1 /*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2013-2017 Damien P. George
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #include "py/mpstate.h"
28
29 #if MICROPY_NLR_X64
30
31 #undef nlr_push
32
33 // x86-64 callee-save registers are:
34 // rbx, rbp, rsp, r12, r13, r14, r15
35
36 __attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);
37
nlr_push(nlr_buf_t * nlr)38 unsigned int nlr_push(nlr_buf_t *nlr) {
39 (void)nlr;
40
41 #if MICROPY_NLR_OS_WINDOWS
42
43 __asm volatile (
44 "movq (%rsp), %rax \n" // load return %rip
45 "movq %rax, 16(%rcx) \n" // store %rip into nlr_buf
46 "movq %rbp, 24(%rcx) \n" // store %rbp into nlr_buf
47 "movq %rsp, 32(%rcx) \n" // store %rsp into nlr_buf
48 "movq %rbx, 40(%rcx) \n" // store %rbx into nlr_buf
49 "movq %r12, 48(%rcx) \n" // store %r12 into nlr_buf
50 "movq %r13, 56(%rcx) \n" // store %r13 into nlr_buf
51 "movq %r14, 64(%rcx) \n" // store %r14 into nlr_buf
52 "movq %r15, 72(%rcx) \n" // store %r15 into nlr_buf
53 "movq %rdi, 80(%rcx) \n" // store %rdr into nlr_buf
54 "movq %rsi, 88(%rcx) \n" // store %rsi into nlr_buf
55 "jmp nlr_push_tail \n" // do the rest in C
56 );
57
58 #else
59
60 __asm volatile (
61 #if defined(__APPLE__) && defined(__MACH__)
62 "pop %rbp \n" // undo function's prelude
63 #endif
64 "movq (%rsp), %rax \n" // load return %rip
65 "movq %rax, 16(%rdi) \n" // store %rip into nlr_buf
66 "movq %rbp, 24(%rdi) \n" // store %rbp into nlr_buf
67 "movq %rsp, 32(%rdi) \n" // store %rsp into nlr_buf
68 "movq %rbx, 40(%rdi) \n" // store %rbx into nlr_buf
69 "movq %r12, 48(%rdi) \n" // store %r12 into nlr_buf
70 "movq %r13, 56(%rdi) \n" // store %r13 into nlr_buf
71 "movq %r14, 64(%rdi) \n" // store %r14 into nlr_buf
72 "movq %r15, 72(%rdi) \n" // store %r15 into nlr_buf
73 #if defined(__APPLE__) && defined(__MACH__)
74 "jmp _nlr_push_tail \n" // do the rest in C
75 #else
76 "jmp nlr_push_tail \n" // do the rest in C
77 #endif
78 );
79
80 #endif
81
82 return 0; // needed to silence compiler warning
83 }
84
nlr_jump(void * val)85 NORETURN void nlr_jump(void *val) {
86 MP_NLR_JUMP_HEAD(val, top)
87
88 __asm volatile (
89 "movq %0, %%rcx \n" // %rcx points to nlr_buf
90 #if MICROPY_NLR_OS_WINDOWS
91 "movq 88(%%rcx), %%rsi \n" // load saved %rsi
92 "movq 80(%%rcx), %%rdi \n" // load saved %rdi
93 #endif
94 "movq 72(%%rcx), %%r15 \n" // load saved %r15
95 "movq 64(%%rcx), %%r14 \n" // load saved %r14
96 "movq 56(%%rcx), %%r13 \n" // load saved %r13
97 "movq 48(%%rcx), %%r12 \n" // load saved %r12
98 "movq 40(%%rcx), %%rbx \n" // load saved %rbx
99 "movq 32(%%rcx), %%rsp \n" // load saved %rsp
100 "movq 24(%%rcx), %%rbp \n" // load saved %rbp
101 "movq 16(%%rcx), %%rax \n" // load saved %rip
102 "movq %%rax, (%%rsp) \n" // store saved %rip to stack
103 "xorq %%rax, %%rax \n" // clear return register
104 "inc %%al \n" // increase to make 1, non-local return
105 "ret \n" // return
106 : // output operands
107 : "r" (top) // input operands
108 : // clobbered registers
109 );
110
111 MP_UNREACHABLE
112 }
113
114 #endif // MICROPY_NLR_X64
115