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[edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version

Ard Biesheuvel posted 5 patches 2 years, 10 months ago
There is a newer version of this series
[edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
Posted by Ard Biesheuvel 2 years, 10 months ago 
Currently, we use the non-Xcode5 version of ExceptionHandlerAsm.nasm
only for the SEC and PEI phases, and this version was not compatible
with the XCODE or LLD linkers, which do not permit absolute relocations
in read-only sections.

Given that SEC and PEI code typically executes in place from flash and
does not use page alignment for sections, we can simply emit the code
carrying the absolute symbol references into the .data segment instead.
This works around the linker's objections, and the resulting image will
be mapped executable in its entirety anyway. Since this is only needed
for XCODE, let's make this change conditionally using a preprocessor
macro.

Let's rename the .nasm file to reflect the fact that is used for the
SecPei flavor of this library only, and while at it, remove some
unnecessary absolute references.

Also update the Xcode specific version of this library, and use this
source file instead. This is necesessary, as the Xcode specific version
modifies its own code at runtime, which is not permitted in SEC or PEI.
Note that this also removes CET support from the Xcode5 specific build
of the SEC/PEI version of this library, but this is not needed this
early in any case, and this aligns it with other toolchains, which use
this version of the library, which does not have CET support either.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf                                 |  4 +++-
 UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/{ExceptionHandlerAsm.nasm => SecPeiExceptionHandlerAsm.nasm} | 12 ++++++++----
 UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf                           |  4 +++-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf b/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
index df44371fe018e06d..885bb6638ab58620 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
@@ -28,7 +28,7 @@ [Sources.Ia32]
   Ia32/ArchInterruptDefs.h
 
 [Sources.X64]
-  X64/ExceptionHandlerAsm.nasm
+  X64/SecPeiExceptionHandlerAsm.nasm
   X64/ArchExceptionHandler.c
   X64/ArchInterruptDefs.h
 
@@ -58,3 +58,5 @@ [Pcd]
 [FeaturePcd]
   gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStackGuard                    ## CONSUMES
 
+[BuildOptions]
+  XCODE:*_*_X64_PP_FLAGS = -DNO_ABSOLUTE_RELOCS_IN_TEXT
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandlerAsm.nasm
similarity index 94%
rename from UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
rename to UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandlerAsm.nasm
index aaf8d622e6f3b8f1..ec45c60181906c14 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandlerAsm.nasm
@@ -27,7 +27,9 @@ extern ASM_PFX(CommonExceptionHandler)
 SECTION .data
 
 DEFAULT REL
+#ifndef NO_ABSOLUTE_RELOCS_IN_TEXT
 SECTION .text
+#endif
 
 ALIGN   8
 
@@ -51,6 +53,9 @@ HookAfterStubHeaderBegin:
     push    rax
     mov     rax, HookAfterStubHeaderEnd
     jmp     rax
+
+SECTION .text
+
 HookAfterStubHeaderEnd:
     mov     rax, rsp
     and     sp,  0xfff0        ; make sure 16-byte aligned for exception context
@@ -276,8 +281,7 @@ DrFinish:
     ; and make sure RSP is 16-byte aligned
     ;
     sub     rsp, 4 * 8 + 8
-    mov     rax, ASM_PFX(CommonExceptionHandler)
-    call    rax
+    call    ASM_PFX(CommonExceptionHandler)
     add     rsp, 4 * 8 + 8
 
     cli
@@ -384,10 +388,10 @@ DoIret:
 ; comments here for definition of address map
 global ASM_PFX(AsmGetTemplateAddressMap)
 ASM_PFX(AsmGetTemplateAddressMap):
-    mov     rax, AsmIdtVectorBegin
+    lea     rax, [AsmIdtVectorBegin]
     mov     qword [rcx], rax
     mov     qword [rcx + 0x8],  (AsmIdtVectorEnd - AsmIdtVectorBegin) / 32
-    mov     rax, HookAfterStubHeaderBegin
+    lea     rax, [HookAfterStubHeaderBegin]
     mov     qword [rcx + 0x10], rax
     ret
 
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf
index 619b39d7f1de9ae3..17f872bb15eb0ff7 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf
@@ -33,7 +33,7 @@ [Sources.Ia32]
   Ia32/ArchInterruptDefs.h
 
 [Sources.X64]
-  X64/Xcode5ExceptionHandlerAsm.nasm
+  X64/SecPeiExceptionHandlerAsm.nasm
   X64/ArchExceptionHandler.c
   X64/ArchInterruptDefs.h
 
@@ -63,3 +63,5 @@ [Pcd]
 [FeaturePcd]
   gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStackGuard                    ## CONSUMES
 
+[BuildOptions]
+  XCODE:*_*_X64_PP_FLAGS = -DNO_ABSOLUTE_RELOCS_IN_TEXT
-- 
2.39.2



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Re: [edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
Posted by Ni, Ray 2 years, 10 months ago 
Ard,
Thanks for the detailed commit messages. That really helps me to understand why XCODE version
was needed.

