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Re: [PATCH] RISC-V: Add FP register core file support.
- From: Andrew Burgess <andrew dot burgess at embecosm dot com>
- To: Jim Wilson <jimw at sifive dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Fri, 8 Feb 2019 10:31:55 +0000
- Subject: Re: [PATCH] RISC-V: Add FP register core file support.
- References: <20190206182424.2868-1-jimw@sifive.com>
* Jim Wilson <jimw@sifive.com> [2019-02-06 10:24:24 -0800]:
> This adds fp reg support similar to the existing general reg support.
>
> This fixes one gdb testsuite failure
> FAIL: gdb.base/gcore.exp: corefile restored system registers
> which fails without the patch because fcsr was missing. Otherwise, no
> regressions with riscv64-linux native testsuite run.
>
> gdb/
> * riscv-linux-tdep.c (riscv_linux_fregmap): New.
> (riscv_linux_fregset): New.
> (riscv_linux_iterate_over_regset_sections): Call cb for .reg2
> section.
Looks good to me.
Thanks,
Andrew
> ---
> gdb/riscv-linux-tdep.c | 23 +++++++++++++++++++++--
> 1 file changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/gdb/riscv-linux-tdep.c b/gdb/riscv-linux-tdep.c
> index e1f8e76567..91061c5b3e 100644
> --- a/gdb/riscv-linux-tdep.c
> +++ b/gdb/riscv-linux-tdep.c
> @@ -37,6 +37,16 @@ static const struct regcache_map_entry riscv_linux_gregmap[] =
> { 0 }
> };
>
> +/* Define the FP register mapping. The kernel puts the 32 FP regs first, and
> + then FCSR. */
> +
> +static const struct regcache_map_entry riscv_linux_fregmap[] =
> +{
> + { 32, RISCV_FIRST_FP_REGNUM, 0 },
> + { 1, RISCV_CSR_FCSR_REGNUM, 0 },
> + { 0 }
> +};
> +
> /* Define the general register regset. */
>
> static const struct regset riscv_linux_gregset =
> @@ -44,6 +54,13 @@ static const struct regset riscv_linux_gregset =
> riscv_linux_gregmap, regcache_supply_regset, regcache_collect_regset
> };
>
> +/* Define the FP register regset. */
> +
> +static const struct regset riscv_linux_fregset =
> +{
> + riscv_linux_fregmap, regcache_supply_regset, regcache_collect_regset
> +};
> +
> /* Define hook for core file support. */
>
> static void
> @@ -54,8 +71,10 @@ riscv_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
> {
> cb (".reg", (32 * riscv_isa_xlen (gdbarch)), (32 * riscv_isa_xlen (gdbarch)),
> &riscv_linux_gregset, NULL, cb_data);
> -
> - /* TODO: Add FP register support. */
> + /* The kernel is adding 8 bytes for FCSR. */
> + cb (".reg2", (32 * riscv_isa_flen (gdbarch)) + 8,
> + (32 * riscv_isa_flen (gdbarch)) + 8,
> + &riscv_linux_fregset, NULL, cb_data);
> }
>
> /* Signal trampoline support. */
> --
> 2.17.1
>