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From db33cb0cac3253c34881c0377ada51d9803eaae0 Mon Sep 17 00:00:00 2001
From: Ying Huang <ying.huang@oss.cipunited.com>
Date: Tue, 5 Mar 2024 17:51:22 +0800
Subject: [PATCH] backends: Add register_info, return_value_location, core_note
on mips
* backends/Makefile.am (mips_SRCS): Add mips_regs.c,
mips_retval.c and mips_corenote.c.
* backends/mips_init.c (mips_init): HOOK register_info,
return_value_location and core_note.
* backends/mips_corenote.c: New file.
* backends/mips_regs.c: Likewise.
* backends/mips_retval.c: Likewise.
Signed-off-by: Ying Huang <ying.huang@oss.cipunited.com>
---
backends/Makefile.am | 3 +-
backends/mips_corenote.c | 85 +++++++++++++++++
backends/mips_init.c | 3 +
backends/mips_regs.c | 135 +++++++++++++++++++++++++++
backends/mips_retval.c | 196 +++++++++++++++++++++++++++++++++++++++
5 files changed, 421 insertions(+), 1 deletion(-)
create mode 100644 backends/mips_corenote.c
create mode 100644 backends/mips_regs.c
create mode 100644 backends/mips_retval.c
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -103,7 +103,8 @@ loongarch_SRCS = loongarch_init.c loonga
arc_SRCS = arc_init.c arc_symbol.c
mips_SRCS = mips_init.c mips_symbol.c mips_attrs.c mips_initreg.c \
- mips_cfi.c mips_unwind.c
+ mips_cfi.c mips_unwind.c mips_regs.c mips_retval.c \
+ mips_corenote.c
libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
$(ia64_SRCS) $(alpha_SRCS) $(arm_SRCS) \
--- /dev/null
+++ b/backends/mips_corenote.c
@@ -0,0 +1,85 @@
+/* MIPS specific core note handling.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <elf.h>
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/time.h>
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+
+#define BITS 64
+#ifndef BITS
+# define BITS 32
+#else
+# define BITS 64
+#endif
+
+#define PRSTATUS_REGS_SIZE (45 * (BITS / 8))
+static const Ebl_Register_Location prstatus_regs[] =
+ {
+ { .offset = 0, .regno = 0, .count = (BITS == 32 ? 40 : 34), .bits = BITS },
+ { .offset = BITS/8 * (BITS == 32 ? 41 : 35), .regno = (BITS == 32 ? 41 : 35), .count = (BITS == 32 ? 4 : 10), .bits = BITS },
+ };
+
+#define PRSTATUS_REGSET_ITEMS \
+ { \
+ .name = "pc", .type = ELF_T_ADDR, .format = 'x', \
+ .offset = offsetof (struct EBLHOOK(prstatus), pr_reg) + ((BITS/8) * (BITS == 32 ? 40 : 34)), \
+ .group = "register", \
+ .pc_register = true \
+ }
+
+#if BITS == 32
+# define ULONG uint32_t
+# define ALIGN_ULONG 4
+# define TYPE_ULONG ELF_T_WORD
+#define TYPE_LONG ELF_T_SWORD
+#else
+#define ULONG uint64_t
+#define ALIGN_ULONG 8
+#define TYPE_ULONG ELF_T_XWORD
+#define TYPE_LONG ELF_T_SXWORD
+#endif
+#define PID_T int32_t
+#define UID_T uint32_t
+#define GID_T uint32_t
+#define ALIGN_PID_T 4
+#define ALIGN_UID_T 4
+#define ALIGN_GID_T 4
+#define TYPE_PID_T ELF_T_SWORD
+#define TYPE_UID_T ELF_T_WORD
+#define TYPE_GID_T ELF_T_WORD
+
+#include "linux-core-note.c"
--- a/backends/mips_init.c
+++ b/backends/mips_init.c
@@ -61,6 +61,9 @@ mips_init (Elf *elf __attribute__ ((unus
HOOK (eh, set_initial_registers_tid);
HOOK (eh, abi_cfi);
HOOK (eh, unwind);
+ HOOK (eh, register_info);
+ HOOK (eh, return_value_location);
+ HOOK (eh, core_note);
eh->frame_nregs = 71;
return eh;
}
--- /dev/null
+++ b/backends/mips_regs.c
@@ -0,0 +1,135 @@
+/* Register names and numbers for mips DWARF.
