diff --git a/Kernel/Tasks/Process.cpp b/Kernel/Tasks/Process.cpp index 7a0fc7f071..0484914e9b 100644 --- a/Kernel/Tasks/Process.cpp +++ b/Kernel/Tasks/Process.cpp @@ -458,13 +458,31 @@ void signal_trampoline_dummy() "asm_signal_trampoline_end: \n" ::[sigreturn_syscall_number] "i"(Syscall::SC_sigreturn), [offset_to_first_register_slot] "i"(offset_to_first_register_slot)); #elif ARCH(RISCV64) - constexpr static auto offset_to_a0_slot = align_up_to(sizeof(__ucontext) + sizeof(siginfo) + sizeof(FPUState) + 3 * sizeof(FlatPtr), 16); + constexpr static auto offset_to_a0_slot = sizeof(__ucontext) + sizeof(siginfo) + sizeof(FPUState) + 4 * sizeof(FlatPtr); asm( ".global asm_signal_trampoline\n" "asm_signal_trampoline:\n" // stack state: 0, ucontext, signal_info (alignment = 16), fpu_state (alignment = 16), ucontext*, siginfo*, signal, handler - // FIXME: Implement this + // Load the handler address into t0. + "ld t0, 0(sp)\n" + // Store a0 (return value from a syscall) into the register slot, such that we can return the correct value in sys$sigreturn. + "sd a0, %[offset_to_first_register_slot](sp)\n" + // Load the signal number into the first argument. + "ld a0, 8(sp)\n" + // Load a pointer to the signal_info structure into the second argument. + "ld a1, 16(sp)\n" + // Load a pointer to the ucontext into the third argument. + "ld a2, 24(sp)\n" + // Pop the values off the stack. + "addi sp, sp, 32\n" + // Call the signal handler. + "jalr t0\n" + + // Call sys$sigreturn. + "li a7, %[sigreturn_syscall_number]\n" + "ecall\n" + // We should never return, so trap if we do return. "unimp\n" "\n"