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https://github.com/RGBCube/serenity
synced 2025-07-03 05:32:13 +00:00
Kernel: Use C++ structured bindings to bind syscall parameters
Some syscalls have to pass parameters through a struct, since we can only fit 3 parameters with our calling convention. This patch makes use of C++ structured binding to clean up the places where we expand those parameters structs into local variables.
This commit is contained in:
parent
7e7451c427
commit
72fae05c07
2 changed files with 44 additions and 61 deletions
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@ -196,15 +196,11 @@ void* Process::sys$mmap(const Syscall::SC_mmap_params* params)
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{
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if (!validate_read(params, sizeof(Syscall::SC_mmap_params)))
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return (void*)-EFAULT;
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if (params->name && !validate_read_str(params->name))
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auto& [addr, size, prot, flags, fd, offset, name] = *params;
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if (name && !validate_read_str(name))
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return (void*)-EFAULT;
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void* addr = (void*)params->addr;
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size_t size = params->size;
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int prot = params->prot;
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int flags = params->flags;
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int fd = params->fd;
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off_t offset = params->offset;
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const char* name = params->name;
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if (size == 0)
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return (void*)-EINVAL;
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if ((u32)addr & ~PAGE_MASK)
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@ -1351,7 +1347,7 @@ int Process::sys$open(const Syscall::SC_open_params* params)
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{
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if (!validate_read_typed(params))
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return -EFAULT;
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auto [path, path_length, options, mode] = *params;
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auto& [path, path_length, options, mode] = *params;
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if (!validate_read(path, path_length))
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return -EFAULT;
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#ifdef DEBUG_IO
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@ -1376,7 +1372,7 @@ int Process::sys$openat(const Syscall::SC_openat_params* params)
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{
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if (!validate_read_typed(params))
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return -EFAULT;
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auto [dirfd, path, path_length, options, mode] = *params;
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auto& [dirfd, path, path_length, options, mode] = *params;
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if (!validate_read(path, path_length))
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return -EFAULT;
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#ifdef DEBUG_IO
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@ -2070,21 +2066,24 @@ int Process::sys$select(const Syscall::SC_select_params* params)
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// FIXME: Return -EINVAL if timeout is invalid.
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if (!validate_read_typed(params))
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return -EFAULT;
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if (params->writefds && !validate_write_typed(params->writefds))
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auto& [nfds, readfds, writefds, exceptfds, timeout] = *params;
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if (writefds && !validate_write_typed(writefds))
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return -EFAULT;
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if (params->readfds && !validate_write_typed(params->readfds))
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if (readfds && !validate_write_typed(readfds))
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return -EFAULT;
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if (params->exceptfds && !validate_write_typed(params->exceptfds))
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if (exceptfds && !validate_write_typed(exceptfds))
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return -EFAULT;
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if (params->timeout && !validate_read_typed(params->timeout))
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if (timeout && !validate_read_typed(timeout))
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return -EFAULT;
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if (params->nfds < 0)
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if (nfds < 0)
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return -EINVAL;
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timeval timeout;
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timeval computed_timeout;
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bool select_has_timeout = false;
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if (params->timeout && (params->timeout->tv_sec || params->timeout->tv_usec)) {
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timeval_add(kgettimeofday(), *params->timeout, timeout);
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if (timeout && (timeout->tv_sec || timeout->tv_usec)) {
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timeval_add(kgettimeofday(), *timeout, computed_timeout);
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select_has_timeout = true;
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}
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@ -2105,19 +2104,19 @@ int Process::sys$select(const Syscall::SC_select_params* params)
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}
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return 0;
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};
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if (int error = transfer_fds(params->writefds, wfds))
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if (int error = transfer_fds(writefds, wfds))
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return error;
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if (int error = transfer_fds(params->readfds, rfds))
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if (int error = transfer_fds(readfds, rfds))
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return error;
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if (int error = transfer_fds(params->exceptfds, efds))
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if (int error = transfer_fds(exceptfds, efds))
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return error;
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#if defined(DEBUG_IO) || defined(DEBUG_POLL_SELECT)
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dbgprintf("%s<%u> selecting on (read:%u, write:%u), timeout=%p\n", name().characters(), pid(), rfds.size(), wfds.size(), params->timeout);
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dbgprintf("%s<%u> selecting on (read:%u, write:%u), timeout=%p\n", name().characters(), pid(), rfds.size(), wfds.size(), timeout);
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#endif
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if (!params->timeout || select_has_timeout) {
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if (current->block<Thread::SelectBlocker>(timeout, select_has_timeout, rfds, wfds, efds) == Thread::BlockResult::InterruptedBySignal)
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if (!timeout || select_has_timeout) {
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if (current->block<Thread::SelectBlocker>(computed_timeout, select_has_timeout, rfds, wfds, efds) == Thread::BlockResult::InterruptedBySignal)
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return -EINTR;
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}
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@ -2133,9 +2132,9 @@ int Process::sys$select(const Syscall::SC_select_params* params)
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}
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}
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};
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mark_fds(params->readfds, rfds, [](auto& description) { return description.can_read(); });
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mark_fds(params->writefds, wfds, [](auto& description) { return description.can_write(); });
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// FIXME: We should also mark params->exceptfds as appropriate.
