On Tue, Oct 20, 2015 at 2:27 PM, Richard Henderson <r...@redhat.com> wrote:
> ---
> gcc/config/i386/i386.c | 21 +++++++++++++++++++++
> gcc/doc/tm.texi | 7 +++++++
> gcc/doc/tm.texi.in | 2 ++
> gcc/dwarf2out.c | 48 +++++++++++++++++++++++++++++-------------------
> gcc/target.def | 10 ++++++++++
> gcc/targhooks.c | 8 ++++++++
> gcc/targhooks.h | 1 +
> 7 files changed, 78 insertions(+), 19 deletions(-)
>
> diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> index 8f833d1..9fb0fac 100644
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -53707,6 +53707,27 @@ ix86_addr_space_convert (rtx op, tree from_type,
> tree to_type)
> #undef TARGET_ADDR_SPACE_CONVERT
> #define TARGET_ADDR_SPACE_CONVERT ix86_addr_space_convert
>
> +static int
> +ix86_addr_space_debug (addr_space_t as)
> +{
> + /* Represent debugging for address spaces with DW_AT_segment,
> + and the dwarf register for fsbase/gsbase. */
> + if (as == ADDR_SPACE_SEG_TLS)
> + as = DEFAULT_TLS_SEG_REG;
> +
> + /* ??? These register numbers are defined in the x86-64 abi,
> + but there is no corresponding definition for the i386 abi.
> + That said, {58,59} appear to be reserved, so perhaps best
> + to use the same numbers in the 32-bit abi. */
> + if (as == ADDR_SPACE_SEG_FS)
> + return ~58; /* dwarf fsbase */
> + else if (as == ADDR_SPACE_SEG_GS)
> + return ~59; /* dwarf gsbase */
> + gcc_unreachable ();
> +}
This is wrong for i386 psABI. Please use the DWARF register
numbers listed in Table 2.14: DWARF Register Number Mapping
in Intel386 psABI:
https://github.com/hjl-tools/x86-psABI/wiki/X86-psABI
Segment Register ES 40 %es
Segment Register CS 41 %cs
Segment Register SS 42 %ss
Segment Register DS 43 %ds
Segment Register FS 44 %fs
Segment Register GS 45 %gs
--
H.J.
