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authorJason Lowe-Power <jason@lowepower.com>2017-02-10 11:19:34 -0500
committerJason Lowe-Power <jason@lowepower.com>2017-02-10 11:19:34 -0500
commit153e5879c606c5d42ad9f2059488f67d8685a5d1 (patch)
tree80ab796da9bd7341191eff8739587e6db189284b /src/mem/cache
parent87b9f0b87b748fb8db87e2ff81d74bb76ec4769b (diff)
downloadgem5-153e5879c606c5d42ad9f2059488f67d8685a5d1.tar.xz
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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