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| author | Jim Wilson <jimw@sifive.com> | 2018-10-22 14:11:55 -0700 |
|---|---|---|
| committer | Jim Wilson <jimw@sifive.com> | 2018-10-22 14:11:55 -0700 |
| commit | 3399f1b3030c3419859f1230bc66a981154d176d (patch) | |
| tree | b7d536584900106fdb6de5d02adc331ac8b48c1e /gdb/riscv-tdep.c | |
| parent | 270b9329b713fdc166f95dfa3a0a2f72f3a49608 (diff) | |
| download | gdb-3399f1b3030c3419859f1230bc66a981154d176d.zip gdb-3399f1b3030c3419859f1230bc66a981154d176d.tar.gz gdb-3399f1b3030c3419859f1230bc66a981154d176d.tar.bz2 | |
RISC-V: NaN-box FP values smaller than an FP register.
The hardware requires that values in FP registers be NaN-boxed, so we must
extend them with 1's instead of 0's as we do for integer values.
gdb/
* riscv-tdep.c (riscv_push_dummy_call) <in_reg>: Check for value in
FP reg smaller than FP reg size, and fill with -1 instead of 0.
Diffstat (limited to 'gdb/riscv-tdep.c')
| -rw-r--r-- | gdb/riscv-tdep.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/gdb/riscv-tdep.c b/gdb/riscv-tdep.c index 1a75788..dd80f95 100644 --- a/gdb/riscv-tdep.c +++ b/gdb/riscv-tdep.c @@ -2408,7 +2408,12 @@ riscv_push_dummy_call (struct gdbarch *gdbarch, gdb_byte tmp [sizeof (ULONGEST)]; gdb_assert (info->argloc[0].c_length <= info->length); - memset (tmp, 0, sizeof (tmp)); + /* FP values in FP registers must be NaN-boxed. */ + if (riscv_is_fp_regno_p (info->argloc[0].loc_data.regno) + && info->argloc[0].c_length < call_info.flen) + memset (tmp, -1, sizeof (tmp)); + else + memset (tmp, 0, sizeof (tmp)); memcpy (tmp, info->contents, info->argloc[0].c_length); regcache->cooked_write (info->argloc[0].loc_data.regno, tmp); second_arg_length = @@ -2447,7 +2452,12 @@ riscv_push_dummy_call (struct gdbarch *gdbarch, gdb_assert ((riscv_is_fp_regno_p (info->argloc[1].loc_data.regno) && second_arg_length <= call_info.flen) || second_arg_length <= call_info.xlen); - memset (tmp, 0, sizeof (tmp)); + /* FP values in FP registers must be NaN-boxed. */ + if (riscv_is_fp_regno_p (info->argloc[1].loc_data.regno) + && second_arg_length < call_info.flen) + memset (tmp, -1, sizeof (tmp)); + else + memset (tmp, 0, sizeof (tmp)); memcpy (tmp, second_arg_data, second_arg_length); regcache->cooked_write (info->argloc[1].loc_data.regno, tmp); } |