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[kernel] Add capabilities to handles

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This change finally adds capabilities to handles. Included changes:

- j6_handle_t is now again 64 bits, with the highest 8 bits being a type
  code, and the next highest 24 bits being the capability mask, so that
  programs can check type/caps without calling the kernel.
- The definitions grammar now includes a `capabilities [ ]` section on
  objects, to list what capabilities are relevant.
- j6/caps.h is auto-generated from object capability lists
- init_libj6 again sets __handle_self and __handle_sys, this is a bit
  of a hack.
- A new syscall, j6_handle_list, will return the list of existing
  handles owned by the calling process.
- syscall_verify.cpp.cog now actually checks that the needed
  capabilities exist on handles before allowing the call.
This commit is contained in:
Justin C. Miller
2022-01-28 01:49:26 -08:00
parent 9b75acf0b5
commit f1246f84e0
38 changed files with 290 additions and 177 deletions
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18
src/user/drv.uart/main.cpp
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@@ -18,8 +18,8 @@ extern "C" {
int main(int, const char **);
}
constexpr j6_handle_t handle_self = 1;
constexpr j6_handle_t handle_sys = 2;
extern j6_handle_t __handle_self;
extern j6_handle_t __handle_sys;
struct entry
{
@@ -76,13 +76,13 @@ log_pump_proc()
void *message_buffer = nullptr;
char stringbuf[300];
j6_status_t result = j6_system_request_iopl(handle_sys, 3);
j6_status_t result = j6_system_request_iopl(__handle_sys, 3);
if (result != j6_status_ok)
return;
while (true) {
size_t size = buffer_size;
j6_status_t s = j6_system_get_log(handle_sys, message_buffer, &size);
j6_status_t s = j6_system_get_log(__handle_sys, message_buffer, &size);
if (s == j6_err_insufficient) {
free(message_buffer);
@@ -96,7 +96,7 @@ log_pump_proc()
if (size == 0) {
j6_signal_t sigs = 0;
j6_kobject_wait(handle_sys, j6_signal_system_has_log, &sigs);
j6_kobject_wait(__handle_sys, j6_signal_system_has_log, &sigs);
continue;
}
@@ -121,7 +121,7 @@ main(int argc, const char **argv)
j6_handle_t endp = j6_handle_invalid;
j6_status_t result = j6_status_ok;
result = j6_system_request_iopl(handle_sys, 3);
result = j6_system_request_iopl(__handle_sys, 3);
if (result != j6_status_ok)
return result;
@@ -129,11 +129,11 @@ main(int argc, const char **argv)
if (result != j6_status_ok)
return result;
result = j6_system_bind_irq(handle_sys, endp, 3);
result = j6_system_bind_irq(__handle_sys, endp, 3);
if (result != j6_status_ok)
return result;
result = j6_system_bind_irq(handle_sys, endp, 4);
result = j6_system_bind_irq(__handle_sys, endp, 4);
if (result != j6_status_ok)
return result;
@@ -153,7 +153,7 @@ main(int argc, const char **argv)
sp[0] = sp[1] = 0;
j6_handle_t child = j6_handle_invalid;
result = j6_thread_create(&child, handle_self, stack_top - 0x10, reinterpret_cast<uintptr_t>(&log_pump_proc));
result = j6_thread_create(&child, __handle_self, stack_top - 0x10, reinterpret_cast<uintptr_t>(&log_pump_proc));
if (result != j6_status_ok)
return result;