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mark_fds(readfds, rfds, [](auto& description) { return description.can_read(); });
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mark_fds(writefds, wfds, [](auto& description) { return description.can_write(); });
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// FIXME: We should also mark exceptfds as appropriate.
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return marked_fd_count;
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}
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@ -2465,12 +2464,7 @@ ssize_t Process::sys$sendto(const Syscall::SC_sendto_params* params)
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if (!validate_read_typed(params))
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return -EFAULT;
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int sockfd = params->sockfd;
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const void* data = params->data;
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size_t data_length = params->data_length;
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int flags = params->flags;
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auto* addr = (const sockaddr*)params->addr;
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auto addr_length = (socklen_t)params->addr_length;
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auto& [sockfd, data, data_length, flags, addr, addr_length] = *params;
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if (!validate_read(data, data_length))
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return -EFAULT;
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@ -2491,12 +2485,7 @@ ssize_t Process::sys$recvfrom(const Syscall::SC_recvfrom_params* params)
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if (!validate_read_typed(params))
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return -EFAULT;
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int sockfd = params->sockfd;
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void* buffer = params->buffer;
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size_t buffer_length = params->buffer_length;
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int flags = params->flags;
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auto* addr = (sockaddr*)params->addr;
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auto* addr_length = (socklen_t*)params->addr_length;
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auto& [sockfd, buffer, buffer_length, flags, addr, addr_length] = *params;
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if (!validate_write(buffer, buffer_length))
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return -EFAULT;
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@ -2627,11 +2616,8 @@ int Process::sys$getsockopt(const Syscall::SC_getsockopt_params* params)
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{
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if (!validate_read_typed(params))
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return -EFAULT;
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int sockfd = params->sockfd;
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int level = params->level;
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int option = params->option;
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auto* value = params->value;
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auto* value_size = (socklen_t*)params->value_size;
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auto& [sockfd, level, option, value, value_size] = *params;
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if (!validate_write_typed(value_size))
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return -EFAULT;
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@ -2650,11 +2636,8 @@ int Process::sys$setsockopt(const Syscall::SC_setsockopt_params* params)
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{
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if (!validate_read_typed(params))
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return -EFAULT;
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int sockfd = params->sockfd;
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int level = params->level;
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int option = params->option;
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auto* value = params->value;
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auto value_size = (socklen_t)params->value_size;
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auto& [sockfd, level, option, value, value_size] = *params;
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if (!validate_read(value, value_size))
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return -EFAULT;
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@ -3201,17 +3184,15 @@ int Process::sys$clock_nanosleep(const Syscall::SC_clock_nanosleep_params* param
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if (!validate_read_typed(params))
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return -EFAULT;
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if (params->requested_sleep && !validate_read_typed(params->requested_sleep))
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auto& [clock_id, flags, requested_sleep, remaining_sleep] = *params;
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if (requested_sleep && !validate_read_typed(requested_sleep))
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return -EFAULT;
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if (params->remaining_sleep && !validate_write_typed(params->remaining_sleep))
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if (remaining_sleep && !validate_write_typed(remaining_sleep))
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return -EFAULT;
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clockid_t clock_id = params->clock_id;
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int flags = params->flags;
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bool is_absolute = flags & TIMER_ABSTIME;
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auto* requested_sleep = params->requested_sleep;
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auto* remaining_sleep = params->remaining_sleep;
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switch (clock_id) {
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case CLOCK_MONOTONIC: {
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