py/nlrx64: Convert from assembler to C file with inline asm.

1 files changed, 129 insertions, 0 deletions

diff --git a/py/nlrx64.c b/py/nlrx64.c
new file mode 100644
index 000000000..845aac67a
--- /dev/null
+++ b/py/nlrx64.c
@@ -0,0 +1,129 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013-2017 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mpstate.h"
+#include "py/nlr.h"
+
+#if !MICROPY_NLR_SETJMP && defined(__x86_64__)
+
+#undef nlr_push
+
+// x86-64 callee-save registers are:
+//  rbx, rbp, rsp, r12, r13, r14, r15
+
+#define NLR_OS_WINDOWS (defined(_WIN32) || defined(__CYGWIN__))
+
+__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);
+
+unsigned int nlr_push(nlr_buf_t *nlr) {
+    (void)nlr;
+
+    #if NLR_OS_WINDOWS
+
+    __asm volatile (
+    "movq   (%rsp), %rax        \n" // load return %rip
+    "movq   %rax, 16(%rcx)      \n" // store %rip into nlr_buf
+    "movq   %rbp, 24(%rcx)      \n" // store %rbp into nlr_buf
+    "movq   %rsp, 32(%rcx)      \n" // store %rsp into nlr_buf
+    "movq   %rbx, 40(%rcx)      \n" // store %rbx into nlr_buf
+    "movq   %r12, 48(%rcx)      \n" // store %r12 into nlr_buf
+    "movq   %r13, 56(%rcx)      \n" // store %r13 into nlr_buf
+    "movq   %r14, 64(%rcx)      \n" // store %r14 into nlr_buf
+    "movq   %r15, 72(%rcx)      \n" // store %r15 into nlr_buf
+    "movq   %rdi, 80(%rcx)      \n" // store %rdr into nlr_buf
+    "movq   %rsi, 88(%rcx)      \n" // store %rsi into nlr_buf
+    "jmp    nlr_push_tail       \n" // do the rest in C
+    );
+
+    #else
+
+    __asm volatile (
+    "movq   (%rsp), %rax        \n" // load return %rip
+    "movq   %rax, 16(%rdi)      \n" // store %rip into nlr_buf
+    "movq   %rbp, 24(%rdi)      \n" // store %rbp into nlr_buf
+    "movq   %rsp, 32(%rdi)      \n" // store %rsp into nlr_buf
+    "movq   %rbx, 40(%rdi)      \n" // store %rbx into nlr_buf
+    "movq   %r12, 48(%rdi)      \n" // store %r12 into nlr_buf
+    "movq   %r13, 56(%rdi)      \n" // store %r13 into nlr_buf
+    "movq   %r14, 64(%rdi)      \n" // store %r14 into nlr_buf
+    "movq   %r15, 72(%rdi)      \n" // store %r15 into nlr_buf
+    "jmp    nlr_push_tail       \n" // do the rest in C
+    );
+
+    #endif
+
+    return 0; // needed to silence compiler warning
+}
+
+__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr) {
+    nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
+    nlr->prev = *top;
+    *top = nlr;
+    return 0; // normal return
+}
+
+void nlr_pop(void) {
+    nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
+    *top = (*top)->prev;
+}
+
+NORETURN void nlr_jump(void *val) {
+    nlr_buf_t **top_ptr = &MP_STATE_THREAD(nlr_top);
+    nlr_buf_t *top = *top_ptr;
+    if (top == NULL) {
+        nlr_jump_fail(val);
+    }
+
+    top->ret_val = val;
+    *top_ptr = top->prev;
+
+    __asm volatile (
+    "movq   %0, %%rcx           \n" // %rcx points to nlr_buf
+    #if NLR_OS_WINDOWS
+    "movq   88(%%rcx), %%rsi    \n" // load saved %rsi
+    "movq   80(%%rcx), %%rdi    \n" // load saved %rdr
+    #endif
+    "movq   72(%%rcx), %%r15    \n" // load saved %r15
+    "movq   64(%%rcx), %%r14    \n" // load saved %r14
+    "movq   56(%%rcx), %%r13    \n" // load saved %r13
+    "movq   48(%%rcx), %%r12    \n" // load saved %r12
+    "movq   40(%%rcx), %%rbx    \n" // load saved %rbx
+    "movq   32(%%rcx), %%rsp    \n" // load saved %rsp
+    "movq   24(%%rcx), %%rbp    \n" // load saved %rbp
+    "movq   16(%%rcx), %%rax    \n" // load saved %rip
+    "movq   %%rax, (%%rsp)      \n" // store saved %rip to stack
+    "xorq   %%rax, %%rax        \n" // clear return register
+    "inc    %%al                \n" // increase to make 1, non-local return
+    "ret                        \n" // return
+    :                               // output operands
+    : "r"(top)                      // input operands
+    :                               // clobbered registers
+    );
+
+    for (;;); // needed to silence compiler warning
+}
+
+#endif // !MICROPY_NLR_SETJMP && defined(__x86_64__)