120 lines
4 KiB
C
120 lines
4 KiB
C
/***************************************************************************
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* ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
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*
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* This program is PUBLIC DOMAIN.
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* This means that there is no copyright and anyone is able to take a copy
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* for free and use it as they wish, with or without modifications, and in
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* any context, commercially or otherwise. The only limitation is that I
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* don't guarantee that the software is fit for any purpose or accept any
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* liability for it's use or misuse - this software is without warranty.
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***************************************************************************
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* File Description: Unwinder client that reads local memory.
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* This client reads from local memory and is designed to run on target
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* along with the unwinder. Memory read requests are implemented by
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* casting a point to read the memory directly, although checks for
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* alignment should probably also be made if this is to be used in
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* production code, as otherwise the ARM may return the memory in a
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* rotated/rolled format, or the MMU may generate an alignment exception
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* if present and so configured.
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**************************************************************************/
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/***************************************************************************
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* Includes
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***************************************************************************/
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#include "backtrace.h"
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#include "safe_read.h"
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/***************************************************************************
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* Prototypes
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***************************************************************************/
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static Boolean CliReport(void *data, Int32 address);
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static Boolean CliReadW(Int32 a, Int32 *v);
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static Boolean CliReadH(Int32 a, Int16 *v);
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static Boolean CliReadB(Int32 a, Int8 *v);
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/***************************************************************************
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* Variables
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***************************************************************************/
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/* Table of function pointers for passing to the unwinder */
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const UnwindCallbacks cliCallbacks =
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{
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CliReport,
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CliReadW,
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CliReadH,
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CliReadB
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#if defined(UNW_DEBUG)
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,printf
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#endif
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};
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/***************************************************************************
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* Callbacks
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***************************************************************************/
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/***************************************************************************
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*
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* Function: CliReport
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*
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* Parameters: data - Pointer to data passed to UnwindStart()
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* address - The return address of a stack frame.
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*
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* Returns: TRUE if unwinding should continue, otherwise FALSE to
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* indicate that unwinding should stop.
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*
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* Description: This function is called from the unwinder each time a stack
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* frame has been unwound. The LSB of address indicates if
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* the processor is in ARM mode (LSB clear) or Thumb (LSB
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* set).
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*
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***************************************************************************/
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static Boolean CliReport(void *data, Int32 address)
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{
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/* CliStack *s = (CliStack *)data; */
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unsigned *line = (unsigned *)data;
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lcd_putsf(0, (*line)++, " %c: %08x",
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(address & 0x1) ? 'T' : 'A',
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address & (~0x1));
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lcd_update();
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return TRUE;
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}
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static Boolean CliReadW(const Int32 a, Int32 *v)
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{
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return safe_read32((uint32_t *)a, (uint32_t *)v);
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}
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static Boolean CliReadH(const Int32 a, Int16 *v)
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{
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return safe_read16((void *)a, (uint16_t *)v);
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}
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static Boolean CliReadB(const Int32 a, Int8 *v)
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{
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return safe_read8((void *)a, (uint8_t *)v);
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}
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Boolean CliInvalidateW(const Int32 a)
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{
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*(Int32 *)a = 0xdeadbeef;
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return TRUE;
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}
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void backtrace(int pcAddr, int spAddr, unsigned *line)
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{
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lcd_putsf(0, (*line)++, "pc:%08x sp:%08x", pcAddr, spAddr);
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lcd_update();
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UnwindStart(pcAddr, spAddr, &cliCallbacks, (void *)line);
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lcd_puts(0, (*line)++, "bt end");
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lcd_update();
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}
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/* END OF FILE */
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