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Code segment may not be writable; create the temporary pointer to the GDT

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on the stack.
This commit is contained in:
Michael Brown
2006-06-06 15:30:28 +00:00
parent 46253ba618
commit e7eca7b7cb
1 changed files with 7 additions and 2 deletions
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9
src/arch/i386/prefix/libprefix.S
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@@ -254,6 +254,7 @@ flatten_real_mode:
/* Preserve real-mode segment values and temporary registers */ /* Preserve real-mode segment values and temporary registers */
pushw %es pushw %es
pushw %ds pushw %ds
pushw %bp
pushl %eax pushl %eax
/* Set GDT base and load GDT */ /* Set GDT base and load GDT */
@@ -261,8 +262,11 @@ flatten_real_mode:
movw %cs, %ax movw %cs, %ax
shll $4, %eax shll $4, %eax
addl $gdt, %eax addl $gdt, %eax
movl %eax, %cs:gdt_base pushl %eax
lgdt %cs:gdt pushw %cs:gdt_limit
movw %sp, %bp
lgdt (%bp)
addw $6, %sp
/* Switch to protected mode */ /* Switch to protected mode */
movl %cr0, %eax movl %cr0, %eax
@@ -281,6 +285,7 @@ flatten_real_mode:
/* Restore real-mode segment values and temporary registers */ /* Restore real-mode segment values and temporary registers */
popl %eax popl %eax
popw %bp
popw %ds popw %ds
popw %es popw %es
ret ret