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coreboot-kgpe-d16/payloads/libpayload/arch/x86/exec.S

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libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* calling syntax: i386_do_exec(long addr, int argc, char **argv, int *ret) */
/* This implements the payload API detailed here:
Use more secure HTTPS URLs for coreboot sites The coreboot sites support HTTPS, and requests over HTTP with SSL are also redirected. So use the more secure URLs, which also saves a request most of the times, as nothing needs to be redirected. Run the command below to replace all occurences. ``` $ git grep -l -E 'http://(www.|review.|)coreboot.org' | xargs sed -i 's,http://\(.*\)coreboot.org,https://\1coreboot.org,g' ``` Change-Id: If53f8b66f1ac72fb1a38fa392b26eade9963c369 Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-on: https://review.coreboot.org/20034 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2017-06-05 12:33:23 +02:00
* https://www.coreboot.org/Payload_API
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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*/
.align 4
.text
.global i386_do_exec
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
.type i386_do_exec,@function
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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i386_do_exec:
pushl %ebp
movl %esp, %ebp
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
/* Save the remaining callee preserved registers */
pushl %ebx
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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pushl %esi
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
pushl %edi
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
2008-05-20 22:10:49 +02:00
libpayload: x86/exec - fix argc/argv value passing According to coreboot’s payload API [1] the argc value should be passed at stack offset 0x10, so we need to push a dummy value to comply to the API. [1] https://www.coreboot.org/Payload_API Change-Id: Id20424185a5bf7e4d94de1886a2cece3f3968371 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18333 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2017-02-11 22:34:46 +01:00
/* Push argc and argv on to the stack.
*
* We need to put a dummy value inbetween, as argc should be at offset
* 0x10, according to the payload API.
*/
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
pushl 12(%ebp)
libpayload: x86/exec - fix argc/argv value passing According to coreboot’s payload API [1] the argc value should be passed at stack offset 0x10, so we need to push a dummy value to comply to the API. [1] https://www.coreboot.org/Payload_API Change-Id: Id20424185a5bf7e4d94de1886a2cece3f3968371 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18333 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2017-02-11 22:34:46 +01:00
pushl $0
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
pushl 16(%ebp)
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
2008-05-20 22:10:49 +02:00
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
/* Push a "magic" number on the stack - the other payload will use this
* as a clue that the argc and argv values on the stack are sane.
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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*/
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
pushl $0x12345678
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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/* Jump to the code */
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
call *8(%ebp)
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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/* %eax has the return value */
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
/* Skip over the argc/argv stuff still on the stack.
* Don't assume %ebp is sane, here. Restore it from the stack.
*/
addl $0x10, %esp
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
2008-05-20 22:10:49 +02:00
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
/* Restore the saved registers */
popl %edi
popl %esi
popl %ebx
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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popl %ebp
libpayload: x86/exec - simplify and robustify the code Simplify the code by directly using the arguments on the stack as base pointer relative memory references, instead of loading them into intermediate registers first. Make it more robust by preserving all callee saved registers mandated by the C calling convention (and only those), namely EBP, EBX, ESI and EDI. Don't assume anything about the register state when the called function returns -- beside the segment registers and the stack pointer to be still the same as before the call. Change-Id: I383d6ccefc5b3d5cca37a1c9b638c231bbc48aa8 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18335 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
2017-02-11 21:02:08 +01:00
/* Get pointer to return value and save the return value in it. */
movl 16(%esp), %ecx
libpayload: x86/exec - fix return value passing The pointer to write the return value to is in %ecx, not %eax. Writing to (%eax) leads to memory corruptions as %eax holds the return value, e.g. would write zero to address zero for a "successful" returning payload. Change-Id: I82df27ae89a9e3d25f479ebdda2b50ea57565459 Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-on: https://review.coreboot.org/18332 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2017-02-07 19:47:16 +01:00
movl %eax, (%ecx)
libpayload: Add an exec() and i386_do_exec() function Add functions for libpayload to execute other payloads in memory, and have those functions return cleanly. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3338 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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ret