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authorIgor Guryanov <guryanov@synopsys.com>2014-12-24 17:17:11 +0300
committerAlexey Brodkin <abrodkin@synopsys.com>2015-01-15 22:38:42 +0300
commit20a58ac0d8e09d0bf1a74c6b68fea22784512b51 (patch)
treedf909ca56ce3685deec112fdda3e723e77c09262 /arch/arc/cpu/arc700/start.S
parentdcb431e723f132d0df63fb1e711042a6bbfc3a6a (diff)
arc: introduce separate section for interrupt vector table
Even though existing implementation works fine in preparation to submission of ARCv2 architecture we need this change. In case of ARCv2 interrupt vector table consists of just addresses of corresponding handlers. And if those addresses will be in .text section then assembler will encode them as everything in .text section as middle-endian and then on real execution CPU will read swapped addresses and will jump into the wild. Once introduced new section is situated so .text section remains the first which allows us to use common linker option for linking everything to a specified CONFIG_SYS_TEXT_BASE. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Igor Guryanov <guryanov@synopsys.com>
Diffstat (limited to 'arch/arc/cpu/arc700/start.S')
-rw-r--r--arch/arc/cpu/arc700/start.S49
1 files changed, 25 insertions, 24 deletions
diff --git a/arch/arc/cpu/arc700/start.S b/arch/arc/cpu/arc700/start.S
index 2318282bf4..01cfba4933 100644
--- a/arch/arc/cpu/arc700/start.S
+++ b/arch/arc/cpu/arc700/start.S
@@ -88,11 +88,11 @@
#endif
.endm
+.section .ivt, "ax",@progbits
.align 4
-.globl _start
-_start:
+_ivt:
/* Critical system events */
- j reset /* 0 - 0x000 */
+ j _start /* 0 - 0x000 */
j memory_error /* 1 - 0x008 */
j instruction_error /* 2 - 0x010 */
@@ -110,6 +110,28 @@ _start:
j EV_Trap /* 0x128, Trap exception (0x25) */
j EV_Extension /* 0x130, Extn Intruction Excp (0x26) */
+.text
+.globl _start
+_start:
+ /* Setup interrupt vector base that matches "__text_start" */
+ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
+
+ /* Setup stack pointer */
+ mov %sp, CONFIG_SYS_INIT_SP_ADDR
+ mov %fp, %sp
+
+ /* Clear bss */
+ mov %r0, __bss_start
+ mov %r1, __bss_end
+
+clear_bss:
+ st.ab 0, [%r0, 4]
+ brlt %r0, %r1, clear_bss
+
+ /* Zero the one and only argument of "board_init_f" */
+ mov_s %r0, 0
+ j board_init_f
+
memory_error:
SAVE_ALL_SYS
SAVE_EXCEPTION_SOURCE
@@ -164,27 +186,6 @@ EV_Extension:
mov %r0, %sp
j do_extension
-
-reset:
- /* Setup interrupt vector base that matches "__text_start" */
- sr __text_start, [ARC_AUX_INTR_VEC_BASE]
-
- /* Setup stack pointer */
- mov %sp, CONFIG_SYS_INIT_SP_ADDR
- mov %fp, %sp
-
- /* Clear bss */
- mov %r0, __bss_start
- mov %r1, __bss_end
-
-clear_bss:
- st.ab 0, [%r0, 4]
- brlt %r0, %r1, clear_bss
-
- /* Zero the one and only argument of "board_init_f" */
- mov_s %r0, 0
- j board_init_f
-
/*
* void relocate_code (addr_sp, gd, addr_moni)
*