1 /* Copyright (c) 2009-2022. 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"
10 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(ker_context);
12 // Raw context routines
14 using rawctx_entry_point_t = void (*)(simgrid::kernel::context::SwappedContext*);
16 using raw_stack_t = void*;
17 extern "C" raw_stack_t raw_makecontext(void* malloced_stack, int stack_size, rawctx_entry_point_t entry_point,
18 simgrid::kernel::context::SwappedContext* arg);
19 extern "C" void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context);
21 // TODO, we should handle FP, MMX and the x87 control-word (for x86 and x86_64)
25 #if SIMGRID_PROCESSOR_x86_64
27 #if defined(__APPLE__)
29 ".globl _raw_makecontext\n"
33 ".globl raw_makecontext\n"
37 ".globl raw_makecontext\n"
38 ".type raw_makecontext,@function\n"
39 "raw_makecontext:\n"/* Calling convention sets the arguments in rdi, rsi, rdx and rcx, respectively */
41 " mov %rdi,%rax\n" /* stack */
42 " add %rsi,%rax\n" /* size */
43 " andq $-16, %rax\n" /* align stack */
44 " movq $0, -8(%rax)\n" /* @return for func */
45 " mov %rdx,-16(%rax)\n" /* func */
46 " mov %rcx,-24(%rax)\n" /* arg/rdi */
47 " movq $0, -32(%rax)\n" /* rsi */
48 " movq $0, -40(%rax)\n" /* rdx */
49 " movq $0, -48(%rax)\n" /* rcx */
50 " movq $0, -56(%rax)\n" /* r8 */
51 " movq $0, -64(%rax)\n" /* r9 */
52 " movq $0, -72(%rax)\n" /* rbp */
53 " movq $0, -80(%rax)\n" /* rbx */
54 " movq $0, -88(%rax)\n" /* r12 */
55 " movq $0, -96(%rax)\n" /* r13 */
56 " movq $0, -104(%rax)\n" /* r14 */
57 " movq $0, -112(%rax)\n" /* r15 */
63 #if defined(__APPLE__)
65 ".globl _raw_swapcontext\n"
69 ".globl raw_swapcontext\n"
73 ".globl raw_swapcontext\n"
74 ".type raw_swapcontext,@function\n"
75 "raw_swapcontext:\n" /* Calling convention sets the arguments in rdi and rsi, respectively */
89 " mov %rsp,(%rdi)\n" /* old */
90 " mov %rsi,%rsp\n" /* new */
105 #elif SIMGRID_PROCESSOR_i686
107 #if defined(__APPLE__) || defined(_WIN32)
109 ".globl _raw_makecontext\n"
110 "_raw_makecontext:\n"
113 ".globl raw_makecontext\n"
114 ".type raw_makecontext,@function\n"
117 " movl 4(%esp),%eax\n" /* stack */
118 " addl 8(%esp),%eax\n" /* size */
119 " andl $-16, %eax\n" /* align stack */
120 " movl 12(%esp),%ecx\n" /* func */
121 " movl 16(%esp),%edx\n" /* arg */
122 " movl %edx, -4(%eax)\n"
123 " movl $0, -8(%eax)\n" /* @return for func */
124 " movl %ecx,-12(%eax)\n"
125 " movl $0, -16(%eax)\n" /* ebp */
126 " movl $0, -20(%eax)\n" /* ebx */
127 " movl $0, -24(%eax)\n" /* esi */
128 " movl $0, -28(%eax)\n" /* edi */
134 #if defined(__APPLE__) || defined(_WIN32)
136 ".globl _raw_swapcontext\n"
137 "_raw_swapcontext:\n"
140 ".globl raw_swapcontext\n"
141 ".type raw_swapcontext,@function\n"
144 // Fetch the parameters:
145 " movl 4(%esp),%eax\n" /* old (raw_stack_t*) */
146 " movl 8(%esp),%edx\n" /* new (raw_stack_t) */
147 // Save registers of the current context on the stack:
152 // Save the current context (stack pointer) in *old:
153 " movl %esp,(%eax)\n"
154 // Switch to the stack of the new context:
156 // Pop the values of the new context:
161 // Return using the return address of the new context:
165 #error HAVE_RAW_CONTEXTS defined, but neither SIMGRID_PROCESSOR_x86_64 nor SIMGRID_PROCESSOR_i686. Please update the code.
168 #else /* not HAVE_RAW_CONTEXTS */
170 /* If you implement raw contexts for other processors, don't forget to
171 update the definition of HAVE_RAW_CONTEXTS in tools/cmake/CompleteInFiles.cmake */
173 raw_stack_t raw_makecontext(void* malloced_stack, int stack_size, rawctx_entry_point_t entry_point,
174 simgrid::kernel::context::SwappedContext* arg)
179 void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context)
186 // ***** Method definitions
194 RawContext* RawContextFactory::create_context(std::function<void()>&& code, actor::ActorImpl* actor)
196 return this->new_context<RawContext>(std::move(code), actor, this);
201 RawContext::RawContext(std::function<void()>&& code, actor::ActorImpl* actor, SwappedContextFactory* factory)
202 : SwappedContext(std::move(code), actor, factory)
204 XBT_VERB("Creating a context of stack %uMb", actor->get_stacksize() / 1024 / 1024);
206 this->stack_top_ = raw_makecontext(get_stack(), actor->get_stacksize(), smx_ctx_wrapper, this);
209 MC_ignore_heap(&stack_top_, sizeof stack_top_);
213 void RawContext::swap_into_for_real(SwappedContext* to_)
215 const RawContext* to = static_cast<RawContext*>(to_);
216 raw_swapcontext(&this->stack_top_, to->stack_top_);
219 ContextFactory* raw_factory()
221 XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
222 return new RawContextFactory();
224 } // namespace context
225 } // namespace kernel
226 } // namespace simgrid