[binutils-gdb] gdb: LoongArch: Change LOONGARCH_FIRST_FP_REGNUM to 35

[Tiezhu Yang <yangtiezhu@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1304f47d02bfd0b41ebf4c1c6758a6251c29d8a1

commit 1304f47d02bfd0b41ebf4c1c6758a6251c29d8a1
Author: Hui Li <lihui@loongson.cn>
Date:   Tue Feb 27 09:18:10 2024 +0800

    gdb: LoongArch: Change LOONGARCH_FIRST_FP_REGNUM to 35
    
    There is an assertion error "gdb_assert (n < tdesc->reg_defs.size ())"
    in find_register_by_number() when gdb connects to gdbserver, this
    is because the value of LOONGARCH_LINUX_NUM_GREGSET (45, which contains
    10 reserved regs) is different with the number of regs (35, which not
    contains 10 reserved regs) in file gdb/features/loongarch/base64.xml.
    Add a new macro LOONGARCH_USED_NUM_GREGSET which is defined as 35 to
    keep consistent with the gdb/features/loongarch/base64.xml, and then
    define LOONGARCH_FIRST_FP_REGNUM as LOONGARCH_USED_NUM_GREGSET so that
    all the reg numbers in regcache are consistent with tdesc reg numbers.
    
    without this patch:
    
    Execute on the target machine:
    
      $ gdbserver 192.168.1.123:5678 ./test
    
    Execute on the host machine:
    
      $ gdb ./test
      (gdb) target remote 192.168.1.123:5678
    
    Output on the target machine:
    
      Process ./test created; pid = 67683
      Listening on port 5678
      Remote debugging from host 192.168.1.136, port 6789
      gdbserver/regcache.cc:205: A problem internal to GDBserver has been detected.
      find_register_by_number: Assertion 'n < tdesc->reg_defs.size ()' failed.
    
    Output on the host machine:
    
      Remote debugging using 192.168.1.123:5678
      Remote connection closed
    
    Signed-off-by: Hui Li <lihui@loongson.cn>
    Approved-By: John Baldwin <jhb@FreeBSD.org>
    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Diff:
---
 gdb/arch/loongarch.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gdb/arch/loongarch.h b/gdb/arch/loongarch.h
index 4b7ab054ea0..7056d506bf4 100644
--- a/gdb/arch/loongarch.h
+++ b/gdb/arch/loongarch.h
@@ -33,10 +33,11 @@ enum loongarch_regnum
   LOONGARCH_ORIG_A0_REGNUM = 32,	/* Syscall's original arg0.  */
   LOONGARCH_PC_REGNUM = 33,		/* Program Counter.  */
   LOONGARCH_BADV_REGNUM = 34,		/* Bad Vaddr for Addressing Exception.  */
+  LOONGARCH_USED_NUM_GREGSET = 35,	/* 32 GPR, ORIG_A0, PC, BADV.  */
   LOONGARCH_LINUX_NUM_GREGSET = 45,	/* 32 GPR, ORIG_A0, PC, BADV, RESERVED 10.  */
   LOONGARCH_ARG_REGNUM = 8,            /* r4-r11: general-purpose argument registers.
 					  f0-f7: floating-point argument registers.  */
-  LOONGARCH_FIRST_FP_REGNUM = LOONGARCH_LINUX_NUM_GREGSET,
+  LOONGARCH_FIRST_FP_REGNUM = LOONGARCH_USED_NUM_GREGSET,
   LOONGARCH_LINUX_NUM_FPREGSET = 32,
   LOONGARCH_FIRST_FCC_REGNUM = LOONGARCH_FIRST_FP_REGNUM + LOONGARCH_LINUX_NUM_FPREGSET,
   LOONGARCH_LINUX_NUM_FCC = 8,