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X86: Move the GDT down to where it can be accessed in 32 bit mode.

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The GDT can be accessed by user level software running in compatibility mode
by moving segment selectors into segment registers. The GDT needs to be set up
at an address accessible in this mode.
This commit is contained in:
Gabe Black 2012-05-27 19:01:08 -07:00
parent 1d96135087
commit 40084e0c3e
1 changed files with 2 additions and 2 deletions
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4
src/arch/x86/process.cc
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@ -132,7 +132,7 @@ I386LiveProcess::I386LiveProcess(LiveProcessParams *params,
int _numSyscallDescs) :
X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
{
_gdtStart = ULL(0x100000000);
_gdtStart = ULL(0xffffd000);
_gdtSize = VMPageSize;
vsyscallPage.base = 0xffffe000ULL;
@ -140,7 +140,7 @@ I386LiveProcess::I386LiveProcess(LiveProcessParams *params,
vsyscallPage.vsyscallOffset = 0x400;
vsyscallPage.vsysexitOffset = 0x410;
stack_base = vsyscallPage.base;
stack_base = _gdtStart;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);