+ Copyright (C) 2006 Red Hat, Inc.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+#include <string.h>
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+#include <system.h>
+ssize_t
+mips_register_info (Ebl *ebl __attribute__ ((unused)),
+ int regno, char *name, size_t namelen,
+ const char **prefix, const char **setname,
+ int *bits, int *type)
+{
+ if (name == NULL)
+ return 72;
+
+ if (regno < 0 || regno > 71 || namelen < 4)
+ return -1;
+
+ *prefix = "$";
+ if (regno < 38)
+ {
+ *setname = "integer";
+ *type = DW_ATE_signed;
+ *bits = 32;
+ }
+ else
+ {
+ *setname = "FPU";
+ *type = DW_ATE_float;
+ *bits = 64;
+ }
+
+ if (regno < 32)
+ {
+ if (regno < 10)
+ {
+ name[0] = regno + '0';
+ namelen = 1;
+ }
+ else
+ {
+ name[0] = (regno / 10) + '0';
+ name[1] = (regno % 10) + '0';
+ namelen = 2;
+ }
+ if (regno == 28 || regno == 29 || regno == 31)
+ *type = DW_ATE_address;
+ }
+ else if (regno == 32)
+ {
+ return stpcpy (name, "lo") + 1 - name;
+ }
+ else if (regno == 33)
+ {
+ return stpcpy (name, "hi") + 1 - name;
+ }
+ else if (regno == 34)
+ {
+ return stpcpy (name, "pc") + 1 - name;
+ }
+ else if (regno == 35)
+ {
+ *type = DW_ATE_address;
+ return stpcpy (name, "bad") + 1 - name;
+ }
+ else if (regno == 36)
+ {
+ return stpcpy (name, "sr") + 1 - name;
+ }
+ else if (regno == 37)
+ {
+ *type = DW_ATE_address;
+ return stpcpy (name, "cause") + 1 - name;
+ }
+ else if (regno < 70)
+ {
+ name[0] = 'f';
+ if (regno < 38 + 10)
+ {
+ name[1] = (regno - 38) + '0';
+ namelen = 2;
+ }
+ else
+ {
+ name[1] = (regno - 38) / 10 + '0';
+ name[2] = (regno - 38) % 10 + '0';
+ namelen = 3;
+ }
+ }
+ else if (regno == 70)
+ {
+ return stpcpy (name, "fsr") + 1 - name;
+ }
+ else if (regno == 71)
+ {
+ return stpcpy (name, "fir") + 1 - name;
+ }
+
+ name[namelen++] = '\0';
+ return namelen;
+}
--- /dev/null
+++ b/backends/mips_retval.c
@@ -0,0 +1,196 @@
+/* Function return value location for Linux/mips ABI.
+ Copyright (C) 2005 Red Hat, Inc.
+ Copyright (C) 2024 CIP United Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+#include <string.h>
+#include <elf.h>
+#include <stdio.h>
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+#include "libdwP.h"
+#include <stdio.h>
+
+/* $v0 or pair $v0, $v1 */
+static const Dwarf_Op loc_intreg_o32[] =
+ {
+ { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 4 },
+ { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 4 },
+ };
+
+static const Dwarf_Op loc_intreg[] =
+ {
+ { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 8 },
+ { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 8 },
+ };
+#define nloc_intreg 1
+#define nloc_intregpair 4
+
+/* $f0 (float), or pair $f0, $f1 (double).
