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68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
//
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// Authors: Wolfgang Spraul <wolfgang@sharism.cc>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version
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// 3 of the License, or (at your option) any later version.
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//
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#include <inttypes.h>
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#include "../target-common/jz4740.h"
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#include "../target-common/serial.h"
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void c_main();
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void pre_main(void)
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{
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volatile unsigned int start_addr, got_start, got_end, addr, offset;
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/* get absolute start address */
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__asm__ __volatile__(
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"move %0, $20\n\t"
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: "=r"(start_addr)
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:
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);
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/* get related GOT address */
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__asm__ __volatile__(
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"la $4, _GLOBAL_OFFSET_TABLE_\n\t"
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"move %0, $4\n\t"
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"la $5, _got_end\n\t"
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"move %1, $5\n\t"
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: "=r"(got_start),"=r"(got_end)
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:
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);
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/* calculate offset and correct GOT*/
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offset = start_addr - 0x80000000;
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got_start += offset;
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got_end += offset;
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for ( addr = got_start + 8; addr < got_end; addr += 4 )
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*((volatile unsigned int *)(addr)) += offset; // add offset to correct all GOT
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// fw_args = (struct fw_args *)(start_addr + 0x8); //get the fw args from memory
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UART_BASE = 0xB0030000;
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serial_puts("Start address is:");
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serial_put_hex(start_addr);
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serial_puts("Address offset is:");
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serial_put_hex(start_addr - 0x80000000);
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serial_puts("GOT corrected to:");
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serial_put_hex(got_start);
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c_main();
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}
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void c_main()
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{
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// start infinite 'echo' kernel
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while (1) {
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if (serial_tstc()) {
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int c = serial_getc();
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serial_putc(c);
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if (c == '\r')
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serial_putc('\n');
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}
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}
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}
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