diff options
Diffstat (limited to 'sys/compat/linux/linux_misc.c')
| -rw-r--r-- | sys/compat/linux/linux_misc.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c index 323ecdb..2dd6a80 100644 --- a/sys/compat/linux/linux_misc.c +++ b/sys/compat/linux/linux_misc.c @@ -57,6 +57,8 @@ #include <machine/frame.h> #include <machine/psl.h> +#include <machine/sysarch.h> +#include <machine/segments.h> #include <i386/linux/linux.h> #include <i386/linux/linux_proto.h> @@ -1343,3 +1345,85 @@ linux_sched_getscheduler(p, uap) return error; } + +struct linux_descriptor { + unsigned int entry_number; + unsigned long base_addr; + unsigned int limit; + unsigned int seg_32bit:1; + unsigned int contents:2; + unsigned int read_exec_only:1; + unsigned int limit_in_pages:1; + unsigned int seg_not_present:1; + unsigned int useable:1; +}; + +int +linux_modify_ldt(p, uap) + struct proc *p; + struct linux_modify_ldt_args *uap; +{ + int error; + caddr_t sg; + struct sysarch_args args; + struct i386_ldt_args *ldt; + struct linux_descriptor ld; + union descriptor *desc; + + sg = stackgap_init(); + + if (uap->ptr == NULL) + return (EINVAL); + + switch (uap->func) { + case 0x00: /* read_ldt */ + ldt = stackgap_alloc(&sg, sizeof(*ldt)); + ldt->start = 0; + ldt->desc = uap->ptr; + ldt->num = uap->bytecount / sizeof(union descriptor); + args.op = I386_GET_LDT; + args.parms = (char*)ldt; + error = sysarch(p, &args); + p->p_retval[0] *= sizeof(union descriptor); + break; + case 0x01: /* write_ldt */ + case 0x11: /* write_ldt */ + if (uap->bytecount != sizeof(ld)) + return (EINVAL); + + error = copyin(uap->ptr, &ld, sizeof(ld)); + if (error) + return (error); + + ldt = stackgap_alloc(&sg, sizeof(*ldt)); + desc = stackgap_alloc(&sg, sizeof(*desc)); + ldt->start = ld.entry_number; + ldt->desc = desc; + ldt->num = 1; + desc->sd.sd_lolimit = (ld.limit & 0x0000ffff); + desc->sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; + desc->sd.sd_lobase = (ld.base_addr & 0x00ffffff); + desc->sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; + desc->sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | + (ld.contents << 2); + desc->sd.sd_dpl = 3; + desc->sd.sd_p = (ld.seg_not_present ^ 1); + desc->sd.sd_xx = 0; + desc->sd.sd_def32 = ld.seg_32bit; + desc->sd.sd_gran = ld.limit_in_pages; + args.op = I386_SET_LDT; + args.parms = (char*)ldt; + error = sysarch(p, &args); + break; + default: + error = EINVAL; + break; + } + + if (error == EOPNOTSUPP) { + printf("linux: modify_ldt needs kernel option USER_LDT\n"); + error = ENOSYS; + } + + return (error); +} |
