RISC-V: Add setjmp implementation

This patch adds a 32/64 capable setjmp implementation for RISC-V.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/lib/riscv/setjmp.S b/grub-core/lib/riscv/setjmp.S
new file mode 100644 (file)
index 0000000..b48ef29
--- /dev/null
+++ b/grub-core/lib/riscv/setjmp.S
@@ -0,0 +1,84 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+#include <grub/dl.h>
+
+       .file   "setjmp.S"
+
+GRUB_MOD_LICENSE "GPLv3+"
+
+       .text
+
+#if __riscv_xlen == 64
+#define STORE_IDX(reg, idx)     sd reg, (idx*8)(a0)
+#define LOAD_IDX(reg, idx)      ld reg, (idx*8)(a0)
+#else
+#define STORE_IDX(reg, idx)     sw reg, (idx*4)(a0)
+#define LOAD_IDX(reg, idx)      lw reg, (idx*4)(a0)
+#endif
+
+/*
+ * int grub_setjmp (grub_jmp_buf env)
+ */
+FUNCTION(grub_setjmp)
+        /* Preserve all callee-saved registers and the SP */
+        STORE_IDX(s0, 0)
+        STORE_IDX(s1, 1)
+        STORE_IDX(s2, 2)
+        STORE_IDX(s3, 3)
+        STORE_IDX(s4, 4)
+        STORE_IDX(s5, 5)
+        STORE_IDX(s6, 6)
+        STORE_IDX(s7, 7)
+        STORE_IDX(s8, 8)
+        STORE_IDX(s9, 9)
+        STORE_IDX(s10, 10)
+        STORE_IDX(s11, 11)
+        STORE_IDX(ra, 12)
+        STORE_IDX(sp, 13)
+        li  a0, 0
+        ret
+
+/*
+ * int grub_longjmp (grub_jmp_buf env, int val)
+ */
+FUNCTION(grub_longjmp)
+        LOAD_IDX(s0, 0)
+        LOAD_IDX(s1, 1)
+        LOAD_IDX(s2, 2)
+        LOAD_IDX(s3, 3)
+        LOAD_IDX(s4, 4)
+        LOAD_IDX(s5, 5)
+        LOAD_IDX(s6, 6)
+        LOAD_IDX(s7, 7)
+        LOAD_IDX(s8, 8)
+        LOAD_IDX(s9, 9)
+        LOAD_IDX(s10, 10)
+        LOAD_IDX(s11, 11)
+        LOAD_IDX(ra, 12)
+        LOAD_IDX(sp, 13)
+
+        /* Move the return value in place, but return 1 if passed 0. */
+        beq a1, zero, longjmp_1
+        mv a0, a1
+        ret
+
+        longjmp_1:
+        li a0, 1
+        ret

diff --git a/include/grub/riscv32/setjmp.h b/include/grub/riscv32/setjmp.h
new file mode 100644 (file)
index 0000000..5a21238
--- /dev/null
+++ b/include/grub/riscv32/setjmp.h
@@ -0,0 +1,27 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_SETJMP_CPU_HEADER
+#define GRUB_SETJMP_CPU_HEADER 1
+
+typedef unsigned long long grub_jmp_buf[14];
+
+int grub_setjmp (grub_jmp_buf env) RETURNS_TWICE;
+void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
+
+#endif /* ! GRUB_SETJMP_CPU_HEADER */

diff --git a/include/grub/riscv64/setjmp.h b/include/grub/riscv64/setjmp.h
new file mode 100644 (file)
index 0000000..5a21238
--- /dev/null
+++ b/include/grub/riscv64/setjmp.h
@@ -0,0 +1,27 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_SETJMP_CPU_HEADER
+#define GRUB_SETJMP_CPU_HEADER 1
+
+typedef unsigned long long grub_jmp_buf[14];
+
+int grub_setjmp (grub_jmp_buf env) RETURNS_TWICE;
+void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
+
+#endif /* ! GRUB_SETJMP_CPU_HEADER */