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ubsan: nds32: left shift cannot be represented in type 'int'

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Note that using 1u in N32_BIT makes all of N32_BIT, __MASK, __MF, __GF
and __SEXT evaluate as unsigned int (the latter three when when their
v arg is int or smaller).  This would be a problem if assigning the
result to a bfd_vma, long, or other type wider than an int since the
__SEXT result would be zero extended to the wider type.  Fortunately
nds32 target code doesn't use wider types unnecessarily.

include/
	* opcode/nds32.h (N32_BIT): Define using 1u.
	(__SEXT): Use __MASK and N32_BIT.
	(N32_IMMS): Remove duplicate mask.
opcodes/
	* nds32-dis.c (print_insn16, print_insn32): Remove forward decls.
	(struct objdump_disasm_info): Delete.
	(nds32_parse_audio_ext, nds32_parse_opcode): Cast result of
	N32_IMMS to unsigned before shifting left.
This commit is contained in:
Alan Modra
2019-12-16 09:35:30 +10:30
parent cf950fd4dd
commit 4bdb25fe69
4 changed files with 25 additions and 26 deletions
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7
include/opcode/nds32.h
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@ -51,11 +51,12 @@ static const int nds32_r54map[] ATTRIBUTE_UNUSED =
-1, -1, -1, -1, -1, -1, -1, -1
};
#define N32_BIT(n) (1 << (n))
#define N32_BIT(n) (1u << (n))
#define __MASK(n) (N32_BIT (n) - 1)
#define __MF(v, off, bs) (((v) & __MASK (bs)) << (off))
#define __GF(v, off, bs) (((v) >> off) & __MASK (bs))
#define __SEXT(v, bs) ((((v) & ((1 << (bs)) - 1)) ^ (1 << ((bs) - 1))) - (1 << ((bs) - 1)))
#define __SEXT(v, bs) \
((((v) & __MASK ((bs))) ^ N32_BIT ((bs) - 1)) - N32_BIT ((bs) - 1))
/* Make nds32 instructions. */
@ -150,7 +151,7 @@ static const int nds32_r54map[] ATTRIBUTE_UNUSED =
#define N32_SUB6(insn) (((insn) >> 0) & 0x3f)
#define N32_SWID(insn) (((insn) >> 5) & 0x3ff)
#define N32_IMMU(insn, bs) ((insn) & __MASK (bs))
#define N32_IMMS(insn, bs) ((signed) __SEXT (((insn) & __MASK (bs)), bs))
#define N32_IMMS(insn, bs) ((signed) __SEXT ((insn), (bs)))
#define N32_IMM5U(insn) N32_IMMU (insn, 5)
#define N32_IMM12S(insn) N32_IMMS (insn, 12)
#define N32_IMM14S(insn) N32_IMMS (insn, 14)