or1k: ABI Implementation

This code deals with the OpenRISC ABI.

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

12 files changed, 419 insertions, 0 deletions

diff --git a/sysdeps/or1k/__longjmp.S b/sysdeps/or1k/__longjmp.S
new file mode 100644
index 0000000..e7f6313
--- /dev/null
+++ b/sysdeps/or1k/__longjmp.S
@@ -0,0 +1,50 @@
+/* longjmp, 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.h>
+
+ENTRY (__longjmp)
+	l.lwz	r1, 0(r3)
+	l.lwz	r2, 4(r3)
+
+	/* if r4 is 0, something wrong, so set it to 1 */
+	l.sfeqi	r4, 0x0
+	l.bnf	1f		/* r4 != 0, longjmp value sensible */
+	 l.nop
+	l.ori	r4, r0, 0x1	/* make nonzero */
+1:
+	l.addi	r11, r4, 0
+	l.lwz	r9, 8(r3)
+	l.lwz	r10, 12(r3)
+	l.lwz	r14, 16(r3)
+	l.lwz	r16, 20(r3)
+	l.lwz	r18, 24(r3)
+	l.lwz	r20, 28(r3)
+	l.lwz	r22, 32(r3)
+	l.lwz	r24, 36(r3)
+	l.lwz	r26, 40(r3)
+	l.lwz	r28, 44(r3)
+	l.lwz	r30, 48(r3)
+	l.jr	r9
+	 l.nop
+END (__longjmp)
+libc_hidden_def (__longjmp)
diff --git a/sysdeps/or1k/bits/endianness.h b/sysdeps/or1k/bits/endianness.h
new file mode 100644
index 0000000..7b61d8a
--- /dev/null
+++ b/sysdeps/or1k/bits/endianness.h
@@ -0,0 +1,11 @@
+#ifndef _BITS_ENDIANNESS_H
+#define _BITS_ENDIANNESS_H 1
+
+#ifndef _BITS_ENDIAN_H
+# error "Never use <bits/endianness.h> directly; include <endian.h> instead."
+#endif
+
+/* OpenRISC is big-endian.  */
+#define __BYTE_ORDER __BIG_ENDIAN
+
+#endif /* bits/endianness.h */
diff --git a/sysdeps/or1k/bits/setjmp.h b/sysdeps/or1k/bits/setjmp.h
new file mode 100644
index 0000000..5cc53c6
--- /dev/null
+++ b/sysdeps/or1k/bits/setjmp.h
@@ -0,0 +1,32 @@
+/* Define the machine-dependent type `jmp_buf'.  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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+#ifndef _OR1K_BITS_SETJMP_H
+#define _OR1K_BITS_SETJMP_H  1
+
+#if !defined _SETJMP_H && !defined _PTHREAD_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+#ifndef _ASM
+typedef long int __jmp_buf[13];
+#endif
+
+#endif /* _OR1K_BITS_SETJMP_H */
diff --git a/sysdeps/or1k/bsd-_setjmp.S b/sysdeps/or1k/bsd-_setjmp.S
new file mode 100644
index 0000000..4e6a2da
--- /dev/null
+++ b/sysdeps/or1k/bsd-_setjmp.S
@@ -0,0 +1 @@
+/* _setjmp is in setjmp.S  */
diff --git a/sysdeps/or1k/bsd-setjmp.S b/sysdeps/or1k/bsd-setjmp.S
new file mode 100644
index 0000000..1da848d
--- /dev/null
+++ b/sysdeps/or1k/bsd-setjmp.S
@@ -0,0 +1 @@
+/* setjmp is in setjmp.S  */
diff --git a/sysdeps/or1k/dl-trampoline.S b/sysdeps/or1k/dl-trampoline.S
new file mode 100644
index 0000000..d2936cb
--- /dev/null
+++ b/sysdeps/or1k/dl-trampoline.S
@@ -0,0 +1,73 @@
+/* Machine-dependent ELF runtime symbol resolution, 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+
+/* This code is plugged into the PLT and used by the dynamic linker to
+   call _dl_fixup (dl-runtime.c).
