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https://github.com/RGBCube/serenity
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Import the "gerbert" kernel I worked on earlier this year.
It's a lot crappier than I remembered it. It's gonna need a lot of work.
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144
Kernel/Syscall.cpp
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144
Kernel/Syscall.cpp
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#include "i386.h"
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#include "VGA.h"
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#include "Task.h"
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#include "Syscall.h"
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struct RegisterDump {
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WORD gs;
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WORD fs;
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WORD es;
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WORD ds;
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DWORD edi;
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DWORD esi;
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DWORD ebp;
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DWORD esp;
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DWORD ebx;
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DWORD edx;
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DWORD ecx;
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DWORD eax;
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DWORD eip;
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WORD cs;
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WORD __csPadding;
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DWORD eflags;
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} PACKED;
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extern "C" void syscall_entry();
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extern "C" void syscall_ISR();
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extern volatile RegisterDump* syscallRegDump;
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asm(
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".globl syscall_ISR \n"
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".globl syscallRegDump \n"
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"syscallRegDump: \n"
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".long 0\n"
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"syscall_ISR:\n"
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" pusha\n"
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" pushw %ds\n"
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" pushw %es\n"
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" pushw %fs\n"
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" pushw %gs\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" popw %ds\n"
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" popw %es\n"
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" popw %fs\n"
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" popw %gs\n"
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" mov %esp, syscallRegDump\n"
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" call syscall_entry\n"
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" popw %gs\n"
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" popw %fs\n"
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" popw %es\n"
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" popw %ds\n"
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" popa\n"
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" iret\n"
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);
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namespace Syscall {
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void initialize()
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{
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registerUserCallableInterruptHandler(0x80, syscall_ISR);
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kprintf("syscall: int 0x80 handler installed\n");
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}
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DWORD invoke(DWORD function)
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{
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DWORD result;
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asm("int $0x80":"=a"(result):"a"(function));
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return result;
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}
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DWORD invoke(DWORD function, DWORD arg1)
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{
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DWORD result;
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asm("int $0x80":"=a"(result):"a"(function),"d"(arg1));
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return result;
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}
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DWORD invoke(DWORD function, DWORD arg1, DWORD arg2)
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{
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DWORD result;
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asm("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2));
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return result;
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}
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DWORD invoke(DWORD function, DWORD arg1, DWORD arg2, DWORD arg3)
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{
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DWORD result;
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asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2),"b"(arg3));
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return result;
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}
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DWORD handle(DWORD function, DWORD arg1, DWORD arg2, DWORD arg3)
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{
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switch (function) {
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case Syscall::Yield:
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yield();
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break;
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case 0x1235: // putch
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kprintf( "%c", arg1 & 0xFF );
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break;
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case Syscall::Sleep:
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kprintf("syscall: sleep(%d)\n", arg1);
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current->sys$sleep(arg1);
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break;
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case Syscall::PosixOpen:
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Task::checkSanity("syscall");
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kprintf("syscall: open('%s', %u)\n", arg1, arg2);
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return current->sys$open((const char*)arg1, (size_t)arg2);
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case Syscall::PosixClose:
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kprintf("syscall: close(%d)\n", arg1);
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return current->sys$close((int)arg1);
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case Syscall::PosixRead:
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kprintf("syscall: read(%d, %p, %u)\n", arg1, arg2, arg3);
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return current->sys$read((int)arg1, (void*)arg2, (size_t)arg3);
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case Syscall::PosixSeek:
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// FIXME: This has the wrong signature, should be like lseek()
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kprintf("syscall: seek(%d, %p, %u)\n", arg1, arg2, arg3);
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return current->sys$read((int)arg1, (void*)arg2, (size_t)arg3);
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case Syscall::PosixKill:
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kprintf("syscall: kill(%d, %d)\n", arg1, arg2);
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return current->sys$kill((pid_t)arg1, (int)arg2);
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case Syscall::PosixGetuid:
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return current->sys$getuid();
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default:
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kprintf("int0x80: Unknown function %x requested {%x, %x, %x}\n", function, arg1, arg2, arg3);
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break;
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}
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return 0;
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}
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}
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void syscall_entry()
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{
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auto& regs = *syscallRegDump;
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DWORD function = regs.eax;
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DWORD arg1 = regs.edx;
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DWORD arg2 = regs.ecx;
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DWORD arg3 = regs.ebx;
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regs.eax = Syscall::handle(function, arg1, arg2, arg3);
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}
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