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kernel/syscalls: Implement sys_prctl syscall

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2 2024-12-25 04:47:26 +02:00
parent cc6ec04814
commit b471645743
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2 changed files with 86 additions and 0 deletions
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29
Kernel/include/interface/syscalls.h
View File

@ -215,6 +215,14 @@ typedef enum
__SYS_X_OK = 3
} access_flags_t;
typedef enum
{
__SYS_GET_GS = 0,
__SYS_SET_GS = 1,
__SYS_GET_FS = 2,
__SYS_SET_FS = 3,
} prctl_options_t;
typedef int __SYS_clockid_t;
typedef unsigned int __SYS_socklen_t;
@ -644,6 +652,27 @@ typedef enum
* - #EINVAL if `sig` is invalid
*/
SYS_KILL,
/**
* @brief Process/Thread Control
*
* @code
* int prctl(prctl_options_t option, unsigned long arg1, unsigned long arg2, unsigned long arg3, unsigned long arg4);
* @endcode
*
* @details Perform various operations on a process or thread.
*
* @param option Operation to perform
* @param arg1 Argument 1
* @param arg2 Argument 2
* @param arg3 Argument 3
* @param arg4 Argument 4
*
* @return
* - #EOK on success
* - #EINVAL if the operation is invalid
* - #EFAULT if one of the arguments is invalid
*/
SYS_PRCTL,
/* Memory */

57
Kernel/syscalls/native.cpp
View File

@ -184,6 +184,62 @@ static pid_t sys_getppid(SysFrm *Frame) { return -ENOSYS; }
static pid_t sys_waitpid(pid_t pid, int *wstatus, int options) { return -ENOSYS; }
static int sys_kill(SysFrm *Frame, pid_t pid, int sig) { return -ENOSYS; }
static int sys_prctl(SysFrm *Frame, prctl_options_t option, unsigned long arg1, unsigned long arg2, unsigned long arg3, unsigned long arg4)
{
PCB *pcb = thisProcess;
Memory::VirtualMemoryArea *vma = pcb->vma;
switch (option)
{
case __SYS_GET_GS:
{
auto arg = vma->UserCheckAndGetAddress((void *)arg1);
if (arg == nullptr)
return -EFAULT;
#if defined(__amd64__)
*r_cst(uintptr_t *, arg) = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_GS_BASE);
#elif defined(__i386__)
*r_cst(uintptr_t *, arg) = CPU::x32::rdmsr(CPU::x32::MSRID::MSR_GS_BASE);
#endif
return 0;
}
case __SYS_SET_GS:
{
#if defined(__amd64__)
CPU::x64::wrmsr(CPU::x64::MSRID::MSR_GS_BASE, arg1);
#elif defined(__i386__)
CPU::x32::wrmsr(CPU::x32::MSRID::MSR_GS_BASE, arg1);
#endif
return 0;
}
case __SYS_GET_FS:
{
auto arg = vma->UserCheckAndGetAddress((void *)arg1);
if (arg == nullptr)
return -EFAULT;
#if defined(__amd64__)
*r_cst(uintptr_t *, arg) = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_FS_BASE);
#elif defined(__i386__)
*r_cst(uintptr_t *, arg) = CPU::x32::rdmsr(CPU::x32::MSRID::MSR_FS_BASE);
#endif
return 0;
}
case __SYS_SET_FS:
{
#if defined(__amd64__)
CPU::x64::wrmsr(CPU::x64::MSRID::MSR_FS_BASE, arg1);
#elif defined(__i386__)
CPU::x32::wrmsr(CPU::x32::MSRID::MSR_FS_BASE, arg1);
#endif
return 0;
}
default:
return -EINVAL;
}
}
int sys_brk(SysFrm *Frame, void *end_data);
void *sys_mmap(SysFrm *Frame, void *addr, size_t length, int prot, int flags, int fd, off_t offset);
int sys_munmap(SysFrm *Frame, void *addr, size_t length);
@ -244,6 +300,7 @@ __constructor void __init_native_syscalls(void)
scTbl[SYS_GETPPID] = {"SYS_GETPPID", (void *)sys_getppid};
scTbl[SYS_WAITPID] = {"SYS_WAITPID", (void *)sys_waitpid};
scTbl[SYS_KILL] = {"SYS_KILL", (void *)sys_kill};
scTbl[SYS_PRCTL] = {"SYS_PRCTL", (void *)sys_prctl};
/* Memory */
scTbl[SYS_BRK] = {"SYS_BRK", (void *)sys_brk};