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author | Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 15:15:09 +1030 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 16:47:29 +1030 |
commit | 18c137371b2ea86d263b75665a4904a0b8872990 (patch) | |
tree | 59f8e6bf9b43195b8d9d77fb3235468baeb8d946 /drivers/lguest/x86/core.c | |
parent | a454bb36cabdac163fcd80ddb37662893ea603f1 (diff) | |
download | linux-18c137371b2ea86d263b75665a4904a0b8872990.tar.gz linux-18c137371b2ea86d263b75665a4904a0b8872990.tar.bz2 linux-18c137371b2ea86d263b75665a4904a0b8872990.zip |
lguest: add operations to get/set a register from the Launcher.
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>
Diffstat (limited to 'drivers/lguest/x86/core.c')
-rw-r--r-- | drivers/lguest/x86/core.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 922a1acbf652..f7a16b4ea456 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -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 |