However, I feel it would be great if you can "highlight" what are changed by this patch.
The following is just an example. You can reword as you like.

1. Change for non-XCODE SecPeiCpuExceptionHandlerLib:
   * Use SecPeiExceptionHandlerAsm.nasm (renamed from ExceptionHandlerAsm.nasm)
   * Removed some unnecessary absolute references
   * (32 IDT stubs are still in .text.)
2. Change for XCODE SecPeiCpuExceptionHandlerLib:
   * Use SecPeiExceptionHandlerAsm.nasm instead of Xcode5ExceptionHandlerAsm.nasm
   * CET logic is not in SecPeiExceptionHandlerAsm.nasm (but aligns to non-XCODE lib instance)
   * Fixed a bug that does runtime fixup in TEXT section in SPI flash.
   * Emitted the code carrying the absolute symbol references into the .data which XCODE or
      LLD linkers allow.
     Then fixup can be done by other build tools such as GenFv if the code runs in SPI flash,
     or by PE coff loader if the code is loaded to memory.

Again, thanks for the quick patches just because I asked some XCODE questions.

Thanks,
Ray

> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Friday, March 31, 2023 5:15 PM
> To: devel@edk2.groups.io
> Cc: Ard Biesheuvel <ardb@kernel.org>; Ni, Ray <ray.ni@intel.com>; Andrew
> Fish <afish@apple.com>; Kinney, Michael D <michael.d.kinney@intel.com>;
> Liu, Zhiguang <zhiguang.liu@intel.com>; Rebecca Cran
> <rebecca@bsdio.com>; Tom Lendacky <thomas.lendacky@amd.com>;
> Marvin Häuser <mhaeuser@posteo.de>
> Subject: [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single
> SEC/PEI version
> 
> Currently, we use the non-Xcode5 version of ExceptionHandlerAsm.nasm
> only for the SEC and PEI phases, and this version was not compatible
> with the XCODE or LLD linkers, which do not permit absolute relocations
> in read-only sections.
> 
> Given that SEC and PEI code typically executes in place from flash and
> does not use page alignment for sections, we can simply emit the code
> carrying the absolute symbol references into the .data segment instead.
> This works around the linker's objections, and the resulting image will
> be mapped executable in its entirety anyway. Since this is only needed
> for XCODE, let's make this change conditionally using a preprocessor
> macro.
> 
> Let's rename the .nasm file to reflect the fact that is used for the
> SecPei flavor of this library only, and while at it, remove some
> unnecessary absolute references.
> 
> Also update the Xcode specific version of this library, and use this
> source file instead. This is necesessary, as the Xcode specific version
> modifies its own code at runtime, which is not permitted in SEC or PEI.
> Note that this also removes CET support from the Xcode5 specific build
> of the SEC/PEI version of this library, but this is not needed this
> early in any case, and this aligns it with other toolchains, which use
> this version of the library, which does not have CET support either.
> 
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> 
> UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib
> .inf                                 |  4 +++-
> 
> UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/{ExceptionHandlerAsm.na
> sm => SecPeiExceptionHandlerAsm.nasm} | 12 ++++++++----
> 
> UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHa
> ndlerLib.inf                           |  4 +++-
>  3 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandler
> Lib.inf
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandler
> Lib.inf
