Differential D3974 Diff 9603 head/sys/amd64/cloudabi64/cloudabi64_sysvec.c

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head/sys/amd64/cloudabi64/cloudabi64_sysvec.c

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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.		* SUCH DAMAGE.
*/		*/

#include <sys/cdefs.h>		#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");		__FBSDID("$FreeBSD$");

#include <sys/param.h>		#include <sys/param.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/imgact_elf.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/proc.h>		#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/sysent.h>		#include <sys/sysent.h>
#include <sys/systm.h>

#include <vm/pmap.h>
#include <vm/vm.h>		#include <vm/vm.h>
		#include <vm/pmap.h>

#include <machine/frame.h>		#include <machine/frame.h>
#include <machine/pcb.h>		#include <machine/pcb.h>
#include <machine/pmap.h>		#include <machine/pmap.h>
#include <machine/psl.h>
#include <machine/vmparam.h>		#include <machine/vmparam.h>

#include <compat/cloudabi/cloudabi_util.h>		#include <compat/cloudabi/cloudabi_util.h>

#include <compat/cloudabi64/cloudabi64_syscall.h>		#include <compat/cloudabi64/cloudabi64_syscall.h>
#include <compat/cloudabi64/cloudabi64_syscalldefs.h>
#include <compat/cloudabi64/cloudabi64_util.h>		#include <compat/cloudabi64/cloudabi64_util.h>

extern const char *cloudabi64_syscallnames[];		extern const char *cloudabi64_syscallnames[];
extern struct sysent cloudabi64_sysent[];		extern struct sysent cloudabi64_sysent[];

static register_t *
cloudabi64_copyout_strings(struct image_params *imgp)
{
uintptr_t begin;
size_t len;

/* Copy out program arguments. */
len = imgp->args->begin_envv - imgp->args->begin_argv;
begin = rounddown2(USRSTACK - len, sizeof(register_t));
copyout(imgp->args->begin_argv, (void *)begin, len);
return ((register_t *)begin);
}

static int		static int
cloudabi64_fixup(register_t *stack_base, struct image_params imgp)
{
char canarybuf[64];
Elf64_Auxargs *args;
struct thread *td;
void argdata, canary;
size_t argdatalen;
int error;

/*
* CloudABI executables do not store the FreeBSD OS release
* number in their header. Set the OS release number to the
* latest version of FreeBSD, so that system calls behave as if
* called natively.
*/
td = curthread;
td->td_proc->p_osrel = __FreeBSD_version;

/* Store canary for stack smashing protection. */
argdata = *stack_base;
arc4rand(canarybuf, sizeof(canarybuf), 0);
*stack_base -= howmany(sizeof(canarybuf), sizeof(register_t));
canary = *stack_base;
error = copyout(canarybuf, canary, sizeof(canarybuf));
if (error != 0)
return (error);

/*
* Compute length of program arguments. As the argument data is
* binary safe, we had to add a trailing null byte in
* exec_copyin_data_fds(). Undo this by reducing the length.
*/
args = (Elf64_Auxargs *)imgp->auxargs;
argdatalen = imgp->args->begin_envv - imgp->args->begin_argv;
if (argdatalen > 0)
--argdatalen;

/* Write out an auxiliary vector. */
cloudabi64_auxv_t auxv[] = {
#define VAL(type, val) { .a_type = (type), .a_val = (val) }
#define PTR(type, ptr) { .a_type = (type), .a_ptr = (uintptr_t)(ptr) }
PTR(CLOUDABI_AT_ARGDATA, argdata),
VAL(CLOUDABI_AT_ARGDATALEN, argdatalen),
PTR(CLOUDABI_AT_CANARY, canary),
VAL(CLOUDABI_AT_CANARYLEN, sizeof(canarybuf)),
VAL(CLOUDABI_AT_NCPUS, mp_ncpus),
VAL(CLOUDABI_AT_PAGESZ, args->pagesz),
PTR(CLOUDABI_AT_PHDR, args->phdr),
VAL(CLOUDABI_AT_PHNUM, args->phnum),
VAL(CLOUDABI_AT_TID, td->td_tid),
#undef VAL
#undef PTR
{ .a_type = CLOUDABI_AT_NULL },
};
*stack_base -= howmany(sizeof(auxv), sizeof(register_t));
return (copyout(auxv, *stack_base, sizeof(auxv)));
}

static int
cloudabi64_fetch_syscall_args(struct thread td, struct syscall_args sa)		cloudabi64_fetch_syscall_args(struct thread td, struct syscall_args sa)
{		{
struct trapframe *frame = td->td_frame;		struct trapframe *frame = td->td_frame;

/* Obtain system call number. */		/* Obtain system call number. */
sa->code = frame->tf_rax;		sa->code = frame->tf_rax;
if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)		if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
return (ENOSYS);		return (ENOSYS);
▲ Show 20 Lines • Show All 89 Lines • ▼ Show 20 Lines	static struct sysentvec cloudabi64_elf_sysvec = {
.sv_set_syscall_retval = cloudabi64_set_syscall_retval,		.sv_set_syscall_retval = cloudabi64_set_syscall_retval,
.sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,		.sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,
.sv_syscallnames = cloudabi64_syscallnames,		.sv_syscallnames = cloudabi64_syscallnames,
.sv_schedtail = cloudabi64_schedtail,		.sv_schedtail = cloudabi64_schedtail,
};		};

INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);		INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);

static Elf64_Brandinfo cloudabi64_brand = {		Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,		.brand = ELFOSABI_CLOUDABI,
.machine = EM_X86_64,		.machine = EM_X86_64,
.sysvec = &cloudabi64_elf_sysvec,		.sysvec = &cloudabi64_elf_sysvec,
.compat_3_brand = "CloudABI",		.compat_3_brand = "CloudABI",
};		};

static int
cloudabi64_modevent(module_t mod, int type, void *data)
{

switch (type) {
case MOD_LOAD:
if (elf64_insert_brand_entry(&cloudabi64_brand) < 0) {
printf("Failed to add CloudABI ELF brand handler\n");
return (EINVAL);
}
return (0);
case MOD_UNLOAD:
if (elf64_brand_inuse(&cloudabi64_brand))
return (EBUSY);
if (elf64_remove_brand_entry(&cloudabi64_brand) < 0) {
printf("Failed to remove CloudABI ELF brand handler\n");
return (EINVAL);
}
return (0);
default:
return (EOPNOTSUPP);
}
}

static moduledata_t cloudabi64_module = {
"cloudabi64",
cloudabi64_modevent,
NULL
};

DECLARE_MODULE_TIED(cloudabi64, cloudabi64_module, SI_SUB_EXEC, SI_ORDER_ANY);
MODULE_DEPEND(cloudabi64, cloudabi, 1, 1, 1);
FEATURE(cloudabi64, "CloudABI 64bit support");