forked from M-Labs/libfringe
riscv32: env call on context switch
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@ -159,6 +159,12 @@ pub unsafe fn swap(arg: usize, new_sp: StackPointer,
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// Just pass a dummy pointer if we aren't linking the stack
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// Just pass a dummy pointer if we aren't linking the stack
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&mut dummy
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&mut dummy
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};
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};
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let stack_limit = if let Some(new_stack) = new_stack {
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new_stack.limit() as *mut usize
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} else {
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// Stack should not reach all the way to address 0
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0 as *mut usize
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};
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#[naked]
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#[naked]
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unsafe extern "C" fn trampoline() {
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unsafe extern "C" fn trampoline() {
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@ -174,6 +180,9 @@ pub unsafe fn swap(arg: usize, new_sp: StackPointer,
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.cfi_offset fp, 4
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.cfi_offset fp, 4
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.cfi_offset ra, 0
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.cfi_offset ra, 0
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# Perform environment call to modify the PMP regions
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ecall
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# Link the call stacks together by writing the current stack bottom
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# Link the call stacks together by writing the current stack bottom
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# address to the CFA slot in the new stack.
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# address to the CFA slot in the new stack.
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sw sp, 0(a3)
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sw sp, 0(a3)
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@ -209,6 +218,7 @@ pub unsafe fn swap(arg: usize, new_sp: StackPointer,
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"{a0}" (arg)
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"{a0}" (arg)
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"{a2}" (new_sp.0)
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"{a2}" (new_sp.0)
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"{a3}" (new_cfa)
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"{a3}" (new_cfa)
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"{a7}" (stack_limit)
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:/*"zero",*/"ra",/*"sp","gp","tp",*/"t0","t1","t2",
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:/*"zero",*/"ra",/*"sp","gp","tp",*/"t0","t1","t2",
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/*"fp",*/"s1",/*"a0", "a1"*/"a2", "a3", "a4", "a5",
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/*"fp",*/"s1",/*"a0", "a1"*/"a2", "a3", "a4", "a5",
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"a6", "a7", "s2", "s3", "s4", "s5", "s6", "s7",
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"a6", "a7", "s2", "s3", "s4", "s5", "s6", "s7",
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