This patch implements the set_initial_registers_tid hook for LoongArch.
Signed-off-by: Liwei Ge <geli...@openanolis.org>
Signed-off-by: Youling Tang <tangyoul...@loongson.cn>
---
backends/ChangeLog | 6 +++
backends/Makefile.am | 2 +-
backends/loongarch_init.c | 1 +
backends/loongarch_initreg.c | 91 ++++++++++++++++++++++++++++++++++++
4 files changed, 99 insertions(+), 1 deletion(-)
create mode 100644 backends/loongarch_initreg.c
diff --git a/backends/ChangeLog b/backends/ChangeLog
index 926c76ed..85abc8a5 100644
--- a/backends/ChangeLog
+++ b/backends/ChangeLog
@@ -1,3 +1,9 @@
+2023-04-07 Youling Tang <tangyoul...@loongson.cn>
+
+ * Makefile.am (loongarch_SRCS): Add loongarch_initreg.c.
+ * loongarch_initreg.c: New file.
+ * loongarch_init.c (loongarch_init): Hook set_initial_registers_tid.
+
2023-04-07 Youling Tang <tangyoul...@loongson.cn>
* Makefile.am (loongarch_SRCS): Add loongarch_cfi.c and
loongarch_regs.c.
diff --git a/backends/Makefile.am b/backends/Makefile.am
index 2b6f08ce..e7055d7e 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -97,7 +97,7 @@ csky_SRCS = csky_attrs.c csky_init.c csky_symbol.c csky_cfi.c
\
csky_regs.c csky_initreg.c csky_corenote.c
loongarch_SRCS = loongarch_init.c loongarch_symbol.c loongarch_cfi.c \
- loongarch_regs.c
+ loongarch_regs.c loongarch_initreg.c
arc_SRCS = arc_init.c arc_symbol.c
diff --git a/backends/loongarch_init.c b/backends/loongarch_init.c
index 7bfaaa7f..9c4b94a0 100644
--- a/backends/loongarch_init.c
+++ b/backends/loongarch_init.c
@@ -51,6 +51,7 @@ loongarch_init (Elf *elf __attribute__ ((unused)),
/* gcc/config/ #define DWARF_FRAME_REGISTERS. */
eh->frame_nregs = 74;
HOOK (eh, check_special_symbol);
+ HOOK (eh, set_initial_registers_tid);
return eh;
}
diff --git a/backends/loongarch_initreg.c b/backends/loongarch_initreg.c
new file mode 100644
index 00000000..75497a51
--- /dev/null
+++ b/backends/loongarch_initreg.c
@@ -0,0 +1,91 @@
+/* Fetch live process registers from TID.
+ Copyright (C) 2023 OpenAnolis community LoongArch SIG.
+ Copyright (C) 2023 Loongson Technology Corporation Limted.
+ 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 "system.h"
+#include <assert.h>
+#if defined __loongarch__ && defined __linux__
+# include <sys/uio.h>
+# include <sys/procfs.h>
+# include <sys/ptrace.h>
+#endif
+
+#define BACKEND loongarch_
+#include "libebl_CPU.h"
+
+bool
+loongarch_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
+ ebl_tid_registers_t *setfunc __attribute__
((unused)),
+ void *arg __attribute__ ((unused)))
+{
+#if !defined __loongarch__ || !defined __linux__
+ return false;
+#else /* __loongarch__ */
+
+ /* General registers. */
+ struct user_regs_struct gregs;
+ struct iovec iovec;
+ iovec.iov_base = &gregs;
+ iovec.iov_len = sizeof (gregs);
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
+ return false;
+
+ /* $r0 is constant 0. */
+ Dwarf_Word zero = 0;
+ if (! setfunc (0, 1, &zero, arg))
+ return false;
+
+ /* $r1-$r31. */
+ if (! setfunc (1, 32, (Dwarf_Word *) &gregs.regs[1], arg))
+ return false;
+
+ /* PC. */
+ if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.csr_era, arg))
+ return false;
+
+ /* Floating-point registers (only 64bits are used). */
+ struct user_fp_struct fregs;
+ iovec.iov_base = &fregs;
+ iovec.iov_len = sizeof (fregs);
+ if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0)
+ return false;
+
+ Dwarf_Word dwarf_fregs[32];
+ for (int r = 0; r < 32; r++)
+ dwarf_fregs[r] = fregs.fpr[r] & 0xFFFFFFFF;
+
+ if (! setfunc (32, 32, dwarf_fregs, arg))
+ return false;
+
+ return true;
+#endif /* __loongarch__ */
+}
--
2.37.1
