121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
#include <fxos.h>
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#include <errors.h>
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#include <stdio.h>
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#include <string.h>
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#include <endianness.h>
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char const *info_str =
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"Header information:\n"
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" Bootcode timestamp (DateA) (0x8000ffb0) : %s\n"
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" Serial number (0x8000ffd0) : %s\n"
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" Bootcode checksum (0x8000fffc) : 0x%s\n"
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" OS version (0x80010020) : %s\n";
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char const *footer_str =
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"\nFooter information:\n"
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" Detected footer address : 0x8%07x\n"
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" Langdata entries found : %d\n"
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" OS date (DateO) (0x8%07x)" " : %s\n"
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" OS checksum (0x8%07x)" " : 0x%s\n";
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char const *syscall_str =
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"\nSyscall information:\n"
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" Syscall table address (0x8001007c) : 0x%08x\n"
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" Entries that point to valid memory : 0x%x\n"
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" First seemingly invalid entry : 0x%08x\n"
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" Syscall entries outside ROM:\n";
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char const *syscall_nonrom_str =
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" %%%04x -> 0x%08x (%s memory)\n";
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/* extract_str(): Extract a string from the OS file
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This function checks offsets and bounds and writes "(eof)" if the provided
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file is too small for the tested offset. */
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static void extract_str(struct os const * os, uint32_t address, size_t size,
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char *dst)
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{
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if(address + size > os->len)
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{
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strcpy(dst, "(eof)");
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return;
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}
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memcpy(dst, os->data + address, size);
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dst[size] = 0;
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}
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/* extract_int(): Extract a string from the OS file */
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static void extract_int(struct os const *os, uint32_t address, char *dst)
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{
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if(address + 4 > os->len)
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{
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strcpy(dst, "(eof)");
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return;
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}
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uint32_t x;
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memcpy(&x, os->data + address, 4);
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x = be32toh(x);
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sprintf(dst, "%08x", x);
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}
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/* info_os(): Print general information on an OS file */
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void info_os(struct os const *os)
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{
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void *data = os->data;
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size_t len = os->len;
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char bios_timestamp[15];
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extract_str(os, 0xffb0, 14, bios_timestamp);
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char serial[9];
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extract_str(os, 0xffd0, 8, serial);
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char bios_checksum[9];
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extract_int(os, 0xfffc, bios_checksum);
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printf(info_str, bios_timestamp, serial, bios_checksum, os->version);
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if(os->footer == (uint32_t)-1)
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{
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printf("\nFooter could not be found.\n");
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}
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else
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{
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uint32_t addr = os->footer + 8;
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int langdata = 0;
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while(addr + 8 < len && !memcmp(data + addr, "Langdata", 8))
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{
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langdata++;
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addr += 0x30;
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}
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char os_timestamp[15];
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extract_str(os, addr, 14, os_timestamp);
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char os_checksum[9];
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extract_int(os, addr + 0x18, os_checksum);
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printf(footer_str, os->footer, langdata, addr, os_timestamp,
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addr + 0x18, os_checksum);
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}
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printf(syscall_str, os->syscall_table, os->syscalls,
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os_syscall(os, os->syscalls));
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int total = 0;
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for(int i = 0; i < os->syscalls; i++)
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{
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uint32_t e = os_syscall(os, i);
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struct region const *r = memory_region(e);
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if(!r || !strcmp(r->name, "ROM")) continue;
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printf(syscall_nonrom_str, i, e, r->name);
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total++;
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}
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if(!total) printf(" (none)\n");
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}
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