or1k: startup and dynamic linking code

Code for C runtime startup and dynamic loading including PLT layout.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/sysdeps/or1k/bits/link.h b/sysdeps/or1k/bits/link.h
new file mode 100644
index 0000000000..16b3fada2c
--- /dev/null
+++ b/sysdeps/or1k/bits/link.h
@@ -0,0 +1,54 @@
+/* Declarations for dynamic linker interface. OpenRISC version.
+   Copyright (C) 2022 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/>.  */
+
+#ifndef _LINK_H
+# error "Never include <bits/link.h> directly; use <link.h> instead."
+#endif
+
+/* Registers for entry into PLT.  */
+typedef struct La_or1k_regs
+{
+  uint32_t lr_reg[6]; /* Args passed in r3-r8.  */
+  uint32_t lr_sp;     /* Register r1.  */
+  uint32_t lr_lr;     /* Register r9.  */
+} La_or1k_regs;
+
+/* Return values for calls from PLT.  */
+typedef struct La_or1k_retval
+{
+  /* Up to two 32-bit registers used for a return value.  */
+  uint32_t lrv_reg[2];
+} La_or1k_retval;
+
+__BEGIN_DECLS
+
+extern Elf32_Addr la_or1k_gnu_pltenter (Elf32_Sym *__sym, unsigned int __ndx,
+					uintptr_t *__refcook,
+					uintptr_t *__defcook,
+					La_or1k_regs *__regs,
+					unsigned int *__flags,
+					const char *__symname,
+					long int *__framesizep);
+extern unsigned int la_or1k_gnu_pltexit (Elf32_Sym *__sym, unsigned int __ndx,
+					 uintptr_t *__refcook,
+					 uintptr_t *__defcook,
+					 const La_or1k_regs *__inregs,
+					 La_or1k_retval *__outregs,
+					 const char *__symname);
+
+__END_DECLS