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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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src/kernel/tasking.inc
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@@ -1,6 +1,7 @@
struc TCB
.rsp: resq 1
.rsp0: resq 1
.rsp3: resq 1
.pml4: resq 1
endstruc