71 lines
1.8 KiB
Diff
71 lines
1.8 KiB
Diff
From: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed, 23 Dec 2020 15:49:04 +0100 (06:49 -0800)
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Subject: [PATCH] liblzma: Enable Intel CET in x86 CRC assembly codes
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When Intel CET is enabled, we need to include <cet.h> in assembly codes
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to mark Intel CET support and add _CET_ENDBR to indirect jump targets.
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Tested on Intel Tiger Lake under CET enabled Linux.
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---
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src/liblzma/check/crc32_x86.S | 9 +++++++++
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src/liblzma/check/crc64_x86.S | 9 +++++++++
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2 files changed, 18 insertions(+)
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diff --git a/src/liblzma/check/crc32_x86.S b/src/liblzma/check/crc32_x86.S
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index 67f68a4..e3745e6 100644
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--- a/src/liblzma/check/crc32_x86.S
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+++ b/src/liblzma/check/crc32_x86.S
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@@ -51,6 +51,14 @@ init_table(void)
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* extern uint32_t lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc);
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*/
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+/* When Intel CET is enabled, include <cet.h> in assembly code to mark
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+ Intel CET support. */
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+#ifdef __CET__
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+# include <cet.h>
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+#else
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+# define _CET_ENDBR
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+#endif
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+
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/*
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* On some systems, the functions need to be prefixed. The prefix is
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* usually an underscore.
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@@ -83,6 +91,7 @@ init_table(void)
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ALIGN(4, 16)
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LZMA_CRC32:
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+ _CET_ENDBR
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/*
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* Register usage:
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* %eax crc
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diff --git a/src/liblzma/check/crc64_x86.S b/src/liblzma/check/crc64_x86.S
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index f5bb84b..7ee08f6 100644
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--- a/src/liblzma/check/crc64_x86.S
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+++ b/src/liblzma/check/crc64_x86.S
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@@ -41,6 +41,14 @@ init_table(void)
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* extern uint64_t lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc);
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*/
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+/* When Intel CET is enabled, include <cet.h> in assembly code to mark
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+ Intel CET support. */
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+#ifdef __CET__
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+# include <cet.h>
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+#else
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+# define _CET_ENDBR
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+#endif
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+
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/*
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* On some systems, the functions need to be prefixed. The prefix is
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* usually an underscore.
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@@ -73,6 +81,7 @@ init_table(void)
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ALIGN(4, 16)
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LZMA_CRC64:
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+ _CET_ENDBR
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/*
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* Register usage:
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* %eax crc LSB
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--
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2.26.0
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