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lguest: add operations to get/set a register from the Launcher.

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We use the ptrace API struct, and we currently don't let them set
anything but the normal registers (we'd have to filter the others).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-02-11 15:15:09 +10:30
parent a454bb36ca
commit 18c137371b
5 changed files with 108 additions and 0 deletions
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46
drivers/lguest/x86/core.c
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@@ -181,6 +181,52 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages)
}
/*:*/
unsigned long *lguest_arch_regptr(struct lg_cpu *cpu, size_t reg_off, bool any)
{
switch (reg_off) {
case offsetof(struct pt_regs, bx):
return &cpu->regs->ebx;
case offsetof(struct pt_regs, cx):
return &cpu->regs->ecx;
case offsetof(struct pt_regs, dx):
return &cpu->regs->edx;
case offsetof(struct pt_regs, si):
return &cpu->regs->esi;
case offsetof(struct pt_regs, di):
return &cpu->regs->edi;
case offsetof(struct pt_regs, bp):
return &cpu->regs->ebp;
case offsetof(struct pt_regs, ax):
return &cpu->regs->eax;
case offsetof(struct pt_regs, ip):
return &cpu->regs->eip;
case offsetof(struct pt_regs, sp):
return &cpu->regs->esp;
}
/* Launcher can read these, but we don't allow any setting. */
if (any) {
switch (reg_off) {
case offsetof(struct pt_regs, ds):
return &cpu->regs->ds;
case offsetof(struct pt_regs, es):
return &cpu->regs->es;
case offsetof(struct pt_regs, fs):
return &cpu->regs->fs;
case offsetof(struct pt_regs, gs):
return &cpu->regs->gs;
case offsetof(struct pt_regs, cs):
return &cpu->regs->cs;
case offsetof(struct pt_regs, flags):
return &cpu->regs->eflags;
case offsetof(struct pt_regs, ss):
return &cpu->regs->ss;
}
}
return NULL;
}
/*M:002
* There are hooks in the scheduler which we can register to tell when we
* get kicked off the CPU (preempt_notifier_register()). This would allow us