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Only save FPRs on harts that support F/D/Q #95

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Jul 21, 2017
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Only save FPRs on harts that support F/D/Q #95

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37 changes: 32 additions & 5 deletions gdb/riscv-tdep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,31 @@ set_riscv_command (char *args, int from_tty)
help_list (setriscvcmdlist, "set riscv ", all_commands, gdb_stdout);
}

static uint32_t
cached_misa ()
{
static bool read = false;
static uint32_t value = 0;

if (!read) {
struct frame_info *frame = get_current_frame ();
TRY
{
value = get_frame_register_unsigned (frame, RISCV_CSR_MISA_REGNUM);
}
CATCH (ex, RETURN_MASK_ERROR)
{
// In old cores, $misa might live at 0xf10
value = get_frame_register_unsigned (frame,
RISCV_CSR_MISA_REGNUM - 0x301 + 0xf10);
}
END_CATCH
read = true;
}

return value;
}

/* Implement the breakpoint_kind_from_pc gdbarch method. */

static int
Expand All @@ -209,8 +234,7 @@ riscv_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
/* TODO: Because we try to read misa, it is not possible to set a
breakpoint before connecting to a live target. A suggested workaround is
to look at the ELF file in this case. */
struct frame_info *frame = get_current_frame ();
uint32_t misa = get_frame_register_unsigned (frame, RISCV_CSR_MISA_REGNUM);
uint32_t misa = cached_misa();
if (misa & (1<<2))
gdbarch_tdep (gdbarch)->supports_compressed_isa = AUTO_BOOLEAN_TRUE;
else
Expand Down Expand Up @@ -731,9 +755,12 @@ riscv_register_reggroup_p (struct gdbarch *gdbarch,
|| regnum == RISCV_CSR_FRM_REGNUM);
else if (reggroup == general_reggroup)
return regnum < RISCV_FIRST_FP_REGNUM;
else if (reggroup == restore_reggroup || reggroup == save_reggroup)
return regnum <= RISCV_LAST_FP_REGNUM;
else if (reggroup == system_reggroup) {
else if (reggroup == restore_reggroup || reggroup == save_reggroup) {
if (cached_misa() & ((1<<('F'-'A')) | (1<<('D'-'A')) | (1<<('Q'-'A'))))
return regnum <= RISCV_LAST_FP_REGNUM;
else
return regnum < RISCV_FIRST_FP_REGNUM;
} else if (reggroup == system_reggroup) {
if (regnum == RISCV_PRIV_REGNUM)
return 1;
if (regnum < RISCV_FIRST_CSR_REGNUM || regnum > RISCV_LAST_CSR_REGNUM)
Expand Down