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11829:cb5390385d87 |
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10-Feb-2017 |
Jason Lowe-Power <jason@lowepower.com> |
x86: Fix implicit stack addressing in 64-bit mode
When in 64-bit mode, if the stack is accessed implicitly by an instruction
the alternate address prefix should be ignored if present.
This patch adds an extra flag to the ldstop which signifies when the
address override should be ignored. Then, for all of the affected
instructions, this patch adds two options to the ld and st opcode to use
the current stack addressing mode for all addresses and to ignore the
AddressSizeFlagBit. Finally, this patch updates the x86 TLB to not
truncate the address if it is in 64-bit mode and the IgnoreAddrSizeFlagBit
is set.
This fixes a problem when calling __libc_start_main with a binary that is
linked with a recent version of ld. This version of ld uses the address
override prefix (0x67) on the call instruction instead of a nop.
Note: This has not been tested in compatibility mode and only the call
instruction with the address override prefix has been tested.
See [1] page 9 (pdf page 45)
For instructions that are affected see [1] page 519 (pdf page 555).
[1] http://support.amd.com/TechDocs/24594.pdf
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
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| #
9700:2ea56473f400 |
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21-May-2013 |
Nilay Vaish <nilay@cs.wisc.edu> |
x86: mark instructions for being function call/return
Currently call and return instructions are marked as IsCall and IsReturn. Thus, the
branch predictor does not use RAS for these instructions. Similarly, the number of
function calls that took place is recorded as 0. This patch marks these instructions
as they should be.
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| #
7872:b21a94bf6a28 |
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02-Feb-2011 |
Gabe Black <gblack@eecs.umich.edu> |
X86: Replace the stupd microop with a store/update sequence.
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| #
7087:fb8d5786ff30 |
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24-May-2010 |
Nathan Binkert <nate@binkert.org> |
copyright: Change HP copyright on x86 code to be more friendly
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| #
5543:3af77710f397 |
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10-Sep-2008 |
Ali Saidi <saidi@eecs.umich.edu> |
style: Remove non-leading tabs everywhere they shouldn't be. Developers should configure their editors to not insert tabs
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| #
5176:43fb805e1b85 |
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21-Oct-2007 |
Gabe Black <gblack@eecs.umich.edu> |
X86: Start using the stupd microop, and update statistics accordingly.
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| #
5119:a4469f2919f3 |
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03-Oct-2007 |
Gabe Black <gblack@eecs.umich.edu> |
X86: Put ldst into the microcode (the earlier changeset didn't really).
Also clean things up as much as possible so that faulting won't break an
instruction. More microops which verify addresses are needed.
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| #
5081:2ccce8600a9d |
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19-Sep-2007 |
Gabe Black <gblack@eecs.umich.edu> |
X86: Put in stubs for x87, 64 bit and 128 bit SIMD instruction microcode.
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