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* [edk2-devel] [PATCH 1/1] BaseTools/tools_def: drop -mgeneral-regs-only for AArch64 CLANGDWARF
@ 2023-11-03 16:37 Yeping Song
  2023-11-06  1:03 ` [edk2-devel] 回复: " gaoliming via groups.io
  0 siblings, 1 reply; 4+ messages in thread
From: Yeping Song @ 2023-11-03 16:37 UTC (permalink / raw)
  To: devel
  Cc: Yeping Song, Rebecca Cran, Liming Gao, Bob Feng, Yuwei Chen,
	Ard Biesheuvel, Leif Lindholm, Sami Mujawar

Commit 0df6c8c157af9 ("BaseTools/tools_def AARCH64:
avoid SIMD registers in XIP code")
adds -mgeneral-regs-only to GCC_AARCH64_CC_XIPFLAGS,
in order to avoid a bug present in certain versions of GCC.
This was never a problem for clang.
That's given the history of what the problem is.
Then we can describe how we fix it:
Change *_CLANGDWARF_AARCH64_CC_XIPFLAGS to set the required -mstrict-align
option instead of importing the whole GCC variable.

Signed-off-by: Yeping Song <quic_yepings@quicinc.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
---
 BaseTools/Conf/tools_def.template | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index 5bd5283655ea..c34ecfd557c5 100755
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -2015,7 +2015,7 @@ DEFINE CLANGDWARF_AARCH64_DLINK_FLAGS  = DEF(CLANGDWARF_AARCH64_TARGET) DEF(GCC_
 *_CLANGDWARF_AARCH64_RC_FLAGS       = DEF(GCC_AARCH64_RC_FLAGS) DEF(GCC_AARCH64_RC_BTI_FLAGS)
 *_CLANGDWARF_AARCH64_VFRPP_FLAGS    = DEF(GCC_VFRPP_FLAGS) DEF(CLANGDWARF_AARCH64_TARGET) $(PLATFORM_FLAGS)
 *_CLANGDWARF_AARCH64_ASLPP_FLAGS    = DEF(GCC_ASLPP_FLAGS) DEF(CLANGDWARF_AARCH64_TARGET)
-*_CLANGDWARF_AARCH64_CC_XIPFLAGS    = DEF(GCC_AARCH64_CC_XIPFLAGS)
+*_CLANGDWARF_AARCH64_CC_XIPFLAGS    = -mstrict-align
 
   DEBUG_CLANGDWARF_AARCH64_CC_FLAGS    = DEF(CLANGDWARF_AARCH64_CC_FLAGS) $(PLATFORM_FLAGS) -flto -O1
   DEBUG_CLANGDWARF_AARCH64_DLINK_FLAGS = DEF(CLANGDWARF_AARCH64_DLINK_FLAGS) -flto -Wl,-O1 -fuse-ld=lld -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wl,--no-pie,--no-relax
-- 
2.25.1



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2023-11-03 16:37 [edk2-devel] [PATCH 1/1] BaseTools/tools_def: drop -mgeneral-regs-only for AArch64 CLANGDWARF Yeping Song
2023-11-06  1:03 ` [edk2-devel] 回复: " gaoliming via groups.io
     [not found] <17942B788A4667A6.3650@groups.io>
2023-11-07 13:11 ` [edk2-devel] " Yeping Song
2023-11-07 13:12   ` Leif Lindholm

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