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comparison src/os_cpu/linux_x86/vm/os_linux_x86.cpp @ 52:75b0f3cb1943

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Merge
author dcubed
date Thu, 13 Mar 2008 14:17:48 -0700
parents e195fe4c40c7 485d403e94e1
children d1605aabd0a1
comparison
equal deleted inserted replaced
46:8b6e49187640 52:75b0f3cb1943
60 #define SPELL_REG_SP "esp" 60 #define SPELL_REG_SP "esp"
61 #define SPELL_REG_FP "ebp" 61 #define SPELL_REG_FP "ebp"
62 #endif // AMD64 62 #endif // AMD64
63 63
64 address os::current_stack_pointer() { 64 address os::current_stack_pointer() {
65 #ifdef SPARC_WORKS
66 register void *esp;
67 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp));
68 return (address) ((char*)esp + sizeof(long)*2);
69 #else
65 register void *esp __asm__ (SPELL_REG_SP); 70 register void *esp __asm__ (SPELL_REG_SP);
66 return (address) esp; 71 return (address) esp;
72 #endif
67 } 73 }
68 74
69 char* os::non_memory_address_word() { 75 char* os::non_memory_address_word() {
70 // Must never look like an address returned by reserve_memory, 76 // Must never look like an address returned by reserve_memory,
71 // even in its subfields (as defined by the CPU immediate fields, 77 // even in its subfields (as defined by the CPU immediate fields,
137 frame os::get_sender_for_C_frame(frame* fr) { 143 frame os::get_sender_for_C_frame(frame* fr) {
138 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 144 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
139 } 145 }
140 146
141 intptr_t* _get_previous_fp() { 147 intptr_t* _get_previous_fp() {
148 #ifdef SPARC_WORKS
149 register intptr_t **ebp;
150 __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp));
151 #else
142 register intptr_t **ebp __asm__ (SPELL_REG_FP); 152 register intptr_t **ebp __asm__ (SPELL_REG_FP);
153 #endif
143 return (intptr_t*) *ebp; // we want what it points to. 154 return (intptr_t*) *ebp; // we want what it points to.
144 } 155 }
145 156
146 157
147 frame os::current_frame() { 158 frame os::current_frame() {
558 // amd64: pthread on amd64 is always in floating stack mode 569 // amd64: pthread on amd64 is always in floating stack mode
559 bool os::Linux::supports_variable_stack_size() { return true; } 570 bool os::Linux::supports_variable_stack_size() { return true; }
560 #else 571 #else
561 size_t os::Linux::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; 572 size_t os::Linux::min_stack_allowed = (48 DEBUG_ONLY(+4))*K;
562 573
574 #ifdef __GNUC__
563 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) 575 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;})
576 #endif
564 577
565 // Test if pthread library can support variable thread stack size. LinuxThreads 578 // Test if pthread library can support variable thread stack size. LinuxThreads
566 // in fixed stack mode allocates 2M fixed slot for each thread. LinuxThreads 579 // in fixed stack mode allocates 2M fixed slot for each thread. LinuxThreads
567 // in floating stack mode and NPTL support variable stack size. 580 // in floating stack mode and NPTL support variable stack size.
568 bool os::Linux::supports_variable_stack_size() { 581 bool os::Linux::supports_variable_stack_size() {
589 // a native application that plays with %gs, we might see non-zero %gs 602 // a native application that plays with %gs, we might see non-zero %gs
590 // even LinuxThreads is running in fixed stack mode. As the result, we'll 603 // even LinuxThreads is running in fixed stack mode. As the result, we'll
591 // return true and skip _thread_safety_check(), so we may not be able to 604 // return true and skip _thread_safety_check(), so we may not be able to
592 // detect stack-heap collisions. But otherwise it's harmless. 605 // detect stack-heap collisions. But otherwise it's harmless.
593 // 606 //
607 #ifdef __GNUC__
594 return (GET_GS() != 0); 608 return (GET_GS() != 0);
609 #else
610 return false;
611 #endif
595 } 612 }
596 } 613 }
597 #endif // AMD64 614 #endif // AMD64
598 615
599 // return default stack size for thr_type 616 // return default stack size for thr_type