diff options
Diffstat (limited to 'sys/amd64/ia32/ia32_syscall.c')
| -rw-r--r-- | sys/amd64/ia32/ia32_syscall.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sys/amd64/ia32/ia32_syscall.c b/sys/amd64/ia32/ia32_syscall.c index 9a3488e..0b46dae 100644 --- a/sys/amd64/ia32/ia32_syscall.c +++ b/sys/amd64/ia32/ia32_syscall.c @@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$"); */ #include "opt_clock.h" +#include "opt_compat.h" #include "opt_cpu.h" #include "opt_isa.h" @@ -78,7 +79,17 @@ __FBSDID("$FreeBSD$"); #include <machine/intr_machdep.h> #include <machine/md_var.h> +#include <compat/freebsd32/freebsd32_signal.h> #include <compat/freebsd32/freebsd32_util.h> +#include <compat/ia32/ia32_signal.h> +#include <machine/psl.h> +#include <machine/segments.h> +#include <machine/specialreg.h> +#include <machine/sysarch.h> +#include <machine/frame.h> +#include <machine/md_var.h> +#include <machine/pcb.h> +#include <machine/cpufunc.h> #define IDTVEC(name) __CONCAT(X,name) @@ -198,3 +209,45 @@ ia32_syscall_disable(void *dummy) SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL); SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL); + +#ifdef COMPAT_43 +int +setup_lcall_gate(void) +{ + struct i386_ldt_args uap; + struct user_segment_descriptor descs[2]; + struct gate_descriptor *ssd; + uint32_t lcall_addr; + int error; + + bzero(&uap, sizeof(uap)); + uap.start = 0; + uap.num = 2; + + /* + * This is the easiest way to cut the space for system + * descriptor in ldt. Manually adjust the descriptor type to + * the call gate later. + */ + bzero(&descs[0], sizeof(descs)); + descs[0].sd_type = SDT_SYSNULL; + descs[1].sd_type = SDT_SYSNULL; + error = amd64_set_ldt(curthread, &uap, descs); + if (error != 0) + return (error); + + lcall_addr = curproc->p_sysent->sv_psstrings - sz_lcall_tramp; + mtx_lock(&dt_lock); + ssd = (struct gate_descriptor *)(curproc->p_md.md_ldt->ldt_base); + bzero(ssd, sizeof(*ssd)); + ssd->gd_looffset = lcall_addr; + ssd->gd_hioffset = lcall_addr >> 16; + ssd->gd_selector = _ucode32sel; + ssd->gd_type = SDT_SYSCGT; + ssd->gd_dpl = SEL_UPL; + ssd->gd_p = 1; + mtx_unlock(&dt_lock); + + return (0); +} +#endif |
