linux-user: Populate sigreturn_region_{start,end} in all vdso.S

Mark the regions which contain sigreturn syscalls within
each vdso.  Rebuild the shared objects.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

linux-user/aarch64/vdso.S

@@ -71,5 +71,7 @@ vdso_syscall __kernel_clock_getres, __NR_clock_getres
 __kernel_rt_sigreturn:
 	/* No BTI C insn here -- we arrive via RET. */
 	mov	x8, #__NR_rt_sigreturn
+sigreturn_region_start:
 	svc	#0
+sigreturn_region_end:
 endf	__kernel_rt_sigreturn

linux-user/arm/vdso.S

@@ -140,6 +140,7 @@ SYSCALL __vdso_gettimeofday, __NR_gettimeofday
 
 	.balign	16
 sigreturn_codes:
+sigreturn_region_start:
 	/* [EO]ABI sigreturn */
 	slot	0
 	raw_syscall __NR_sigreturn
@@ -172,3 +173,4 @@ sigreturn_codes:
 
 	.balign	16
 endf sigreturn_codes
+sigreturn_region_end:

linux-user/hppa/vdso.S

@@ -156,8 +156,10 @@
 __kernel_sigtramp_rt:
 	ldi	0, %r25
 	ldi	__NR_rt_sigreturn, %r20
+sigreturn_region_start:
 	be,l	0x100(%sr2, %r0), %sr0, %r31
 	nop
+sigreturn_region_end:
 
 	.cfi_endproc
 	.size	__kernel_sigtramp_rt, . - __kernel_sigtramp_rt

linux-user/i386/vdso.S

@@ -114,6 +114,7 @@ vdso_syscall3 __vdso_getcpu, __NR_gettimeofday
  */
 	nop
 
+sigreturn_region_start:
 __kernel_sigreturn:
 	popl	%eax	/* pop sig */
 	.cfi_adjust_cfa_offset -4
@@ -128,6 +129,7 @@ __kernel_rt_sigreturn:
 	movl	$__NR_rt_sigreturn, %eax
 	int	$0x80
 endf	__kernel_rt_sigreturn
+sigreturn_region_end:
 
 	.cfi_endproc
 

linux-user/loongarch64/vdso.S

@@ -125,6 +125,8 @@ vdso_syscall __vdso_getcpu, __NR_getcpu
 
 __vdso_rt_sigreturn:
 	li.w	$a7, __NR_rt_sigreturn
+sigreturn_region_start:
 	syscall	0
+sigreturn_region_end:
 	.cfi_endproc
 endf __vdso_rt_sigreturn

linux-user/ppc/vdso.S

@@ -220,6 +220,7 @@ endf	__kernel_sync_dicache
 
 	nop
 
+sigreturn_region_start:
 __kernel_sigtramp_rt:
 	raw_syscall __NR_rt_sigreturn
 endf	__kernel_sigtramp_rt
@@ -235,5 +236,6 @@ __kernel_sigtramp32:
 	raw_syscall __NR_sigreturn
 endf	__kernel_sigtramp32
 #endif
+sigreturn_region_end:
 
 	.cfi_endproc

linux-user/riscv/vdso.S

@@ -181,7 +181,9 @@ endf __vdso_flush_icache
 	nop
 
 __vdso_rt_sigreturn:
+sigreturn_region_start:
 	raw_syscall __NR_rt_sigreturn
+sigreturn_region_end:
 endf __vdso_rt_sigreturn
 
 	.cfi_endproc

linux-user/s390x/vdso.S

@@ -52,6 +52,7 @@ vdso_syscall __kernel_getcpu, __NR_getcpu
  * by all users.  Without it we get the fallback signal frame handling.
  */
 
+sigreturn_region_start:
 __kernel_sigreturn:
 	raw_syscall __NR_sigreturn
 endf	__kernel_sigreturn
@@ -59,3 +60,4 @@ endf	__kernel_sigreturn
 __kernel_rt_sigreturn:
 	raw_syscall __NR_rt_sigreturn
 endf	__kernel_rt_sigreturn
+sigreturn_region_end: