From dd6876c91cd40cc105b1a91f418ca2c80683b314 Mon Sep 17 00:00:00 2001 From: John Baldwin Date: Tue, 12 Mar 2019 13:39:02 -0700 Subject: Support fs_base and gs_base on FreeBSD/i386. The i386 BSD native target uses the same ptrace operations (PT_[GS]ET[FG]SBASE) as the amd64 BSD native target to fetch and store the registers. The amd64 BSD native now uses 'tdep->fsbase_regnum' instead of hardcoding AMD64_FSBASE_REGNUM and AMD64_GSBASE_REGNUM to support 32-bit targets. In addition, the store operations explicitly zero the new register value before fetching it from the register cache to ensure 32-bit values are zero-extended. gdb/ChangeLog: * amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use tdep->fsbase_regnum instead of constants for fs_base and gs_base. (amd64bsd_store_inferior_registers): Likewise. * amd64-fbsd-nat.c (amd64_fbsd_nat_target::read_description): Enable segment base registers. * i386-bsd-nat.c (i386bsd_fetch_inferior_registers): Use PT_GETFSBASE and PT_GETGSBASE. (i386bsd_store_inferior_registers): Use PT_SETFSBASE and PT_SETGSBASE. * i386-fbsd-nat.c (i386_fbsd_nat_target::read_description): Enable segment base registers. * i386-fbsd-tdep.c (i386fbsd_core_read_description): Likewise. --- gdb/amd64-fbsd-nat.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'gdb/amd64-fbsd-nat.c') diff --git a/gdb/amd64-fbsd-nat.c b/gdb/amd64-fbsd-nat.c index 9fff763..cc676d3 100644 --- a/gdb/amd64-fbsd-nat.c +++ b/gdb/amd64-fbsd-nat.c @@ -190,13 +190,13 @@ amd64_fbsd_nat_target::read_description () if (is64) return amd64_target_description (xcr0, true); else - return i386_target_description (xcr0, false); + return i386_target_description (xcr0, true); } #endif if (is64) return amd64_target_description (X86_XSTATE_SSE_MASK, true); else - return i386_target_description (X86_XSTATE_SSE_MASK, false); + return i386_target_description (X86_XSTATE_SSE_MASK, true); } #if defined(HAVE_PT_GETDBREGS) && defined(USE_SIGTRAP_SIGINFO) -- cgit v1.1