153e5879c6
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>
194 lines
6.9 KiB
Python
194 lines
6.9 KiB
Python
# Copyright (c) 2007-2008 The Hewlett-Packard Development Company
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Gabe Black
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microcode = '''
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def macroop POP_R {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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ldis t1, ss, [1, t0, rsp], dataSize=ssz
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addi rsp, rsp, ssz, dataSize=asz
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mov reg, reg, t1
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};
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def macroop POP_M {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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ldis t1, ss, [1, t0, rsp], dataSize=ssz
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cda seg, sib, disp, dataSize=ssz
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addi rsp, rsp, ssz, dataSize=asz
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st t1, seg, sib, disp, dataSize=ssz
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};
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def macroop POP_P {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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rdip t7
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ld t1, ss, [1, t0, rsp], dataSize=ssz
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cda seg, sib, disp, dataSize=ssz
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addi rsp, rsp, ssz, dataSize=asz
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st t1, seg, riprel, disp, dataSize=ssz
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};
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def macroop PUSH_R {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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stis reg, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
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subi rsp, rsp, ssz
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};
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def macroop PUSH_I {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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limm t1, imm
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stis t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
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subi rsp, rsp, ssz
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};
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def macroop PUSH_M {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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ld t1, seg, sib, disp, dataSize=ssz
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st t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
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subi rsp, rsp, ssz
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};
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def macroop PUSH_P {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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rdip t7
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ld t1, seg, riprel, disp, dataSize=ssz
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st t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
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subi rsp, rsp, ssz
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};
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def macroop PUSHA {
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# Check all the stack addresses. We'll assume that if the beginning and
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# end are ok, then the stuff in the middle should be as well.
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cda ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
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cda ss, [1, t0, rsp], "-8 * env.stackSize", dataSize=ssz
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st rax, ss, [1, t0, rsp], "1 * -env.stackSize", dataSize=ssz
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st rcx, ss, [1, t0, rsp], "2 * -env.stackSize", dataSize=ssz
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st rdx, ss, [1, t0, rsp], "3 * -env.stackSize", dataSize=ssz
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st rbx, ss, [1, t0, rsp], "4 * -env.stackSize", dataSize=ssz
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st rsp, ss, [1, t0, rsp], "5 * -env.stackSize", dataSize=ssz
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st rbp, ss, [1, t0, rsp], "6 * -env.stackSize", dataSize=ssz
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st rsi, ss, [1, t0, rsp], "7 * -env.stackSize", dataSize=ssz
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st rdi, ss, [1, t0, rsp], "8 * -env.stackSize", dataSize=ssz
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subi rsp, rsp, "8 * env.stackSize"
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};
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def macroop POPA {
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# Check all the stack addresses. We'll assume that if the beginning and
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# end are ok, then the stuff in the middle should be as well.
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ld t1, ss, [1, t0, rsp], "0 * env.stackSize", dataSize=ssz
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ld t2, ss, [1, t0, rsp], "7 * env.stackSize", dataSize=ssz
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mov rdi, rdi, t1, dataSize=ssz
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ld rsi, ss, [1, t0, rsp], "1 * env.stackSize", dataSize=ssz
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ld rbp, ss, [1, t0, rsp], "2 * env.stackSize", dataSize=ssz
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ld rbx, ss, [1, t0, rsp], "4 * env.stackSize", dataSize=ssz
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ld rdx, ss, [1, t0, rsp], "5 * env.stackSize", dataSize=ssz
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ld rcx, ss, [1, t0, rsp], "6 * env.stackSize", dataSize=ssz
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mov rax, rax, t2, dataSize=ssz
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addi rsp, rsp, "8 * env.stackSize", dataSize=asz
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};
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def macroop LEAVE {
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# Make the default data size of pops 64 bits in 64 bit mode
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.adjust_env oszIn64Override
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mov t1, t1, rbp, dataSize=ssz
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ldis rbp, ss, [1, t0, t1], dataSize=ssz
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mov rsp, rsp, t1, dataSize=ssz
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addi rsp, rsp, ssz, dataSize=ssz
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};
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def macroop ENTER_I_I {
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.adjust_env oszIn64Override
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# This needs to check all the addresses it writes to before it actually
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# writes any values.
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# Pull the different components out of the immediate
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limm t1, imm, dataSize=8
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zexti t2, t1, 15, dataSize=8
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srli t1, t1, 16, dataSize=8
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zexti t1, t1, 5, dataSize=8
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# t1 is now the masked nesting level, and t2 is the amount of storage.
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# Push rbp.
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stis rbp, ss, [1, t0, rsp], "-env.dataSize"
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subi rsp, rsp, ssz
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# Save the stack pointer for later
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mov t6, t6, rsp
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# If the nesting level is zero, skip all this stuff.
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sub t0, t1, t0, flags=(EZF,), dataSize=2
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br label("skipLoop"), flags=(CEZF,)
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# If the level was 1, only push the saved rbp
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subi t0, t1, 1, flags=(EZF,)
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br label("bottomOfLoop"), flags=(CEZF,)
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limm t4, "ULL(-1)", dataSize=8
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topOfLoop:
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ldis t5, ss, [dsz, t4, rbp]
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stis t5, ss, [1, t0, rsp], "-env.dataSize"
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subi rsp, rsp, ssz
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# If we're not done yet, loop
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subi t4, t4, 1, dataSize=8
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add t0, t4, t1, flags=(EZF,)
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br label("topOfLoop"), flags=(nCEZF,)
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bottomOfLoop:
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# Push the old rbp onto the stack
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stis t6, ss, [1, t0, rsp], "-env.dataSize"
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subi rsp, rsp, ssz
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skipLoop:
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sub rsp, rsp, t2, dataSize=ssz
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mov rbp, rbp, t6
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};
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'''
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