> index df44371fe018e06d..885bb6638ab58620 100644
> ---
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandler
> Lib.inf
> +++
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandler
> Lib.inf
> @@ -28,7 +28,7 @@ [Sources.Ia32]
>    Ia32/ArchInterruptDefs.h
> 
> 
> 
>  [Sources.X64]
> 
> -  X64/ExceptionHandlerAsm.nasm
> 
> +  X64/SecPeiExceptionHandlerAsm.nasm
> 
>    X64/ArchExceptionHandler.c
> 
>    X64/ArchInterruptDefs.h
> 
> 
> 
> @@ -58,3 +58,5 @@ [Pcd]
>  [FeaturePcd]
> 
>    gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStackGuard                    ##
> CONSUMES
> 
> 
> 
> +[BuildOptions]
> 
> +  XCODE:*_*_X64_PP_FLAGS = -DNO_ABSOLUTE_RELOCS_IN_TEXT
> 
> diff --git
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.n
> asm
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandler
> Asm.nasm
> similarity index 94%
> rename from
> UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nas
> m
> rename to
> UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandlerA
> sm.nasm
> index aaf8d622e6f3b8f1..ec45c60181906c14 100644
> ---
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.n
> asm
> +++
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/SecPeiExceptionHandler
> Asm.nasm
> @@ -27,7 +27,9 @@ extern ASM_PFX(CommonExceptionHandler)
>  SECTION .data
> 
> 
> 
>  DEFAULT REL
> 
> +#ifndef NO_ABSOLUTE_RELOCS_IN_TEXT
> 
>  SECTION .text
> 
> +#endif
> 
> 
> 
>  ALIGN   8
> 
> 
> 
> @@ -51,6 +53,9 @@ HookAfterStubHeaderBegin:
>      push    rax
> 
>      mov     rax, HookAfterStubHeaderEnd
> 
>      jmp     rax
> 
> +
> 
> +SECTION .text
> 
> +
> 
>  HookAfterStubHeaderEnd:
> 
>      mov     rax, rsp
> 
>      and     sp,  0xfff0        ; make sure 16-byte aligned for exception context
> 
> @@ -276,8 +281,7 @@ DrFinish:
>      ; and make sure RSP is 16-byte aligned
> 
>      ;
> 
>      sub     rsp, 4 * 8 + 8
> 
> -    mov     rax, ASM_PFX(CommonExceptionHandler)
> 
> -    call    rax
> 
> +    call    ASM_PFX(CommonExceptionHandler)
> 
>      add     rsp, 4 * 8 + 8
> 
> 
> 
>      cli
> 
> @@ -384,10 +388,10 @@ DoIret:
>  ; comments here for definition of address map
> 
>  global ASM_PFX(AsmGetTemplateAddressMap)
> 
>  ASM_PFX(AsmGetTemplateAddressMap):
> 
> -    mov     rax, AsmIdtVectorBegin
> 
> +    lea     rax, [AsmIdtVectorBegin]
> 
>      mov     qword [rcx], rax
> 
>      mov     qword [rcx + 0x8],  (AsmIdtVectorEnd - AsmIdtVectorBegin) / 32
> 
> -    mov     rax, HookAfterStubHeaderBegin
> 
> +    lea     rax, [HookAfterStubHeaderBegin]
> 
>      mov     qword [rcx + 0x10], rax
> 
>      ret
> 
> 
> 
> diff --git
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuException
> HandlerLib.inf
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuException
> HandlerLib.inf
> index 619b39d7f1de9ae3..17f872bb15eb0ff7 100644
> ---
> a/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuException
> HandlerLib.inf
> +++
> b/UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuException
> HandlerLib.inf
> @@ -33,7 +33,7 @@ [Sources.Ia32]
>    Ia32/ArchInterruptDefs.h
> 
> 
> 
>  [Sources.X64]
> 
> -  X64/Xcode5ExceptionHandlerAsm.nasm
> 
> +  X64/SecPeiExceptionHandlerAsm.nasm
> 
>    X64/ArchExceptionHandler.c
> 
>    X64/ArchInterruptDefs.h
> 
> 
> 
> @@ -63,3 +63,5 @@ [Pcd]
>  [FeaturePcd]
> 
>    gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmStackGuard                    ##
> CONSUMES
> 
> 
> 
> +[BuildOptions]
> 
> +  XCODE:*_*_X64_PP_FLAGS = -DNO_ABSOLUTE_RELOCS_IN_TEXT
> 
> --
> 2.39.2



