Enable shared page for the signal trampolines on PowerPC.

Reviewed and tested by:	nwhitehorn

4 files changed, 14 insertions, 8 deletions

diff --git a/sys/powerpc/include/vmparam.h b/sys/powerpc/include/vmparam.h
index b92ce70..d72e0ea 100644
--- a/sys/powerpc/include/vmparam.h
+++ b/sys/powerpc/include/vmparam.h
@@ -35,7 +35,7 @@
 #ifndef _MACHINE_VMPARAM_H_
 #define	_MACHINE_VMPARAM_H_
 
-#define	USRSTACK	VM_MAXUSER_ADDRESS
+#define	USRSTACK	SHAREDPAGE
 
 #ifndef	MAXTSIZ
 #define	MAXTSIZ		(64*1024*1024)		/* max text size */
@@ -64,10 +64,12 @@
 #ifdef __powerpc64__
 #define	VM_MIN_ADDRESS		(0x0000000000000000UL)
 #define	VM_MAXUSER_ADDRESS	(0x7ffffffffffff000UL)
+#define	SHAREDPAGE		(VM_MAXUSER_ADDRESS - PAGE_SIZE)
 #define	VM_MAX_ADDRESS		(0xffffffffffffffffUL)
 #else
 #define	VM_MIN_ADDRESS		((vm_offset_t)0)
 #define	VM_MAXUSER_ADDRESS	((vm_offset_t)0x7ffff000)
+#define	SHAREDPAGE		(VM_MAXUSER_ADDRESS - PAGE_SIZE)
 #define	VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
 #endif
 #else /* LOCORE */
@@ -77,8 +79,8 @@
 #endif
 #endif /* LOCORE */
 
-#define	FREEBSD32_USRSTACK	0x7ffff000
-
+#define	FREEBSD32_SHAREDPAGE	(0x7ffff000 - PAGE_SIZE)
+#define	FREEBSD32_USRSTACK	FREEBSD32_SHAREDPAGE
 
 #ifdef AIM
 #define	KERNBASE		0x00100000UL	/* start of kernel virtual */
diff --git a/sys/powerpc/powerpc/elf32_machdep.c b/sys/powerpc/powerpc/elf32_machdep.c
index 1761215..e35bd19 100644
--- a/sys/powerpc/powerpc/elf32_machdep.c
+++ b/sys/powerpc/powerpc/elf32_machdep.c
@@ -101,10 +101,13 @@ struct sysentvec elf32_freebsd_sysvec = {
 #endif
 	.sv_fixlimit	= NULL,
 	.sv_maxssiz	= NULL,
-	.sv_flags	= SV_ABI_FREEBSD | SV_ILP32,
+	.sv_flags	= SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
 	.sv_set_syscall_retval = cpu_set_syscall_retval,
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
+	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
+	.sv_shared_page_len = PAGE_SIZE,
 };
+INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
 static Elf32_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
diff --git a/sys/powerpc/powerpc/elf64_machdep.c b/sys/powerpc/powerpc/elf64_machdep.c
index 1b51920..af5b12d 100644
--- a/sys/powerpc/powerpc/elf64_machdep.c
+++ b/sys/powerpc/powerpc/elf64_machdep.c
@@ -76,11 +76,14 @@ struct sysentvec elf64_freebsd_sysvec = {
 	.sv_setregs	= exec_setregs,
 	.sv_fixlimit	= NULL,
 	.sv_maxssiz	= NULL,
-	.sv_flags	= SV_ABI_FREEBSD | SV_LP64,
+	.sv_flags	= SV_ABI_FREEBSD | SV_LP64 | SV_SHP,
 	.sv_set_syscall_retval = cpu_set_syscall_retval,
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
+	.sv_shared_page_base = SHAREDPAGE,
+	.sv_shared_page_len = PAGE_SIZE,
 };
+INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
 
 static Elf64_Brandinfo freebsd_brand_info = {
 	.brand		= ELFOSABI_FREEBSD,
@@ -114,7 +117,6 @@ SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
 	(sysinit_cfunc_t) elf64_insert_brand_entry,
 	&freebsd_brand_oinfo);
 
-
 void
 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
     size_t *off __unused)
diff --git a/sys/powerpc/powerpc/exec_machdep.c b/sys/powerpc/powerpc/exec_machdep.c
index efcd805..9d38d70 100644
--- a/sys/powerpc/powerpc/exec_machdep.c
+++ b/sys/powerpc/powerpc/exec_machdep.c
@@ -290,8 +290,7 @@ sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
 	mtx_unlock(&psp->ps_mtx);
 	PROC_UNLOCK(p);
 
-	tf->srr0 = (register_t)(p->p_sysent->sv_psstrings -
-	    *(p->p_sysent->sv_szsigcode));
+	tf->srr0 = (register_t)p->p_sysent->sv_sigcode_base;
 
 	/*
 	 * copy the frame out to userland.