debug.c

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#include <stdlib.h>
#include <debug.h>
#include <ppc/register.h>
#include <ppc/xenonsprs.h>
 
void buffer_dump(void * buf, int size){
    int i;
    char* cbuf=(char*) buf;
 
    printf("[Buffer dump] at %p, size=%d\n",buf,size);
    
    while(size>0){
        for(i=0;i<16;++i){
            printf("%02x ",*cbuf);
            ++cbuf;
        }
        printf("\n");
        size-=16;
    }
}
 
extern unsigned char elfldr_start[]; // also end of .text ...
 
static int seems_valid(unsigned int p){
    return p>=0x80000000 && p<(unsigned int)elfldr_start;
}
 
#define DO_RA(x) if(seems_valid(addr) && x<max_depth){ addr=(unsigned int)__builtin_return_address(x); printf("%p; ",addr); }
 
void stack_trace(int max_depth)
{
    unsigned int addr=0x80000000;
    
    printf("[Stack trace] ");
    
    DO_RA(0);
    DO_RA(1);
    DO_RA(2);
    DO_RA(3);
    DO_RA(4);
    DO_RA(5);
    DO_RA(6);
    DO_RA(7);
    DO_RA(8);
    DO_RA(9);
    DO_RA(10);
    DO_RA(11);
    DO_RA(12);
    DO_RA(13);
    DO_RA(14);
    DO_RA(15);
    
    printf("\n");
}
 
void data_breakpoint(void * address, int on_read, int on_write)
{
    if (on_read || on_write)
        mtspr(dabrx,6);
    else
        mtspr(dabrx,0);
    
    unsigned int db=((unsigned int)address)&~7;
    
    db|=4; // virtual address
    
    if (on_read)
        db|=1;
    
    if (on_write)
        db|=2;
    
    mtspr(dabr,db);
}