amd64: add mc_tlsbase member to mcontext

Tested by:	pho Reviewed by:	olce Sponsored by:	The FreeBSD Foundation MFC after:	1 week Differential revision:https://reviews.freebsd.org/D50482

Author: kostikbel

sys/amd64/amd64/exec_machdep.c

@@ -635,6 +635,8 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
 mcp->mc_gsbase = pcb->pcb_gsbase;
 mcp->mc_xfpustate = 0;
 mcp->mc_xfpustate_len = 0;
+mcp->mc_tlsbase = (pcb->pcb_flags & PCB_TLSBASE) != 0 ?
+ pcb->pcb_tlsbase : 0;
 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
 return (0);
 }
@@ -709,6 +711,10 @@ set_mcontext(struct thread *td, mcontext_t *mcp)
 pcb->pcb_fsbase = mcp->mc_fsbase;
 pcb->pcb_gsbase = mcp->mc_gsbase;
 }
+if ((mcp->mc_flags & _MC_HASTLSBASE) != 0) {
+pcb->pcb_tlsbase = mcp->mc_tlsbase;
+set_pcb_flags(pcb, PCB_TLSBASE);
+}
 return (0);
 }
 

sys/x86/include/frame.h

@@ -152,6 +152,7 @@ struct trapframe {
 #defineTF_HASSEGS0x1
 #defineTF_HASBASES0x2
 #defineTF_HASFPXSTATE0x4
+#defineTF_RESERV00x8 /* no tlsbase in the trapframe */
 #endif /* __amd64__ */
 
 #endif /* _MACHINE_FRAME_H_ */

sys/x86/include/ucontext.h

@@ -99,7 +99,9 @@ typedef struct __mcontext {
 #define_MC_HASSEGS0x1
 #define_MC_HASBASES0x2
 #define_MC_HASFPXSTATE0x4
-#define_MC_FLAG_MASK(_MC_HASSEGS | _MC_HASBASES | _MC_HASFPXSTATE)
+#define_MC_HASTLSBASE0x8
+#define_MC_FLAG_MASK(_MC_HASSEGS | _MC_HASBASES | _MC_HASFPXSTATE | \
+ _MC_HASTLSBASE)
 
 typedef struct __mcontext {
 /*
@@ -158,7 +160,9 @@ typedef struct __mcontext {
 __register_tmc_xfpustate;
 __register_tmc_xfpustate_len;
 
-longmc_spare[4];
+__register_tmc_tlsbase;
+
+longmc_spare[3];
 } mcontext_t;
 #endif /* __amd64__ */