diff options
Diffstat (limited to 'libgo/go/runtime/mkpreempt.go')
| -rw-r--r-- | libgo/go/runtime/mkpreempt.go | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/libgo/go/runtime/mkpreempt.go b/libgo/go/runtime/mkpreempt.go index 35ed42871f1..1fe77663b9c 100644 --- a/libgo/go/runtime/mkpreempt.go +++ b/libgo/go/runtime/mkpreempt.go @@ -502,8 +502,33 @@ func genPPC64() { } func genRISCV64() { - p("// No async preemption on riscv64 - see issue 36711") - p("UNDEF") + // X0 (zero), X1 (LR), X2 (SP), X4 (g), X31 (TMP) are special. + var l = layout{sp: "X2", stack: 8} + + // Add integer registers (X3, X5-X30). + for i := 3; i < 31; i++ { + if i == 4 { + continue + } + reg := fmt.Sprintf("X%d", i) + l.add("MOV", reg, 8) + } + + // Add floating point registers (F0-F31). + for i := 0; i <= 31; i++ { + reg := fmt.Sprintf("F%d", i) + l.add("MOVD", reg, 8) + } + + p("MOV X1, -%d(X2)", l.stack) + p("ADD $-%d, X2", l.stack) + l.save() + p("CALL ·asyncPreempt2(SB)") + l.restore() + p("MOV %d(X2), X1", l.stack) + p("MOV (X2), X31") + p("ADD $%d, X2", l.stack+8) + p("JMP (X31)") } func genS390X() { |