CONFIG_COMMANDS & CFG_CMD_BMP) */
+#endif /* (CONFIG_COMMANDS & CFG_CMD_BMP) || CONFIG_SPLASH_SCREEN */
 
 /************************************************************************/
 /* ** FONT AND LOGO DATA						*/
@@ -1176,7 +1176,7 @@ static void bitmap_plot (int x, int y)
 }
 #endif /* CONFIG_LCD_LOGO */
 
-#if (CONFIG_COMMANDS & CFG_CMD_BMP)
+#if (CONFIG_COMMANDS & CFG_CMD_BMP) || defined(CONFIG_SPLASH_SCREEN)
 /*
  * Display the BMP file located at address bmp_image.
  * Only uncompressed
@@ -1273,7 +1273,7 @@ int lcd_display_bitmap(ulong bmp_image)
 
 	return (0);
 }
-#endif /* (CONFIG_COMMANDS & CFG_CMD_BMP) */
+#endif /* (CONFIG_COMMANDS & CFG_CMD_BMP) || CONFIG_SPLASH_SCREEN */
 
 /*----------------------------------------------------------------------*/
 
diff --git a/cpu/mpc8xx/start.S b/cpu/mpc8xx/start.S
index 81a4dc07c9..893c0f810f 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -266,75 +266,7 @@ ProgramCheck:
 	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index aa857d030c..e3e92afa84 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -769,75 +769,7 @@ ProgramCheck:
 	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
 	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
 	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
-	. = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
-	addis	r11,r0,0		/* get functions table addr */
-	ori	r11,r11,0		/* Note: this code is patched in trap_init */
-	addis	r12,r0,0		/* get number of functions */
-	ori	r12,r12,0
-
-	cmplw	0, r0, r12
-	bge	1f
-
-	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
-	add	r11,r11,r0
-	lwz	r11,0(r11)
-
-	li	r20,0xd00-4		/* Get stack pointer */
-	lwz	r12,0(r20)
-	subi	r12,r12,12		/* Adjust stack pointer */
-	li	r0,0xc00+_end_back-SystemCall
-	cmplw	0, r0, r12		/* Check stack overflow */
-	bgt	1f
-	stw	r12,0(r20)
-
-	mflr	r0
-	stw	r0,0(r12)
-	mfspr	r0,SRR0
-	stw	r0,4(r12)
-	mfspr	r0,SRR1
-	stw	r0,8(r12)
-
-	li	r12,0xc00+_back-SystemCall
-	mtlr	r12
-	mtspr	SRR0,r11
-
-1:	SYNC
-	rfi
-
-_back:
-
-	mfmsr	r11			/* Disable interrupts */
-	li	r12,0
-	ori	r12,r12,MSR_EE
-	andc	r11,r11,r12
-	SYNC				/* Some chip revs need this... */
-	mtmsr	r11
-	SYNC
-
-	li	r12,0xd00-4		/* restore regs */
-	lwz	r12,0(r12)
-
-	lwz	r11,0(r12)
-	mtlr	r11
-	lwz	r11,4(r12)
-	mtspr	SRR0,r11
-	lwz	r11,8(r12)
-	mtspr	SRR1,r11
-
-	addi	r12,r12,12		/* Adjust stack pointer */
-	li	r20,0xd00-4
-	stw	r12,0(r20)
-
-	SYNC
-	rfi
-_end_back:
-
+	STD_EXCEPTION(0xc00, SystemCall, UnknownException)
 	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
 
 	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)