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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>
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Panic handling, including displaying a message on the panic reporting
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* device, which is currently the UART.
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*/
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#ifndef __PANIC_H
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#include <stdarg.h>
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/**
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* Write a character to the panic reporting device
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*
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* This function will not return until the character has left the UART
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* data register. Any previously queued UART traffic is displayed first.
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*
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* @param ch Character to write
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*/
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void panic_putc(int ch);
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/**
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* Write a string to the panic reporting device
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*
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* This function will not return until the string has left the UART
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* data register. Any previously queued UART traffic is displayed first.
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*
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* @param ch Character to write
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*/
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void panic_puts(const char *s);
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/**
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* Very basic vprintf() for use in panic situations
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*
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* We only support %s and %nx where n is the number of hex digits to display.
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* Currently we don't even support %d, and it is aimed at small code size.
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*
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* TODO(sjg@chromium.org): Really what we need is a vsnprintf() that is
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* shared between the console UART and panic (and is also available as an
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* snprintf()). The only downside is that we would then require a large
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* printf() implementation to be always present, whereas presumably now we
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* can turn it off.
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*
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* @param format printf-style format string
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* @param args List of arguments to process
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*/
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void panic_vprintf(const char *format, va_list args);
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/**
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* Very basic printf() for use in panic situations
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*
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* See panic_vprintf() for full details
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*
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* @param format printf-style format string
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* @param ... Arguments to process
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*/
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void panic_printf(const char *format, ...);
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/**
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* Report a panic to the panic reporting device
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*
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* This is exported only to permit use from assembler.
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*
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* @param msg Panic message
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* @param lregs Registers from the exception: psp, ipsr, lr, r4-r11
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*/
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void report_panic(const char *msg, uint32_t *lregs);
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#endif
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