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x86_64: implement functions to jump to userspace

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max 🍓
2026-02-08 11:58:27 +00:00
parent da611ab070
commit 880930e917
3 changed files with 71 additions and 7 deletions
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23
arch/x86_64/thread.c
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@@ -1,12 +1,16 @@
#include <mango/machine/cpu.h>
#include <mango/machine/thread.h>
/* this is the context information restored by ml_thread_switch.
* since ml_thread_switch only jumps to kernel-mode, IRETQ isn't used,
* and the extra register values needed by IRETQ aren't present. */
struct thread_ctx {
uint64_t r15, r14, r13, r12, r11, r10, r9, r8;
uint64_t rdi, rsi, rbp, unused_rsp, rbx, rdx, rcx, rax;
uint64_t rfl;
} __packed;
void prepare_stack(uintptr_t ip, uintptr_t *sp)
void ml_thread_prepare_kernel_context(uintptr_t ip, uintptr_t *sp)
{
(*sp) -= sizeof(uintptr_t);
uintptr_t *dest_ip = (uintptr_t *)(*sp);
@@ -18,3 +22,20 @@ void prepare_stack(uintptr_t ip, uintptr_t *sp)
ctx->rfl = 0x202;
}
extern void ml_thread_prepare_user_context(
virt_addr_t ip,
virt_addr_t user_sp,
virt_addr_t *kernel_sp)
{
(*kernel_sp) -= sizeof(struct ml_cpu_context);
struct ml_cpu_context *ctx = (struct ml_cpu_context *)(*kernel_sp);
ctx->rip = ip;
ctx->rsp = user_sp;
ctx->ss = 0x23;
ctx->cs = 0x1B;
ctx->rflags = 0x202;
ctx->rdi = 0; // arg 0
ctx->rsi = 0; // arg 1
}