[binutils-gdb] PowerPC, correct the gdb ioctl values for TCGETS, TCSETS, TCSETSW and TCSETSF.

[Carl Love <carll@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b69a68b93bf31bf17fe0b9db3fef4f4d6d089626

commit b69a68b93bf31bf17fe0b9db3fef4f4d6d089626
Author: Carl Love <cel@us.ibm.com>
Date:   Fri Jun 10 16:17:27 2022 +0000

    PowerPC, correct the gdb ioctl values for TCGETS, TCSETS, TCSETSW and TCSETSF.
    
    Some of the ioctl numbers are based on the size of kernel termios structure.
    Currently the PowerPC GDB definitions are "hard coded" into the ioctl
    number.
    
    The current PowerPC values for TCGETS, TCSETS, TCSETSW and TCSETSF are
    defined in gdb/ppc-linux-tdep.c as:
    
      record_tdep->ioctl_TCGETS = 0x403c7413;
      record_tdep->ioctl_TCSETS = 0x803c7414;
      record_tdep->ioctl_TCSETSW = 0x803c7415;
      record_tdep->ioctl_TCSETSF = 0x803c7416;
    
    Where the termios structure size is in hex digits [5:4] as 0x3c.
    
    The definition for the PowerPC termios structure is given in:
      arch/powerpc/include/uapi/asm/termbits.h
    
    The size of the termios data structure in this file is 0x2c not 0x3c.
    
    This patch changes the hex digits for the size of the PowerPC termios size
    in the ioctl values for TCGETS, TCSETS, TCSETSW and TCSETSF to 0x2c.
    This patch also changes the hard coding to generate the number based on a
    it easier to update the ioctl numbers.

Diff:
---
 gdb/ppc-linux-tdep.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 4c5f8b7a281..bf95f395515 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -1738,6 +1738,11 @@ static void
 ppc_init_linux_record_tdep (struct linux_record_tdep *record_tdep,
 			    int wordsize)
 {
+  /* The values for TCGETS, TCSETS, TCSETSW, TCSETSF are based on the
+     size of struct termios in the kernel source.
+     include/uapi/asm-generic/termbits.h  */
+#define SIZE_OF_STRUCT_TERMIOS  0x2c
+
   /* Simply return if it had been initialized.  */
   if (record_tdep->size_pointer != 0)
     return;
@@ -1899,14 +1904,15 @@ ppc_init_linux_record_tdep (struct linux_record_tdep *record_tdep,
   /* These values are the second argument of system call "sys_ioctl".
      They are obtained from Linux Kernel source.
      See arch/powerpc/include/uapi/asm/ioctls.h.  */
-  record_tdep->ioctl_TCGETS = 0x403c7413;
-  record_tdep->ioctl_TCSETS = 0x803c7414;
-  record_tdep->ioctl_TCSETSW = 0x803c7415;
-  record_tdep->ioctl_TCSETSF = 0x803c7416;
   record_tdep->ioctl_TCGETA = 0x40147417;
   record_tdep->ioctl_TCSETA = 0x80147418;
   record_tdep->ioctl_TCSETAW = 0x80147419;
   record_tdep->ioctl_TCSETAF = 0x8014741c;
+  record_tdep->ioctl_TCGETS = 0x40007413 | (SIZE_OF_STRUCT_TERMIOS << 16);
+  record_tdep->ioctl_TCSETS = 0x80007414 | (SIZE_OF_STRUCT_TERMIOS << 16);
+  record_tdep->ioctl_TCSETSW = 0x80007415 | (SIZE_OF_STRUCT_TERMIOS << 16);
+  record_tdep->ioctl_TCSETSF = 0x80007416 | (SIZE_OF_STRUCT_TERMIOS << 16);
+
   record_tdep->ioctl_TCSBRK = 0x2000741d;
   record_tdep->ioctl_TCXONC = 0x2000741e;
   record_tdep->ioctl_TCFLSH = 0x2000741f;