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UserspaceEmulator: Add the getrandom() syscall

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This commit is contained in:
Andreas Kling 2020-07-15 23:44:51 +02:00
parent 1873b8f3e4
commit 33e3e8d63d
2 changed files with 14 additions and 3 deletions
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16
DevTools/UserspaceEmulator/Emulator.cpp
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@ -198,9 +198,6 @@ void Emulator::dump_backtrace()
u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
{
(void)arg2;
(void)arg3;
#ifdef DEBUG_SPAM
dbgprintf("Syscall: %s (%x)\n", Syscall::to_string((Syscall::Function)function), function);
#endif
@ -296,6 +293,9 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$gettimeofday(arg1);
case SC_clock_gettime:
return virt$clock_gettime(arg1, arg2);
case SC_getrandom:
return virt$getrandom(arg1, arg2, arg3) ;
default:
warn() << "Unimplemented syscall: " << Syscall::to_string((Syscall::Function)function);
dump_backtrace();
@ -738,4 +738,14 @@ void Emulator::virt$exit(int status)
m_shutdown = true;
}
ssize_t Emulator::virt$getrandom(FlatPtr buffer, size_t buffer_size, unsigned int flags)
{
auto host_buffer = ByteBuffer::create_uninitialized(buffer_size);
int rc = syscall(SC_getrandom, host_buffer.data(), host_buffer.size(), flags);
if (rc < 0)
return rc;
mmu().copy_to_vm(buffer, host_buffer.data(), host_buffer.size());
return rc;
}
}

1
DevTools/UserspaceEmulator/Emulator.h
View file

@ -111,6 +111,7 @@ private:
int virt$recvfrom(FlatPtr);
int virt$connect(int sockfd, FlatPtr address, socklen_t address_size);
void virt$exit(int);
ssize_t virt$getrandom(FlatPtr buffer, size_t buffer_size, unsigned int flags);
FlatPtr allocate_vm(size_t size, size_t alignment);