mirror of
git://projects.qi-hardware.com/xburst-tools.git
synced 2024-11-22 23:45:20 +02:00
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
//
|
|
// Authors: Wolfgang Spraul <wolfgang@sharism.cc>
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License
|
|
// as published by the Free Software Foundation; either version
|
|
// 3 of the License, or (at your option) any later version.
|
|
//
|
|
|
|
#include "../target-common/serial.h"
|
|
#include "../target-common/common.h"
|
|
|
|
void pre_main(void)
|
|
{
|
|
volatile unsigned int start_addr, got_start, got_end, addr, offset;
|
|
|
|
/* get absolute start address */
|
|
__asm__ __volatile__(
|
|
"move %0, $20\n\t"
|
|
: "=r"(start_addr)
|
|
:
|
|
);
|
|
|
|
/* get related GOT address */
|
|
__asm__ __volatile__(
|
|
"la $4, _GLOBAL_OFFSET_TABLE_\n\t"
|
|
"move %0, $4\n\t"
|
|
"la $5, _got_end\n\t"
|
|
"move %1, $5\n\t"
|
|
: "=r"(got_start),"=r"(got_end)
|
|
:
|
|
);
|
|
|
|
/* calculate offset and correct GOT*/
|
|
offset = start_addr - 0x80000000;
|
|
got_start += offset;
|
|
got_end += offset;
|
|
|
|
for ( addr = got_start + 8; addr < got_end; addr += 4 )
|
|
*((volatile unsigned int *)(addr)) += offset; // add offset to correct all GOT
|
|
|
|
// fw_args = (struct fw_args *)(start_addr + 0x8); //get the fw args from memory
|
|
UART_BASE = 0xB0030000 + 0x1000;
|
|
serial_puts("Start address is:");
|
|
serial_put_hex(start_addr);
|
|
serial_puts("Address offset is:");
|
|
serial_put_hex(start_addr - 0x80000000);
|
|
serial_puts("GOT corrected to:");
|
|
serial_put_hex(got_start);
|
|
c_main();
|
|
}
|
|
|
|
void c_main()
|
|
{
|
|
// start infinite 'echo' kernel
|
|
while (1) {
|
|
if (serial_tstc()) {
|
|
int c = serial_getc();
|
|
serial_putc(c);
|
|
if (c == '\r')
|
|
serial_putc('\n');
|
|
}
|
|
}
|
|
}
|