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ASM_COPY_STACKS for aarch64 #16621

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May 28, 2016
Merged

ASM_COPY_STACKS for aarch64 #16621

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14 changes: 11 additions & 3 deletions src/task.c
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,7 @@ extern size_t jl_page_size;
jl_datatype_t *jl_task_type;

#ifdef COPY_STACKS
#if (defined(_CPU_X86_64_) || defined(_CPU_X86_)) && !defined(_COMPILER_MICROSOFT_)
#if (defined(_CPU_X86_64_) || defined(_CPU_X86_) || defined(_CPU_AARCH64_)) && !defined(_COMPILER_MICROSOFT_)
#define ASM_COPY_STACKS
#endif

Expand Down Expand Up @@ -324,6 +324,7 @@ static void ctx_switch(jl_tls_states_t *ptls, jl_task_t *t, jl_jmp_buf *where)
}
else {
#ifdef ASM_COPY_STACKS
// Start the task without `setjmp`
void *stackbase = ptls->stackbase;
#ifdef _CPU_X86_64_
#ifdef _OS_WINDOWS_
Expand All @@ -332,16 +333,23 @@ static void ctx_switch(jl_tls_states_t *ptls, jl_task_t *t, jl_jmp_buf *where)
asm(" movq %0, %%rsp;\n"
" xorq %%rbp, %%rbp;\n"
" push %%rbp;\n" // instead of RSP
" jmp %P1;\n" // call stack_task with fake stack frame
" jmp %P1;\n" // call `start_task` with fake stack frame
" ud2"
: : "r"(stackbase), "i"(&start_task) : "memory" );
#elif defined(_CPU_X86_)
asm(" movl %0, %%esp;\n"
" xorl %%ebp, %%ebp;\n"
" push %%ebp;\n" // instead of ESP
" jmp %P1;\n" // call stack_task with fake stack frame
" jmp %P1;\n" // call `start_task` with fake stack frame
" ud2"
: : "r" (stackbase), ""(&start_task) : "memory" );
#elif defined(_CPU_AARCH64_)
asm(" mov sp, %0;\n"
" mov x29, xzr;\n" // Clear link register (x29) and frame pointer
" mov x30, xzr;\n" // (x30) to terminate unwinder.
" br %1;\n" // call `start_task` with fake stack frame
" brk #0x1" // abort
: : "r" (stackbase), "r"(&start_task) : "memory" );
#else
#error ASM_COPY_STACKS not supported on this cpu architecture
#endif
Expand Down