From cec19cdab21e1eda7ae149792d1529bb03c0714b Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Thu, 14 Mar 2024 21:47:23 -0400 Subject: kernel: Add support for syscalls Signed-off-by: Ian Moffett --- sys/arch/amd64/amd64/machdep.c | 3 +++ sys/arch/amd64/amd64/syscall.S | 43 +++++++++++++++++++++++++++++++++++ sys/arch/amd64/amd64/syscall.c | 51 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 97 insertions(+) create mode 100644 sys/arch/amd64/amd64/syscall.S create mode 100644 sys/arch/amd64/amd64/syscall.c (limited to 'sys/arch/amd64') diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c index fa6c1f5..47d6dd0 100644 --- a/sys/arch/amd64/amd64/machdep.c +++ b/sys/arch/amd64/amd64/machdep.c @@ -57,6 +57,8 @@ __KERNEL_META("$Hyra$: machdep.c, Ian Marco Moffett, " #define INIT_FLAG_IOAPIC 0x00000001U #define INIT_FLAG_ACPI 0x00000002U +void syscall_isr(void); + static inline void init_tss(struct cpu_info *cur_cpu) { @@ -82,6 +84,7 @@ interrupts_init(void) idt_set_desc(0xC, IDT_TRAP_GATE_FLAGS, ISR(ss_fault), 0); idt_set_desc(0xD, IDT_TRAP_GATE_FLAGS, ISR(general_prot), 0); idt_set_desc(0xE, IDT_TRAP_GATE_FLAGS, ISR(page_fault), 0); + idt_set_desc(0x80, IDT_INT_GATE_USER, ISR(syscall_isr), 0); idt_load(); } diff --git a/sys/arch/amd64/amd64/syscall.S b/sys/arch/amd64/amd64/syscall.S new file mode 100644 index 0000000..fe70523 --- /dev/null +++ b/sys/arch/amd64/amd64/syscall.S @@ -0,0 +1,43 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + + #include + #include + +__KERNEL_META "$Hyra$: syscall.S, Ian Marco Moffett, \ + Syscall ISR code" + +.text +.globl syscall_isr +syscall_isr: + push_trapframe $0 + mov %rsp, %rdi + call __syscall + pop_trapframe + iretq diff --git a/sys/arch/amd64/amd64/syscall.c b/sys/arch/amd64/amd64/syscall.c new file mode 100644 index 0000000..9b1f988 --- /dev/null +++ b/sys/arch/amd64/amd64/syscall.c @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include + +void +__syscall(struct trapframe *tf) +{ + struct syscall_args args = { + .code = tf->rax, + .arg0 = tf->rdi, + .arg1 = tf->rsi, + .arg2 = tf->rcx, + .arg3 = tf->r8, + .arg4 = tf->r9, + .sp = tf->rsp, + .ret = tf->rax, + }; + + if (args.code < __MAX_SYSCALLS) { + g_syscall_table[tf->rax](&args); + } + + tf->rax = args.ret; +} -- cgit v1.2.3