+ * f2/f3 are used for COMPLEX (= 2 doubles) returns in Fortran */
+static const Dwarf_Op loc_fpreg_o32[] =
+ {
+ { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
+ { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
+ { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 4 },
+ { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 4 },
+ };
+
+/* $f0, or pair $f0, $f2. */
+static const Dwarf_Op loc_fpreg[] =
+ {
+ { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 8 },
+ { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
+ };
+#define nloc_fpreg 1
+#define nloc_fpregpair 4
+#define nloc_fpregquad 8
+
+/* The return value is a structure and is actually stored in stack space
+ passed in a hidden argument by the caller. But, the compiler
+ helpfully returns the address of that space in $v0. */
+static const Dwarf_Op loc_aggregate[] =
+ {
+ { .atom = DW_OP_breg2, .number = 0 }
+ };
+#define nloc_aggregate 1
+
+int
+mips_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+ unsigned int regsize = (gelf_getclass (functypedie->cu->dbg->elf) == ELFCLASS32 ) ? 4 : 8;
+ if (!regsize)
+ return -2;
+
+ /* Start with the function's type, and get the DW_AT_type attribute,
+ which is the type of the return value. */
+
+ Dwarf_Attribute attr_mem;
+ Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type, &attr_mem);
+ if (attr == NULL)
+ /* The function has no return value, like a `void' function in C. */
+ return 0;
+
+ Dwarf_Die die_mem;
+ Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
+ int tag = dwarf_tag (typedie);
+
+ /* Follow typedefs and qualifiers to get to the actual type. */
+ while (tag == DW_TAG_typedef
+ || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
+ || tag == DW_TAG_restrict_type)
+ {
+ attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+ typedie = dwarf_formref_die (attr, &die_mem);
+ tag = dwarf_tag (typedie);
+ }
+
+ switch (tag)
+ {
+ case -1:
+ return -1;
+
+ case DW_TAG_subrange_type:
+ if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
+ {
+ attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+ typedie = dwarf_formref_die (attr, &die_mem);
+ tag = dwarf_tag (typedie);
+ }
+ /* Fall through. */
+ FALLTHROUGH;
+
+ case DW_TAG_base_type:
+ case DW_TAG_enumeration_type:
+ CASE_POINTER:
+ {
+ Dwarf_Word size;
+ if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
+ &attr_mem), &size) != 0)
+ {
+ if (dwarf_is_pointer (tag))
+ size = regsize;
+ else
+ return -1;
+ }
+ if (tag == DW_TAG_base_type)
+ {
+ Dwarf_Word encoding;
+ if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
+ &attr_mem), &encoding) != 0)
+ return -1;
+
+#define ARCH_LOC(loc, regsize) ((regsize) == 4 ? (loc ## _o32) : (loc))
+
+ if (encoding == DW_ATE_float)
+ {
+ *locp = ARCH_LOC(loc_fpreg, regsize);
+ if (size <= regsize)
+ return nloc_fpreg;
+
+ if (size <= 2*regsize)
+ return nloc_fpregpair;
+
+ if (size <= 4*regsize)
+ return nloc_fpregquad;
+
+ goto aggregate;
+ }
+ }
+ *locp = ARCH_LOC(loc_intreg, regsize);
+ if (size <= regsize)
+ return nloc_intreg;
+ if (size <= 2*regsize)
+ return nloc_intregpair;
+
+ /* Else fall through. Shouldn't happen though (at least with gcc) */
+ }
+ FALLTHROUGH;
+
+ case DW_TAG_structure_type:
+ case DW_TAG_class_type:
+ case DW_TAG_union_type:
+ case DW_TAG_array_type:
+ aggregate:
+ *locp = loc_aggregate;
+ return nloc_aggregate;
+ case DW_TAG_unspecified_type:
+ return 0;
+ }
+
+ /* XXX We don't have a good way to return specific errors from ebl calls.
+ This value means we do not understand the type, but it is well-formed
+ DWARF and might be valid. */
+ return -2;
+}
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