diff options
| -rw-r--r-- | src/arch/i386/core/relocate.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/arch/i386/core/relocate.c b/src/arch/i386/core/relocate.c index 39d00b098..aa58ad65c 100644 --- a/src/arch/i386/core/relocate.c +++ b/src/arch/i386/core/relocate.c @@ -93,11 +93,16 @@ __cdecl void relocate ( struct i386_all_regs *ix86 ) { /* If last byte that might be used (r_end-1) * is in an odd megabyte, round down r_end to * the top of the next even megabyte. + * + * Make sure that we don't accidentally wrap + * r_end below 0. */ - r_end = ( r_end - 1 ) & ~0xfffff; - DBG ( "...end truncated to %lx " - "(avoid ending in odd megabyte)\n", - r_end ); + if ( r_end >= 1 ) { + r_end = ( r_end - 1 ) & ~0xfffff; + DBG ( "...end truncated to %lx " + "(avoid ending in odd megabyte)\n", + r_end ); + } } else if ( ( r_end - size ) & 0x100000 ) { /* If the last byte that might be used * (r_end-1) is in an even megabyte, but the @@ -108,7 +113,7 @@ __cdecl void relocate ( struct i386_all_regs *ix86 ) { * Make sure that we don't accidentally wrap * r_end below 0. */ - if ( r_end > 0x100000 ) { + if ( r_end >= 0x100000 ) { r_end = ( r_end - 0x100000 ) & ~0xfffff; DBG ( "...end truncated to %lx " "(avoid starting in odd megabyte)\n", |