HostedPlatform.h

/*
 * Copyright (c) 2026, Pedigree Developers
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted.
 */
 
#ifndef PEDIGREE_KERNEL_PROCESSOR_HOSTED_PLATFORM_H
#define PEDIGREE_KERNEL_PROCESSOR_HOSTED_PLATFORM_H
#include <config.h>
#include <cstddef>
#include <cstdint>
#include <ucontext.h>
#include <unistd.h>
 
namespace HostedPlatform {
inline size_t pageSize() {
  const long result = sysconf(_SC_PAGESIZE);
  return result > 0 ? static_cast<size_t>(result) : 0;
}
 
template <class Context>
inline uintptr_t instructionPointer(const Context* context) {
#if defined(__APPLE__) && defined(__aarch64__)
  return context->uc_mcontext->__ss.__pc;
#elif defined(__APPLE__) && defined(__x86_64__)
  return context->uc_mcontext->__ss.__rip;
#elif defined(__linux__) && defined(__x86_64__)
  return context->uc_mcontext.gregs[REG_RIP];
#else
#error Unsupported hosted ucontext platform
#endif
}
 
template <class Context>
inline uintptr_t stackPointer(const Context* context) {
#if defined(__APPLE__) && defined(__aarch64__)
  return context->uc_mcontext->__ss.__sp;
#elif defined(__APPLE__) && defined(__x86_64__)
  return context->uc_mcontext->__ss.__rsp;
#elif defined(__linux__) && defined(__x86_64__)
  return context->uc_mcontext.gregs[REG_RSP];
#else
#error Unsupported hosted ucontext platform
#endif
}
 
template <class Context>
inline uintptr_t basePointer(const Context* context) {
#if defined(__APPLE__) && defined(__aarch64__)
  return context->uc_mcontext->__ss.__fp;
#elif defined(__APPLE__) && defined(__x86_64__)
  return context->uc_mcontext->__ss.__rbp;
#elif defined(__linux__) && defined(__x86_64__)
  return context->uc_mcontext.gregs[REG_RBP];
#else
#error Unsupported hosted ucontext platform
#endif
}
}  // namespace HostedPlatform
 
#endif