From 308f21dc68ca1387c7003e9d185b717af7d575bf Mon Sep 17 00:00:00 2001
From: Rafaël Carré <rafael.carre@gmail.com>
Date: Sun, 9 Nov 2008 06:17:16 +0000
Subject: ARM C Runtime : prepare to exception vectors if not in the bootloader

For example if running from SDRAM, we need to copy the vectors to offset 0

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19044 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/crt0.S | 49 ++++++++++++++++++++++++++++++++++------------
 1 file changed, 37 insertions(+), 12 deletions(-)

(limited to 'firmware/target/arm')

diff --git a/firmware/target/arm/crt0.S b/firmware/target/arm/crt0.S
index 3bd061a17a..829004193f 100644
--- a/firmware/target/arm/crt0.S
+++ b/firmware/target/arm/crt0.S
@@ -26,20 +26,48 @@
     .global    start
 start:
     /* Exception vectors */
-    b       newstart
-    b       undef_instr_handler
-    b       software_int_handler
-    b       prefetch_abort_handler
-    b       data_abort_handler
-    b       reserved_handler
-    b       irq_handler
-    b       fiq_handler
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+    ldr     pc, [pc, #28]
+
 #if CONFIG_CPU==S5L8700
     .word 0x43554644 /* DFUC */
+#else
+    .word 0xdeadbeef /* to keep the same PC offsets */
 #endif
+
+.word newstart
+.word undef_instr_handler
+.word software_int_handler
+.word prefetch_abort_handler
+.word data_abort_handler
+.word reserved_handler
+.word irq_handler
+.word fiq_handler
+
+vectors_end:
+
+    .text
+
 newstart:
     msr     cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ/FIQ */
-     
+
+#if CONFIG_CPU==AS3525 && !defined(BOOTLOADER) /* relocate vectors */
+    mov     r1, #0              @ destination
+    ldr     r2, =start          @ source
+    ldr     r3, =vectors_end    @ end
+
+1:  ldr     r0, [r2], #4
+    str     r0, [r1], #4
+    cmp     r3, r2
+    bne     1b
+#endif
+
     /* Initialise bss section to zero */
     ldr     r2, =_edata
     ldr     r3, =_end
@@ -77,9 +105,6 @@ newstart:
     bl      main
 
 
-    .text
-/*    .global UIE*/
-
 /* All illegal exceptions call into UIE with exception address as first
  * parameter. This is calculated differently depending on which exception
  * we're in. Second parameter is exception number, used for a string lookup
-- 
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