arch_prctl.c

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#include "hal/cpu/core.h"
#include "hal/cpu/msr.h"
#include "libk/serial.h"
#include "procc/thread.h"
#include <sys/syscall.h>
 
#define ARCH_SET_GS 0x1001
#define ARCH_SET_FS 0x1002
#define ARCH_GET_FS 0x1003
#define ARCH_GET_GS 0x1004
#define ARCH_GET_CPUID 0x1011
#define ARCH_SET_CPUID 0x1012
 
int syscall_arch_prctl(int code, unsigned long addr) {
    auto thr = get_current_core_data()->active_thread;
    switch (code) {
    case ARCH_SET_FS: {
        serial2_printf("arch_prctl: set fs into 0x%x\n", addr);
        thr->fs_base = addr;
        msrSetFSBase(addr);
        break;
    }
    case ARCH_SET_GS: {
        serial2_printf("arch_prctl: set gs into 0x%x\n", addr);
        thr->gs_base = addr;
        msrSetKernelGSBase(addr);
        break;
    }
    case ARCH_GET_FS: {
        serial2_printf("arch_prctl: get fs into 0x%x\n", addr);
        *(unsigned long*)addr = thr->fs_base;
        break;
    }
    case ARCH_GET_GS: {
        serial2_printf("arch_prctl: get gs into 0x%x\n", addr);
        *(unsigned long*)addr = thr->gs_base;
        break;
    }
    default:
        return -1;
    }
    return 0;
}