1 /* Copyright (c) 2009-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "ContextRaw.hpp"
8 #include "simgrid/Exception.hpp"
9 #include "src/simix/smx_private.hpp"
11 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
13 // Raw context routines
15 using rawctx_entry_point_t = void (*)(simgrid::kernel::context::SwappedContext*);
17 using raw_stack_t = void*;
18 extern "C" raw_stack_t raw_makecontext(void* malloced_stack, int stack_size, rawctx_entry_point_t entry_point,
19 simgrid::kernel::context::SwappedContext* arg);
20 extern "C" void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context);
22 // TODO, we should handle FP, MMX and the x87 control-word (for x86 and x86_64)
24 #if SIMGRID_PROCESSOR_x86_64
26 #if defined(__APPLE__)
28 ".globl _raw_makecontext\n"
32 ".globl raw_makecontext\n"
36 ".globl raw_makecontext\n"
37 ".type raw_makecontext,@function\n"
38 "raw_makecontext:\n"/* Calling convention sets the arguments in rdi, rsi, rdx and rcx, respectively */
40 " mov %rdi,%rax\n" /* stack */
41 " add %rsi,%rax\n" /* size */
42 " andq $-16, %rax\n" /* align stack */
43 " movq $0, -8(%rax)\n" /* @return for func */
44 " mov %rdx,-16(%rax)\n" /* func */
45 " mov %rcx,-24(%rax)\n" /* arg/rdi */
46 " movq $0, -32(%rax)\n" /* rsi */
47 " movq $0, -40(%rax)\n" /* rdx */
48 " movq $0, -48(%rax)\n" /* rcx */
49 " movq $0, -56(%rax)\n" /* r8 */
50 " movq $0, -64(%rax)\n" /* r9 */
51 " movq $0, -72(%rax)\n" /* rbp */
52 " movq $0, -80(%rax)\n" /* rbx */
53 " movq $0, -88(%rax)\n" /* r12 */
54 " movq $0, -96(%rax)\n" /* r13 */
55 " movq $0, -104(%rax)\n" /* r14 */
56 " movq $0, -112(%rax)\n" /* r15 */
62 #if defined(__APPLE__)
64 ".globl _raw_swapcontext\n"
68 ".globl raw_swapcontext\n"
72 ".globl raw_swapcontext\n"
73 ".type raw_swapcontext,@function\n"
74 "raw_swapcontext:\n" /* Calling convention sets the arguments in rdi and rsi, respectively */
88 " mov %rsp,(%rdi)\n" /* old */
89 " mov %rsi,%rsp\n" /* new */
104 #elif SIMGRID_PROCESSOR_i686
106 #if defined(__APPLE__) || defined(_WIN32)
108 ".globl _raw_makecontext\n"
109 "_raw_makecontext:\n"
112 ".globl raw_makecontext\n"
113 ".type raw_makecontext,@function\n"
116 " movl 4(%esp),%eax\n" /* stack */
117 " addl 8(%esp),%eax\n" /* size */
118 " andl $-16, %eax\n" /* align stack */
119 " movl 12(%esp),%ecx\n" /* func */
120 " movl 16(%esp),%edx\n" /* arg */
121 " movl %edx, -4(%eax)\n"
122 " movl $0, -8(%eax)\n" /* @return for func */
123 " movl %ecx,-12(%eax)\n"
124 " movl $0, -16(%eax)\n" /* ebp */
125 " movl $0, -20(%eax)\n" /* ebx */
126 " movl $0, -24(%eax)\n" /* esi */
127 " movl $0, -28(%eax)\n" /* edi */
133 #if defined(__APPLE__) || defined(_WIN32)
135 ".globl _raw_swapcontext\n"
136 "_raw_swapcontext:\n"
139 ".globl raw_swapcontext\n"
140 ".type raw_swapcontext,@function\n"
143 // Fetch the parameters:
144 " movl 4(%esp),%eax\n" /* old (raw_stack_t*) */
145 " movl 8(%esp),%edx\n" /* new (raw_stack_t) */
146 // Save registers of the current context on the stack:
151 // Save the current context (stack pointer) in *old:
152 " movl %esp,(%eax)\n"
153 // Switch to the stack of the new context:
155 // Pop the values of the new context:
160 // Return using the return address of the new context:
166 /* If you implement raw contexts for other processors, don't forget to
167 update the definition of HAVE_RAW_CONTEXTS in tools/cmake/CompleteInFiles.cmake */
169 raw_stack_t raw_makecontext(void* malloced_stack, int stack_size, rawctx_entry_point_t entry_point,
170 simgrid::kernel::context::SwappedContext* arg)
175 void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context)
182 // ***** Method definitions
190 RawContext* RawContextFactory::create_context(std::function<void()>&& code, actor::ActorImpl* actor)
192 return this->new_context<RawContext>(std::move(code), actor, this);
197 RawContext::RawContext(std::function<void()>&& code, actor::ActorImpl* actor, SwappedContextFactory* factory)
198 : SwappedContext(std::move(code), actor, factory)
200 XBT_VERB("Creating a context of stack %uMb", actor->get_stacksize() / 1024 / 1024);
202 this->stack_top_ = raw_makecontext(get_stack(), actor->get_stacksize(), smx_ctx_wrapper, this);
205 MC_ignore_heap(&stack_top_, sizeof(stack_top_));
209 void RawContext::swap_into_for_real(SwappedContext* to_)
211 const RawContext* to = static_cast<RawContext*>(to_);
212 raw_swapcontext(&this->stack_top_, to->stack_top_);
215 ContextFactory* raw_factory()
217 XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
218 return new RawContextFactory();
220 } // namespace context
221 } // namespace kernel
222 } // namespace simgrid