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authorsamuel <samuel@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-11-20 10:13:59 +0000
committersamuel <samuel@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-11-20 10:13:59 +0000
commit3e9beaf72b6b3a74acf764df4d801bb6371b6bca (patch)
tree7291a3fa8d1015a6141ec2d5dea530351c919edb /coroutine/x86
parentff86d1b61b62c710790cfca225303327745923f6 (diff)
Initial effort to support 32-bit Linux.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65847 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'coroutine/x86')
-rw-r--r--coroutine/x86/Context.h61
-rw-r--r--coroutine/x86/Context.s39
2 files changed, 100 insertions, 0 deletions
diff --git a/coroutine/x86/Context.h b/coroutine/x86/Context.h
new file mode 100644
index 0000000000..bbc60e4ff9
--- /dev/null
+++ b/coroutine/x86/Context.h
@@ -0,0 +1,61 @@
+//
+// File file is part of the "Coroutine" project and released under the MIT License.
+//
+// Created by Samuel Williams on 3/11/2018.
+// Copyright, 2018, by Samuel Williams. All rights reserved.
+//
+
+#pragma once
+
+#include <assert.h>
+#include <string.h>
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#define COROUTINE void __attribute__((fastcall))
+
+const size_t COROUTINE_REGISTERS = 4;
+
+// The fiber context (stack pointer).
+typedef struct
+{
+ void **stack_pointer;
+} coroutine_context;
+
+// The initialization function.
+typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self) __attribute__((fastcall));
+
+void coroutine_initialize(
+ coroutine_context *context,
+ coroutine_start start,
+ void *stack_pointer,
+ size_t stack_size
+) {
+ /* Force 16-byte alignment */
+ context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF);
+
+ if (!start) {
+ assert(!context->stack_pointer);
+ /* We are main coroutine for this thread */
+ return;
+ }
+
+ *--context->stack_pointer = NULL;
+ *--context->stack_pointer = (void*)start;
+
+ context->stack_pointer -= COROUTINE_REGISTERS;
+ memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
+}
+
+coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target) __attribute__((fastcall));
+
+inline void coroutine_destroy(coroutine_context * context)
+{
+ context->stack_pointer = NULL;
+}
+
+#if __cplusplus
+}
+#endif
diff --git a/coroutine/x86/Context.s b/coroutine/x86/Context.s
new file mode 100644
index 0000000000..9b319cd8df
--- /dev/null
+++ b/coroutine/x86/Context.s
@@ -0,0 +1,39 @@
+##
+## File file is part of the "Coroutine" project and released under the MIT License.
+##
+## Created by Samuel Williams on 3/11/2018.
+## Copyright, 2018, by Samuel Williams. All rights reserved.
+##
+
+.text
+
+.globl coroutine_transfer
+coroutine_transfer:
+
+# For older linkers
+.globl _coroutine_transfer
+_coroutine_transfer:
+
+ # Save caller registers
+ pushl %ebp
+ pushl %ebx
+ pushl %edi
+ pushl %esi
+
+ # Save caller stack pointer
+ movl %esp, (%ecx)
+
+ # Restore callee stack pointer
+ movl (%edx), %esp
+
+ # Restore callee stack
+ popl %esi
+ popl %edi
+ popl %ebx
+ popl %ebp
+
+ # Save the first argument as the return value
+ movl %ecx, %eax
+
+ # Jump to the address on the stack
+ ret