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Improve syscalls for new task switching

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There are a lot of under the hood changes here:
- Move syscalls to be a dispatch table, defined by syscalls.inc
- Don't need a full process state (push_all) in syscalls now
- In push_all, define REGS instead of using offsets
- Save TWO stack pointers as well as current saved stack pointer in TCB:
  - rsp0 is the base of the kernel stack for interrupts
  - rsp3 is the saved user stack from cpu_data
- Update syscall numbers in nulldrv
- Some asm-debugging enhancements to the gdb script
- fork() still not working
This commit is contained in:
Justin C. Miller
2019-04-02 00:25:36 -07:00
parent ca2362f858
commit 11a53e792f
17 changed files with 284 additions and 215 deletions
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2
src/drivers/nulldrv/main.cpp
View File

@@ -16,7 +16,7 @@ main(int argc, const char **argv)
{
int32_t pid = getpid();
//int32_t child = fork();
debug();
//debug();
for (int i = 1; i < 5; ++i)
sleep(i*10);
debug();

9
src/drivers/nulldrv/main.s
View File

@@ -11,7 +11,7 @@ getpid:
push rbp
mov rbp, rsp
mov rax, 5 ; getpid syscall
mov rax, 3 ; getpid syscall
syscall ; pid is now already in rax, so just return
pop rbp
@@ -22,7 +22,7 @@ debug:
push rbp
mov rbp, rsp
mov rax, 1 ; debug syscall
mov rax, 0 ; debug syscall
syscall
pop rbp
@@ -33,7 +33,7 @@ sleep:
push rbp
mov rbp, rsp
mov rax, 4 ; sleep syscall
mov rax, 6 ; sleep syscall
syscall
pop rbp
@@ -44,7 +44,8 @@ fork:
push rbp
mov rbp, rsp
mov rax, 8
mov rax, 0
syscall ; pid left in rax
pop rbp