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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2018-02-04 15:34:18 +0000
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2018-03-12 20:11:14 +0100
commit490e84f5e146485a26dea2f41279a4ff13aaca05 (patch)
tree03b9eab7297c5ad571b548b5ed916f17be78bf48 /libc/sysdeps/linux/tile/__longjmp.S
parent6e627523ee4b3fc00c30dcff74c2adf93e2b6840 (diff)
tile: add basic support for tilegx
This adds basic support for tile architecture. Only static binaries, no ld.so or threading support. Tested with qemu-tilegx only.
Diffstat (limited to 'libc/sysdeps/linux/tile/__longjmp.S')
-rw-r--r--libc/sysdeps/linux/tile/__longjmp.S54
1 files changed, 54 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/tile/__longjmp.S b/libc/sysdeps/linux/tile/__longjmp.S
new file mode 100644
index 000000000..08724db0a
--- /dev/null
+++ b/libc/sysdeps/linux/tile/__longjmp.S
@@ -0,0 +1,54 @@
+/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <jmpbuf-offsets.h>
+#include <arch/spr_def.h>
+
+/* PL to return to via iret in longjmp */
+#define RETURN_PL 0
+
+ .text
+ENTRY (__longjmp)
+
+#define RESTORE(r) { ld r, r0 ; ADDI_PTR r0, r0, REGSIZE }
+ FOR_EACH_CALLEE_SAVED_REG(RESTORE)
+
+ /* Make longjmp(buf, 0) return "1" instead.
+ At the same time, construct our iret context; we set ICS so
+ we can validly load EX_CONTEXT for iret without being
+ interrupted halfway through. */
+ {
+ ld r2, r0 /* retrieve ICS bit from jmp_buf */
+ movei r3, 1
+ cmpeqi r0, r1, 0
+ }
+ {
+ mtspr INTERRUPT_CRITICAL_SECTION, r3
+ shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT
+ }
+ {
+ mtspr EX_CONTEXT_0_0, lr
+ ori r2, r2, RETURN_PL
+ }
+ {
+ or r0, r1, r0
+ mtspr EX_CONTEXT_0_1, r2
+ }
+ iret
+ jrp lr /* Keep the backtracer happy. */
+END (__longjmp)
+libc_hidden_def(__longjmp)