static void
exec_setregs_funcdesc(struct thread *td, struct image_params *imgp,
u_long stack)
{
struct trapframe *tf;
register_t entry_desc[3];
tf = trapframe(td);
exec_setregs(td, imgp, stack);
/*
* For 64-bit ELFv1, we need to disentangle the function
* descriptor
*
* 0. entry point
* 1. TOC value (r2)
* 2. Environment pointer (r11)
*/
(void)copyin((void *)imgp->entry_addr, entry_desc,
sizeof(entry_desc));
tf->srr0 = entry_desc[0] + imgp->reloc_base;
tf->fixreg[2] = entry_desc[1] + imgp->reloc_base;
tf->fixreg[11] = entry_desc[2] + imgp->reloc_base;
}
/*
* exec_setregs may initialize some registers differently than Linux
* does, thus potentially confusing Linux binaries. If necessary, we
* override the exec_setregs default(s) here.
*/
static void
exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
struct pcb *pcb = td->td_pcb;
exec_setregs(td, imgp, stack);
/* Linux sets %gs to 0, we default to _udatasel */
pcb->pcb_gs = 0;
load_gs(0);
pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
}
static void
freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
exec_setregs(td, imgp, stack);
/*
* See comment in exec_setregs about running 32-bit binaries with 64-bit
* registers.
*/
td->td_frame->sp -= 65536;
/*
* Clear extended address space bit for userland.
*/
td->td_frame->sr &= ~MIPS_SR_UX;
}
static void
cloudabi64_proc_setregs(struct thread *td, struct image_params *imgp,
unsigned long stack)
{
struct trapframe *regs;
exec_setregs(td, imgp, stack);
/*
* The stack now contains a pointer to the TCB and the auxiliary
* vector. Let x0 point to the auxiliary vector, and set
* tpidr_el0 to the TCB.
*/
regs = td->td_frame;
regs->tf_x[0] = td->td_retval[0] =
stack + roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t));
(void)cpu_set_user_tls(td, (void *)stack);
}