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// Copyright 2019 The Marl Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#if defined(__powerpc64__)
#include "osfiber_asm_ppc64.h"
#include "marl/export.h"
MARL_EXPORT
void marl_fiber_trampoline(void (*target)(void*), void* arg) {
target(arg);
}
MARL_EXPORT
void marl_fiber_set_target(struct marl_fiber_context* ctx,
void* stack,
uint32_t stack_size,
void (*target)(void*),
void* arg) {
uintptr_t stack_top = (uintptr_t)((uint8_t*)(stack) + stack_size);
if ((stack_top % 16) != 0) {
stack_top -= (stack_top % 16);
}
// Write a backchain and subtract a minimum stack frame size (32)
*(uintptr_t*)stack_top = 0;
stack_top -= 32;
*(uintptr_t*)stack_top = stack_top + 32;
// Load registers
ctx->r1 = stack_top;
ctx->lr = (uintptr_t)marl_fiber_trampoline;
ctx->r3 = (uintptr_t)target;
ctx->r4 = (uintptr_t)arg;
// Thread pointer must be saved in r13
__asm__ volatile("mr %0, 13\n" : "=r"(ctx->r13));
}
#endif // __powerpc64__