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Re: [edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
Posted by Ard Biesheuvel 2 years, 10 months ago 
On Fri, 31 Mar 2023 at 11:56, Ni, Ray <ray.ni@intel.com> wrote:
>
> Ard,
> Thanks for the detailed commit messages. That really helps me to understand why XCODE version
> was needed.
>
> However, I feel it would be great if you can "highlight" what are changed by this patch.
> The following is just an example. You can reword as you like.
>
> 1. Change for non-XCODE SecPeiCpuExceptionHandlerLib:
>    * Use SecPeiExceptionHandlerAsm.nasm (renamed from ExceptionHandlerAsm.nasm)
>    * Removed some unnecessary absolute references
>    * (32 IDT stubs are still in .text.)

Indeed

> 2. Change for XCODE SecPeiCpuExceptionHandlerLib:
>    * Use SecPeiExceptionHandlerAsm.nasm instead of Xcode5ExceptionHandlerAsm.nasm
>    * CET logic is not in SecPeiExceptionHandlerAsm.nasm (but aligns to non-XCODE lib instance)

No, this does not actually change in this patch. The CET logic does
not exist in the generic SecPei version either before or after this
patch.

Only the Xcode version is changed, because that version uses the same
as the Dxe/Smm version, which does have the CET code.

>    * Fixed a bug that does runtime fixup in TEXT section in SPI flash.
>    * Emitted the code carrying the absolute symbol references into the .data which XCODE or
>       LLD linkers allow.
>      Then fixup can be done by other build tools such as GenFv if the code runs in SPI flash,
>      or by PE coff loader if the code is loaded to memory.
>
> Again, thanks for the quick patches just because I asked some XCODE questions.
>

No problem. I'd like to get this fixed too for OVMF.


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Re: [edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
Posted by Ni, Ray 2 years, 10 months ago 

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ard
> Biesheuvel
> Sent: Friday, March 31, 2023 6:13 PM
> To: devel@edk2.groups.io; Ni, Ray <ray.ni@intel.com>
> Cc: Andrew Fish <afish@apple.com>; Kinney, Michael D
> <michael.d.kinney@intel.com>; Liu, Zhiguang <zhiguang.liu@intel.com>;
> Rebecca Cran <rebecca@bsdio.com>; Tom Lendacky
> <thomas.lendacky@amd.com>; Marvin Häuser <mhaeuser@posteo.de>
> Subject: Re: [edk2-devel] [RFT PATCH v3 2/5]
> UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
> 
> On Fri, 31 Mar 2023 at 11:56, Ni, Ray <ray.ni@intel.com> wrote:
> >
> > Ard,
> > Thanks for the detailed commit messages. That really helps me to
> understand why XCODE version
> > was needed.
> >
> > However, I feel it would be great if you can "highlight" what are changed by
> this patch.
> > The following is just an example. You can reword as you like.
> >
> > 1. Change for non-XCODE SecPeiCpuExceptionHandlerLib:
> >    * Use SecPeiExceptionHandlerAsm.nasm (renamed from
> ExceptionHandlerAsm.nasm)
> >    * Removed some unnecessary absolute references
> >    * (32 IDT stubs are still in .text.)
> 
> Indeed
> 
> > 2. Change for XCODE SecPeiCpuExceptionHandlerLib:
> >    * Use SecPeiExceptionHandlerAsm.nasm instead of
> Xcode5ExceptionHandlerAsm.nasm
> >    * CET logic is not in SecPeiExceptionHandlerAsm.nasm (but aligns to non-
> XCODE lib instance)
> 
> No, this does not actually change in this patch. The CET logic does
> not exist in the generic SecPei version either before or after this
> patch.

Because of this patch, CET logic is removed from XCODE SecPeiCpuExceptionHandlerLib.


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Re: [edk2-devel] [RFT PATCH v3 2/5] UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
Posted by Ard Biesheuvel 2 years, 10 months ago 
On Fri, 31 Mar 2023 at 12:19, Ni, Ray <ray.ni@intel.com> wrote:
>
>
>
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ard
> > Biesheuvel
> > Sent: Friday, March 31, 2023 6:13 PM
> > To: devel@edk2.groups.io; Ni, Ray <ray.ni@intel.com>
> > Cc: Andrew Fish <afish@apple.com>; Kinney, Michael D
> > <michael.d.kinney@intel.com>; Liu, Zhiguang <zhiguang.liu@intel.com>;
> > Rebecca Cran <rebecca@bsdio.com>; Tom Lendacky
> > <thomas.lendacky@amd.com>; Marvin Häuser <mhaeuser@posteo.de>
> > Subject: Re: [edk2-devel] [RFT PATCH v3 2/5]
> > UefiCpuPkg/CpuExceptionHandlerLib: Use single SEC/PEI version
> >
> > On Fri, 31 Mar 2023 at 11:56, Ni, Ray <ray.ni@intel.com> wrote:
> > >
> > > Ard,
> > > Thanks for the detailed commit messages. That really helps me to
> > understand why XCODE version
> > > was needed.
> > >
> > > However, I feel it would be great if you can "highlight" what are changed by
> > this patch.
> > > The following is just an example. You can reword as you like.
> > >
> > > 1. Change for non-XCODE SecPeiCpuExceptionHandlerLib:
> > >    * Use SecPeiExceptionHandlerAsm.nasm (renamed from
> > ExceptionHandlerAsm.nasm)
> > >    * Removed some unnecessary absolute references
> > >    * (32 IDT stubs are still in .text.)
> >
> > Indeed
> >
> > > 2. Change for XCODE SecPeiCpuExceptionHandlerLib:
> > >    * Use SecPeiExceptionHandlerAsm.nasm instead of
> > Xcode5ExceptionHandlerAsm.nasm
> > >    * CET logic is not in SecPeiExceptionHandlerAsm.nasm (but aligns to non-
> > XCODE lib instance)
> >
> > No, this does not actually change in this patch. The CET logic does
> > not exist in the generic SecPei version either before or after this
> > patch.
>
> Because of this patch, CET logic is removed from XCODE SecPeiCpuExceptionHandlerLib.

Indeed - I will make that clear in the commit log.


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