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support ptrace(PTRACE_PEEKUSER, ...)

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This commit is contained in:
Tomoki Shirasawa
2014-10-08 14:56:28 +09:00
parent a101aa0534
commit 4b46330624
3 changed files with 144 additions and 4 deletions
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51
arch/x86/kernel/syscall.c
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@@ -195,6 +195,52 @@ do_setpgid(int pid, int pgid)
}
}
void
peekuser(struct process *proc, void *regs0)
{
struct x86_regs *regs = regs0;
if(regs == NULL){
asm("movq %%gs:132, %0" : "=r" (regs));
--regs;
}
if(proc->userp == NULL){
proc->userp = kmalloc(sizeof(struct user), IHK_MC_AP_NOWAIT);
memset(proc->userp, '\0', sizeof(struct user));
}
asm("mov %%db0, %0" :"=r" (proc->userp->u_debugreg[0]));
asm("mov %%db1, %0" :"=r" (proc->userp->u_debugreg[1]));
asm("mov %%db2, %0" :"=r" (proc->userp->u_debugreg[2]));
asm("mov %%db3, %0" :"=r" (proc->userp->u_debugreg[3]));
// asm("mov %%db4, %0" :"=r" (proc->userp->u_debugreg[4]));
// asm("mov %%db5, %0" :"=r" (proc->userp->u_debugreg[5]));
asm("mov %%db6, %0" :"=r" (proc->userp->u_debugreg[6]));
asm("mov %%db7, %0" :"=r" (proc->userp->u_debugreg[7]));
proc->userp->regs.r15 = regs->r15;
proc->userp->regs.r14 = regs->r14;
proc->userp->regs.r13 = regs->r13;
proc->userp->regs.r12 = regs->r12;
proc->userp->regs.rbp = regs->rbp;
proc->userp->regs.rbx = regs->rbx;
proc->userp->regs.r11 = regs->r11;
proc->userp->regs.r10 = regs->r10;
proc->userp->regs.r9 = regs->r9;
proc->userp->regs.r8 = regs->r8;
proc->userp->regs.rax = regs->rax;
proc->userp->regs.rcx = regs->rcx;
proc->userp->regs.rdx = regs->rdx;
proc->userp->regs.rsi = regs->rsi;
proc->userp->regs.rdi = regs->rdi;
proc->userp->regs.rip = regs->rip;
proc->userp->regs.cs = regs->cs;
proc->userp->regs.eflags = regs->rflags;
proc->userp->regs.rsp = regs->rsp;
proc->userp->regs.ss = regs->ss;
asm("mov %%es, %0" :"=r" (proc->userp->regs.es));
asm("mov %%fs, %0" :"=r" (proc->userp->regs.fs));
asm("mov %%gs, %0" :"=r" (proc->userp->regs.gs));
}
extern void coredump(struct process *proc, void *regs);
void
@@ -358,7 +404,7 @@ do_signal(unsigned long rc, void *regs0, struct process *proc, struct sig_pendin
}
}
static int ptrace_report_signal(struct process *proc, struct sig_pending *pending)
static int ptrace_report_signal(struct process *proc, struct x86_regs *regs, struct sig_pending *pending)
{
int sig;
__sigset_t w;
@@ -395,6 +441,7 @@ static int ptrace_report_signal(struct process *proc, struct sig_pending *pendin
waitq_wakeup(&proc->ftn->parent->waitpid_q);
}
peekuser(proc, regs);
dkprintf("ptrace_report_signal,sleeping\n");
/* Sleep */
proc->status = PS_TRACED;
@@ -464,7 +511,7 @@ check_signal(unsigned long rc, void *regs0)
for(sig_bv = pending->sigmask.__val[0], sig = 0; sig_bv; sig++, sig_bv >>= 1);
if((proc->ftn->ptrace & PT_TRACED) && sig != SIGKILL) {
sig = ptrace_report_signal(proc, pending);
sig = ptrace_report_signal(proc, regs, pending);
/* TODO: Tracing process could overwrite signal, so handle the case here. */
}