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[kernel] Save ring3 rflags in cpu_data, not just stack

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So that kernel code can modify user rflags, save it in the CPU state
data, and save that off to the TCB when switching tasks.
This commit is contained in:
Justin C. Miller
2021-12-23 16:46:47 -08:00
parent c23a1bfabb
commit f250a33e9b
5 changed files with 14 additions and 2 deletions
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4
src/kernel/syscall.s
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@@ -31,6 +31,7 @@ syscall_handler_prelude:
swapgs
mov [gs:CPU_DATA.rsp3], rsp
mov rsp, [gs:CPU_DATA.rsp0]
mov [gs:CPU_DATA.rflags3], r11
push rcx
push rbp
@@ -44,7 +45,6 @@ syscall_handler_prelude:
mov rcx, r10
push rbx
push r11
push r12
push r13
push r14
@@ -76,12 +76,12 @@ kernel_to_user_trampoline:
pop r14
pop r13
pop r12
pop r11
pop rbx
pop rbp
pop rcx
mov r11, [gs:CPU_DATA.rflags3]
mov [gs:CPU_DATA.rsp0], rsp
mov rsp, [gs:CPU_DATA.rsp3]