zig

commit 7aaea20e7e5e98bc5b2c4c8ddcf8f6aaa4a9c55d (tree)
parent f6b1fa9e29ccab77a54e92dc13a7eb8e407bdbbc
Author: Koakuma <koachan@protonmail.com>
Date:   Fri, 30 Jul 2021 21:45:28 +0700

Add freeAndExit() implementation for Linux/SPARCv9

Diffstat:
M
lib/std/Thread.zig
 | 
26
++++++++++++++++++++++++++

1 file changed, 26 insertions(+), 0 deletions(-)
diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
@@ -798,6 +798,32 @@ const LinuxThreadImpl = struct {
                       [len] "r" (self.mapped.len)
                     : "memory"
                 ),
+                .sparcv9 => asm volatile (
+                    \\ # SPARCs really don't like it when active stack frames
+                    \\ # is unmapped (it will result in a segfault), so we
+                    \\ # force-deactivate it by running `restore` until
+                    \\ # all frames are cleared.
+                    \\  1:
+                    \\  cmp %%sp, 0
+                    \\  beq 2f
+                    \\  restore
+                    \\  ba 1f
+                    \\  2:
+                    \\  mov 73, %%g1
+                    \\  mov %[ptr], %%o0
+                    \\  mov %[len], %%o1
+                    \\  # Flush register window contents to prevent background
+                    \\  # memory access before unmapping the stack.
+                    \\  flushw
+                    \\  t 0x6d
+                    \\  mov 1, %%g1
+                    \\  mov 1, %%o0
+                    \\  t 0x6d
+                    :
+                    : [ptr] "r" (@ptrToInt(self.mapped.ptr)),
+                      [len] "r" (self.mapped.len)
+                    : "memory"
+                ),
                 else => |cpu_arch| @compileError("Unsupported linux arch: " ++ @tagName(cpu_arch)),
             }
             unreachable;