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[v5,05/16] riscv: Introduce feature variables for RISC-V GNU properties

Message ID 20260628070241.88310-6-jesse.huang@sifive.com (mailing list archive)
State New
Headers
Series Support RISC-V Control Flow Integrifty (CFI) |

Checks

Context Check Description
redhat-pt-bot/TryBot-apply_patch success Patch applied to master at the time it was sent

Commit Message

Jesse Huang June 28, 2026, 7:02 a.m. UTC 
  The l_riscv_feature_1_and member is added to struct link_map.  It stores
the feature_1_and property information for each object.

The new global _dl_riscv_feature_1 stores the features that are finally
enabled for this process.

Reviewed-by: Deepak Gupta <debug@rivosinc.com>
---
 sysdeps/riscv/dl-procruntime.c | 60 ++++++++++++++++++++++++++++++++++
 sysdeps/riscv/link_map.h       | 22 +++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 sysdeps/riscv/dl-procruntime.c
 create mode 100644 sysdeps/riscv/link_map.h
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Patch

diff --git a/sysdeps/riscv/dl-procruntime.c b/sysdeps/riscv/dl-procruntime.c
new file mode 100644
index 0000000000..06a582920e
--- /dev/null
+++ b/sysdeps/riscv/dl-procruntime.c
@@ -0,0 +1,60 @@ 
+/* Data for processor runtime information.  RISC-V version.
+   Copyright (C) 2026 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* This information must be kept in sync with the _DL_HWCAP_COUNT,
+   HWCAP_PLATFORMS_START and HWCAP_PLATFORMS_COUNT definitions in
+   dl-hwcap.h.
+
+   If anything should be added here check whether the size of each string
+   is still ok with the given array size.
+
+   All the #ifdefs in the definitions are quite irritating but
+   necessary if we want to avoid duplicating the information.  There
+   are three different modes:
+
+   - PROCINFO_DECL is defined.  This means we are only interested in
+     declarations.
+
+   - PROCINFO_DECL is not defined:
+
+     + if SHARED is defined the file is included in an array
+       initializer.  The .element = { ... } syntax is needed.
+
+     + if SHARED is not defined a normal array initialization is
+       needed.
+  */
+
+#ifndef PROCINFO_CLASS
+# define PROCINFO_CLASS
+#endif
+
+#if !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL && defined SHARED
+  ._dl_riscv_feature_1
+# else
+PROCINFO_CLASS unsigned int _dl_riscv_feature_1
+# endif
+# ifndef PROCINFO_DECL
+= 0
+# endif
+# if !defined SHARED || defined PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
diff --git a/sysdeps/riscv/link_map.h b/sysdeps/riscv/link_map.h
new file mode 100644
index 0000000000..4a6428bb24
--- /dev/null
+++ b/sysdeps/riscv/link_map.h
@@ -0,0 +1,22 @@ 
+/* Additional fields in struct link_map.  Linux/RISC-V version.
+   Copyright (C) 2026 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* GNU_PROPERTY_RISCV_FEATURE_1_AND of this object.  */
+unsigned int l_riscv_feature_1_and;
+
+#include <sysdeps/generic/link_map.h>