sw: Move the exception message out of rodata
Per offline discussion as well as
https://spacebeaker-review.googlesource.com/c/shodan/sw/vec/+/8841/comments/e8cdd665_0d2807c6,
move the string to be embedded as immediate data.
Change-Id: Idd427a1ddf735b7b47e2aa6b265fedd9b1585379
diff --git a/springbok/crt0.S b/springbok/crt0.S
index f9e46f6..d4ce006 100644
--- a/springbok/crt0.S
+++ b/springbok/crt0.S
@@ -246,13 +246,27 @@
.weak exception_handler
exception_handler:
- li t4, 0 # ERROR logging level
- la a0, exception_msg
- csrr t5, mcause
- .word 0x001E50EFB # simprint t4, a0, t5 (encoded as custom3<func3=0>)
+ # Exception occurred
+ li t0, 0x65637845 # "Exce"
+ li t1, 0x6f697470 # "ptio"
+ li t2, 0x636f206e # "n oc"
+ li t3, 0x72727563 # "curr"
+ li t4, 0x00006465 # "ed\0\0"
+ addi sp, sp, -20
+ sw t0, 0(sp)
+ sw t1, 4(sp)
+ sw t2, 8(sp)
+ sw t3, 12(sp)
+ sw t4, 16(sp)
+ csrr a0, mcause
+ li t6, 0 # ERROR logging level
+ .word 0x00A10FFB # simprint t6, sp, a0 (encoded as custom3<func3=0>)
+ addi sp, sp, 20
+ # Store mcause as the reture value
+ mv s0, a0
call print_csrs
- # Store the return value as mcause to be used in _finish
- mv a0, t5
+ # Restore the return value to be used in _finish
+ mv a0, s0
# Clear the stack
la sp, _stack_ptr
j _finish
@@ -260,7 +274,3 @@
.weak print_csrs
print_csrs:
mret
-
-.section ".rodata","a",@progbits
-exception_msg:
- .string "Exception occurred\0"
