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Kernel/riscv64: Handle syscalls

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sepc has to be incremented before the call to syscall_handler,
as we otherwise would return to the ecall instruction, resulting in an
infinite trap loop.
We can't increment it after syscall_handler, as sepc might get changed
while handling the syscall.
This commit is contained in:
Sönke Holz 2024-03-07 22:53:12 +01:00 committed by Andrew Kaster
parent 04ca9f393f
commit afe9a12412
Notes: sideshowbarker 2024-07-16 23:05:02 +09:00 
Author: https://github.com/spholz
Commit: https://github.com/SerenityOS/serenity/commit/afe9a12412
Pull-request: https://github.com/SerenityOS/serenity/pull/23530
1 changed files with 4 additions and 1 deletions
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5
Kernel/Arch/riscv64/Interrupts.cpp
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@ -19,6 +19,8 @@
namespace Kernel {
extern "C" void syscall_handler(TrapFrame const*);
// FIXME: Share this array with x86_64/aarch64 somehow and consider if this really needs to use raw pointers and not OwnPtrs
static Array<GenericInterruptHandler*, 64> s_interrupt_handlers;
@ -103,7 +105,8 @@ extern "C" void trap_handler(TrapFrame& trap_frame)
}
case EnvironmentCallFromUMode:
TODO_RISCV64();
trap_frame.regs->sepc += 4;
syscall_handler(&trap_frame);
break;
case Breakpoint: