[glibc] hurd: Use uintptr_t for register values in trampoline.c

[glibc] hurd: Use uintptr_t for register values in trampoline.c

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a1fbae752722a4f59127d74c362d3247f277be24

commit a1fbae752722a4f59127d74c362d3247f277be24
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Sun Mar 19 18:09:58 2023 +0300

    hurd: Use uintptr_t for register values in trampoline.c
    
    This is more correct, if only because these fields are defined as having
    the type unsigned int in the Mach headers, so casting them to a signed
    int and then back is suboptimal.
    
    Also, remove an extra reassignment of uesp -- this is another remnant of
    the ecx kludge.
    
    Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
    Message-Id: <20230319151017.531737-16-bugaevc@gmail.com>

Diff:
---
 sysdeps/mach/hurd/i386/trampoline.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c
index 8f481e79b8..ab67fb9cd2 100644
--- a/sysdeps/mach/hurd/i386/trampoline.c
+++ b/sysdeps/mach/hurd/i386/trampoline.c
@@ -270,24 +270,23 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action
 
       _hurdsig_end_catch_fault ();
 
-      state->basic.eip = (int) rpc_wait_trampoline;
+      state->basic.eip = (uintptr_t) rpc_wait_trampoline;
       /* The reply-receiving trampoline code runs initially on the original
 	 user stack.  We pass it the signal stack pointer in %ebx.  */
-      state->basic.uesp = state->basic.esp; /* Restore mach_msg syscall SP.  */
-      state->basic.ebx = (int) sigsp;
+      state->basic.ebx = (uintptr_t) sigsp;
       /* After doing the message receive, the trampoline code will need to
 	 update the %eax value to be restored by sigreturn.  To simplify
 	 the assembly code, we pass the address of its slot in SCP to the
 	 trampoline code in %ecx.  */
-      state->basic.ecx = (int) &scp->sc_eax;
+      state->basic.ecx = (uintptr_t) &scp->sc_eax;
     }
   else
     {
-      state->basic.eip = (int) trampoline;
-      state->basic.uesp = (int) sigsp;
+      state->basic.eip = (uintptr_t) trampoline;
+      state->basic.uesp = (uintptr_t) sigsp;
     }
   /* We pass the handler function to the trampoline code in %edx.  */
-  state->basic.edx = (int) handler;
+  state->basic.edx = (uintptr_t) handler;
 
   /* The x86 ABI says the DF bit is clear on entry to any function.  */
   state->basic.efl &= ~EFL_DF;