+
+   We assume that R11 contains the relocation offset and R12 contains
+   link_map (_DYNAMIC).  This must be consistent with the JUMP_SLOT
+   layout generated by binutils.  */
+
+ENTRY (_dl_runtime_resolve)
+	l.sw	-4(r1), r9
+	l.sw	-8(r1), r1
+
+	/* save function arguments.  */
+	l.sw	-12(r1), r3
+	l.sw	-16(r1), r4
+	l.sw	-20(r1), r5
+	l.sw	-24(r1), r6
+	l.sw	-28(r1), r7
+	l.sw	-32(r1), r8
+
+	.cfi_offset 9, -4
+	.cfi_offset 1, -8
+	.cfi_offset 3, -12
+	.cfi_offset 4, -16
+	.cfi_offset 5, -20
+	.cfi_offset 6, -24
+	.cfi_offset 7, -28
+	.cfi_offset 8, -32
+
+	l.addi	r1,r1, -32
+	.cfi_def_cfa_offset 32
+
+	l.ori	r3, r12, 0
+	l.ori	r4, r11, 0
+
+	l.jal	_dl_fixup
+	 l.nop
+
+	/* Restore function arguments.  */
+	l.addi	r1,r1, 32
+	l.lwz	r8, -32(r1)
+	l.lwz	r7, -28(r1)
+	l.lwz	r6, -24(r1)
+	l.lwz	r5, -20(r1)
+	l.lwz	r4, -16(r1)
+	l.lwz	r3, -12(r1)
+
+	/* restore return address.  */
+	l.lwz	r9, -4(r1)
+
+	l.jr	r11
+	 l.nop
+END (_dl_runtime_resolve)
diff --git a/sysdeps/or1k/jmpbuf-offsets.h b/sysdeps/or1k/jmpbuf-offsets.h
new file mode 100644
index 0000000..b878252
--- /dev/null
+++ b/sysdeps/or1k/jmpbuf-offsets.h
@@ -0,0 +1,23 @@
+/* Private macros for accessing __jmp_buf contents.  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/>.  */
+
+#define __JMP_BUF_SP    0
+
+/* Helper for generic function ____longjmp_chk.  */
+#define JB_FRAME_ADDRESS(buf) \
+    ((void *) (unsigned long) (buf[__JMP_BUF_SP]))
diff --git a/sysdeps/or1k/jmpbuf-unwind.h b/sysdeps/or1k/jmpbuf-unwind.h
new file mode 100644
index 0000000..5714ac8
--- /dev/null
+++ b/sysdeps/or1k/jmpbuf-unwind.h
@@ -0,0 +1,36 @@
+/* Macros to help frame unwinding using jmpbuf.  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/>.  */
+
+#include <setjmp.h>
+#include <jmpbuf-offsets.h>
+#include <stdint.h>
+#include <unwind.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
+  ((void *) (address) < (void *) demangle (jmpbuf[__JMP_BUF_SP]))
+
+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
+  _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
+
+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
+  ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf)[__JMP_BUF_SP] - (_adj))
+
+/* We use the normal longjmp for unwinding.  */
+#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
diff --git a/sysdeps/or1k/machine-gmon.h b/sysdeps/or1k/machine-gmon.h
new file mode 100644
index 0000000..0182c64
--- /dev/null
+++ b/sysdeps/or1k/machine-gmon.h
@@ -0,0 +1,35 @@
+/* Machine-dependent definitions for profiling support.  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/>.  */
+
+#include <sysdep.h>
+
+#define _MCOUNT_DECL(frompc, selfpc)					\
+static void								\
+__mcount_internal (unsigned long int frompc, unsigned long int selfpc)
+
+/* This is very simple as gcc does all the heavy lifting at the _mcount
+   call site.  GCC passes in the return address of the function calling
+   _mcount.  */
+
+#define MCOUNT								\
+void									\
+_mcount (void *frompc)							\
+{									\
+  __mcount_internal ((unsigned long int) frompc,			\
+		     (unsigned long int) __builtin_return_address (0));	\
+}
diff --git a/sysdeps/or1k/memusage.h b/sysdeps/or1k/memusage.h
new file mode 100644
index 0000000..ab0aa9b
--- /dev/null
+++ b/sysdeps/or1k/memusage.h
@@ -0,0 +1,21 @@
+/* Definitions for memory usage profiling.  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/>.  */
+
+#define GETSP() ({ register uintptr_t stack_ptr asm ("r1"); stack_ptr; })
+
+#include <sysdeps/generic/memusage.h>
diff --git a/sysdeps/or1k/setjmp.S b/sysdeps/or1k/setjmp.S
new file mode 100644
index 0000000..cf74467
--- /dev/null
+++ b/sysdeps/or1k/setjmp.S
@@ -0,0 +1,56 @@
+/* setjmp, 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.h>
+
+ENTRY (_setjmp)
+	l.addi	r4, r0, 0     /* Set second argument to 0.  */
+	l.j	.Local__sigsetjmp
+	 l.nop
+END (_setjmp)
+libc_hidden_def (_setjmp)
+
+ENTRY (setjmp)
+	l.addi	r4, r0, 1     /* Set second argument to 1.  */
+	l.j	.Local__sigsetjmp
+	 l.nop
+END (setjmp)
+
+ENTRY (__sigsetjmp)
+.Local__sigsetjmp:
+	l.sw	0(r3), r1
+	l.sw	4(r3), r2
+	l.sw	8(r3), r9
+	l.sw	12(r3), r10
+	l.sw	16(r3), r14
+	l.sw	20(r3), r16
+	l.sw	24(r3), r18
+	l.sw	28(r3), r20
+	l.sw	32(r3), r22
+	l.sw	36(r3), r24
+	l.sw	40(r3), r26
+	l.sw	44(r3), r28
+	l.sw	48(r3), r30
+	l.j	__sigjmp_save
+	 l.nop
+END (__sigsetjmp)
+hidden_def (__sigsetjmp)
diff --git a/sysdeps/or1k/sysdep.h b/sysdeps/or1k/sysdep.h
new file mode 100644
index 0000000..14e5dce
--- /dev/null
+++ b/sysdeps/or1k/sysdep.h
@@ -0,0 +1,80 @@
+/* Assembler macro definitions.  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/>.  */
+
+#include <sysdeps/generic/sysdep.h>
+#include <features.h>
+
+#if defined __ASSEMBLER__ || defined REQUEST_ASSEMBLER_MACROS
+
+/* Make use of .size directive.  */
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
+
+/* Define an entry point visible from C.  */
+#define ENTRY(name)                                                           \
+  .globl C_SYMBOL_NAME(name);                                                 \
+  .type C_SYMBOL_NAME(name),@function;                                        \
+  .align 4;                                                                   \
+  C_LABEL(name)                                                               \
+  cfi_startproc;                                                              \
+  CALL_MCOUNT
+
+#undef  END
+#define END(name)                                                             \
+  cfi_endproc;                                                                \
+  ASM_SIZE_DIRECTIVE(name)
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define syscall_error   __syscall_error
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef  PROF
+# ifdef __PIC__
+#  define CALL_MCOUNT						\
+	l.addi	r1, r1, -8;					\
+	l.sw	0(r1), r9;					\
+	l.sw	4(r1), r3;					\
+	l.ori	r3, r9, 0;					\
+	l.j	plt(_mcount);					\
+	 l.nop;							\
+	l.lwz	r9, 0(r1);					\
+	l.lwz	r3, 4(r1);					\
+	l.addi	r1, r1, 8;
+# else
+#  define CALL_MCOUNT						\
+	l.addi	r1, r1, -8;					\
+	l.sw	0(r1), r9;					\
+	l.sw	4(r1), r3;					\
+	l.ori	r3, r9, 0;					\
+	l.movhi r15, hi(_mcount);				\
+	l.ori	r15, r15, lo(_mcount);				\
+	l.jr	r15;						\
+	 l.nop;							\
+	l.lwz	r9, 0(r1);					\
+	l.lwz	r3, 4(r1);					\
+	l.addi	r1, r1, 8;
+# endif
+#else
+# define CALL_MCOUNT             /* Do nothing.  */
+#endif
+
+/* Local label name for asm code.  */
+#define L(name)         .L##name
+
+#endif /* __ASSEMBLER__ */