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3439e70a90
Move the implementation of panic into C code. Only a very small part
needs to be in assembler, and the reset is easier to maintain as C.
As part of this, define panic_putc() and panic_puts() which directly
wite to the UART.
To make things more convenience for the future, add a simple printf()
implementation in the panic path. This is not reliant on the uart
buffering system being in a happy state. However, we do call the
emergency flush so that our panic message will appear after previous
output rather that surpressing it (which would be extremely confusing).
Code/data size for panic.o grows by about 200 bytes, but this is mostly
due to the increased flexibility.
text data bss dec hex filename
292 272 0 564 234 old panic.S
692 3 48 743 2e7 new panic.c
BUG=chrome-os-partner:10146
TEST=manual:
build and boot on snow:
> rw 0x06000000
=== EXCEPTION: 03 ====== xPSR: 01000000 ===========
r0 :0000000b r1 :00000047 r2 :06000000 r3 :200013dd
r4 :00000000 r5 :080052cc r6 :200013d0 r7 :00000002
r8 :00000000 r9 :200013de r10:00000000 r11:00000000
r12:00000000 sp :200009a0 lr :08002a5d pc :08003962
Rebooting...
Change-Id: If3e3f572e0f32af780b6ebda235b1b3cde4de5e4
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/24503
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>