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-rw-r--r--src/runtime/cgo/gcc_mips64x.S89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_mips64x.S b/src/runtime/cgo/gcc_mips64x.S
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+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build mips64 || mips64le
+
+.file "gcc_mips64x.S"
+
+/*
+ * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
+ *
+ * Calling into the gc tool chain, where all registers are caller save.
+ * Called from standard MIPS N64 ABI, where $16-$23, $28, $30, and $f24-$f31
+ * are callee-save, so they must be saved explicitly, along with $31 (LR).
+ */
+.globl crosscall1
+.set noat
+crosscall1:
+#ifndef __mips_soft_float
+ daddiu $29, $29, -160
+#else
+ daddiu $29, $29, -96 // For soft-float, no need to make room for FP registers
+#endif
+ sd $31, 0($29)
+ sd $16, 8($29)
+ sd $17, 16($29)
+ sd $18, 24($29)
+ sd $19, 32($29)
+ sd $20, 40($29)
+ sd $21, 48($29)
+ sd $22, 56($29)
+ sd $23, 64($29)
+ sd $28, 72($29)
+ sd $30, 80($29)
+#ifndef __mips_soft_float
+ sdc1 $f24, 88($29)
+ sdc1 $f25, 96($29)
+ sdc1 $f26, 104($29)
+ sdc1 $f27, 112($29)
+ sdc1 $f28, 120($29)
+ sdc1 $f29, 128($29)
+ sdc1 $f30, 136($29)
+ sdc1 $f31, 144($29)
+#endif
+
+ // prepare SB register = pc & 0xffffffff00000000
+ bal 1f
+1:
+ dsrl $28, $31, 32
+ dsll $28, $28, 32
+
+ move $20, $4 // save R4
+ move $1, $6
+ jalr $5 // call setg_gcc (clobbers R4)
+ jalr $20 // call fn
+
+ ld $16, 8($29)
+ ld $17, 16($29)
+ ld $18, 24($29)
+ ld $19, 32($29)
+ ld $20, 40($29)
+ ld $21, 48($29)
+ ld $22, 56($29)
+ ld $23, 64($29)
+ ld $28, 72($29)
+ ld $30, 80($29)
+#ifndef __mips_soft_float
+ ldc1 $f24, 88($29)
+ ldc1 $f25, 96($29)
+ ldc1 $f26, 104($29)
+ ldc1 $f27, 112($29)
+ ldc1 $f28, 120($29)
+ ldc1 $f29, 128($29)
+ ldc1 $f30, 136($29)
+ ldc1 $f31, 144($29)
+#endif
+ ld $31, 0($29)
+#ifndef __mips_soft_float
+ daddiu $29, $29, 160
+#else
+ daddiu $29, $29, 96
+#endif
+ jr $31
+
+.set at
+
+#ifdef __ELF__
+.section .note.GNU-stack,"",%progbits
+#endif