diff options
| author | Alan Modra <amodra@gmail.com> | 2019-12-10 18:06:09 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2019-12-11 11:34:33 +1030 |
| commit | b8e61daa1ad56330fd8931c8a53bfa16d8e4a47a (patch) | |
| tree | ba543454bcef55c770165f89c0430044b063c24e /cpu | |
| parent | 8ff23dba80b80a9f47d75dd43812e041f6674763 (diff) | |
| download | gdb-b8e61daa1ad56330fd8931c8a53bfa16d8e4a47a.zip gdb-b8e61daa1ad56330fd8931c8a53bfa16d8e4a47a.tar.gz gdb-b8e61daa1ad56330fd8931c8a53bfa16d8e4a47a.tar.bz2 | |
ubsan: epiphany: left shift of negative value
Two places in epiphany_cgen_extract_operand, "value" is a long.
value = ((((value) << (1))) + (pc));
cpu/
* epiphany.cpu (f-simm8, f-simm24): Use multiply rather than
shift left to avoid UB on left shift of negative values.
opcodes/
* epiphany-ibld.c: Regenerate.
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/ChangeLog | 5 | ||||
| -rw-r--r-- | cpu/epiphany.cpu | 4 |
2 files changed, 7 insertions, 2 deletions
diff --git a/cpu/ChangeLog b/cpu/ChangeLog index 87cec69..fd26cb7 100644 --- a/cpu/ChangeLog +++ b/cpu/ChangeLog @@ -1,3 +1,8 @@ +2019-12-11 Alan Modra <amodra@gmail.com> + + * epiphany.cpu (f-simm8, f-simm24): Use multiply rather than + shift left to avoid UB on left shift of negative values. + 2019-11-20 Jose E. Marchesi <jose.marchesi@oracle.com> * bpf.cpu: Fix comment describing the 128-bit instruction format. diff --git a/cpu/epiphany.cpu b/cpu/epiphany.cpu index 33c81d0..9f873b3 100644 --- a/cpu/epiphany.cpu +++ b/cpu/epiphany.cpu @@ -149,11 +149,11 @@ (df f-simm8 "branch displacement" (PCREL-ADDR RELOC) 15 8 INT ((value pc) (sra SI (sub SI value pc) 1)) - ((value pc) (add SI (sll SI value 1) pc))) + ((value pc) (add SI (mul SI value 2) pc))) (df f-simm24 "branch displacement" (PCREL-ADDR RELOC) 31 24 INT ((value pc) (sra SI (sub SI value pc) 1)) - ((value pc) (add SI (sll SI value 1) pc))) + ((value pc) (add SI (mul SI value 2) pc))) (df f-sdisp3 "signed immediate 3 bit" () 9 3 INT #f #f) |