From 1163a4b7a38a79ebd153dc5ee76ce93877d21dbd Mon Sep 17 00:00:00 2001 From: John Baldwin Date: Tue, 12 Mar 2019 13:39:02 -0700 Subject: Support the fs_base and gs_base registers on i386. As on amd64, these registers hold the base address of the fs and gs segments, respectively. For i386 these two registers are 32 bits. gdb/ChangeLog: * amd64-fbsd-nat.c (amd64_fbsd_nat_target::read_description): Update calls to i386_target_description to add 'segments' parameter. * amd64-tdep.c (amd64_init_abi): Set tdep->fsbase_regnum. Don't add segment base registers. * arch/i386.c (i386_create_target_description): Add 'segments' parameter to enable segment base registers. * arch/i386.h (i386_create_target_description): Likewise. * features/i386/32bit-segments.xml: New file. * features/i386/32bit-segments.c: Generate. * i386-fbsd-nat.c (i386_fbsd_nat_target::read_description): Update call to i386_target_description to add 'segments' parameter. * i386-fbsd-tdep.c (i386fbsd_core_read_description): Likewise. * i386-go32-tdep.c (i386_go32_init_abi): Likewise. * i386-linux-tdep.c (i386_linux_read_description): Likewise. * i386-tdep.c (i386_validate_tdesc_p): Add segment base registers if feature is present. (i386_gdbarch_init): Pass I386_NUM_REGS to set_gdbarch_num_regs. Add 'segments' parameter to call to i386_target_description. (i386_target_description): Add 'segments' parameter to enable segment base registers. (_initialize_i386_tdep) [GDB_SELF_TEST]: Add 'segments' parameter to call to i386_target_description. * i386-tdep.h (struct gdbarch_tdep): Add 'fsbase_regnum'. (enum i386_regnum): Add I386_FSBASE_REGNUM and I386_GSBASE_REGNUM. Define I386_NUM_REGS. (i386_target_description): Add 'segments' parameter to enable segment base registers. gdb/gdbserver/ChangeLog: * linux-x86-tdesc.c (i386_linux_read_description): Update call to i386_create_target_description for 'segments' parameter. * lynx-i386-low.c (lynx_i386_arch_setup): Likewise. * nto-x86-low.c (nto_x86_arch_setup): Likewise. * win32-i386-low.c (i386_arch_setup): Likewise. --- gdb/arch/i386.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'gdb/arch/i386.c') diff --git a/gdb/arch/i386.c b/gdb/arch/i386.c index 7d29013..ab24cf7 100644 --- a/gdb/arch/i386.c +++ b/gdb/arch/i386.c @@ -28,11 +28,12 @@ #include "../features/i386/32bit-avx512.c" #include "../features/i386/32bit-mpx.c" #include "../features/i386/32bit-pkeys.c" +#include "../features/i386/32bit-segments.c" /* Create i386 target descriptions according to XCR0. */ target_desc * -i386_create_target_description (uint64_t xcr0, bool is_linux) +i386_create_target_description (uint64_t xcr0, bool is_linux, bool segments) { target_desc *tdesc = allocate_target_description (); @@ -53,6 +54,9 @@ i386_create_target_description (uint64_t xcr0, bool is_linux) if (is_linux) regnum = create_feature_i386_32bit_linux (tdesc, regnum); + if (segments) + regnum = create_feature_i386_32bit_segments (tdesc, regnum); + if (xcr0 & X86_XSTATE_AVX) regnum = create_feature_i386_32bit_avx (tdesc, regnum); -- cgit v1.1