From 207cc92d92c863298c530498e2dbf71a2b5fd8ae Mon Sep 17 00:00:00 2001 From: Li Xu Date: Wed, 14 Dec 2022 07:32:40 +0000 Subject: RISC-V: Add string length check for operands in AS The current AS accepts invalid operands due to miss of operands length check. For example, "e6" is an invalid operand in (vsetvli a0, a1, e6, mf8, tu, ma), but it's still accepted by assembler. In detail, the condition check "strncmp (array[i], *s, len) == 0" in arg_lookup function passes with "strncmp ("e64", "e6", 2)" in the case above. So the generated encoding is same as that of (vsetvli a0, a1, e64, mf8, tu, ma). This patch fixes issue above by prompting an error in such case and also adds a new testcase. gas/ChangeLog: * config/tc-riscv.c (arg_lookup): Add string length check for operands. * testsuite/gas/riscv/vector-insns-fail-vsew.d: New testcase for an illegal vsew. * testsuite/gas/riscv/vector-insns-fail-vsew.l: Likewise. * testsuite/gas/riscv/vector-insns-fail-vsew.s: Likewise. --- gas/config/tc-riscv.c | 3 ++- gas/testsuite/gas/riscv/vector-insns-fail-vsew.d | 3 +++ gas/testsuite/gas/riscv/vector-insns-fail-vsew.l | 3 +++ gas/testsuite/gas/riscv/vector-insns-fail-vsew.s | 1 + 4 files changed, 9 insertions(+), 1 deletion(-) create mode 100644 gas/testsuite/gas/riscv/vector-insns-fail-vsew.d create mode 100644 gas/testsuite/gas/riscv/vector-insns-fail-vsew.l create mode 100644 gas/testsuite/gas/riscv/vector-insns-fail-vsew.s (limited to 'gas') diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c index 0682eb3..77c0d2e 100644 --- a/gas/config/tc-riscv.c +++ b/gas/config/tc-riscv.c @@ -1206,7 +1206,8 @@ arg_lookup (char **s, const char *const *array, size_t size, unsigned *regnop) return false; for (i = 0; i < size; i++) - if (array[i] != NULL && strncmp (array[i], *s, len) == 0) + if (array[i] != NULL && strncmp (array[i], *s, len) == 0 + && array[i][len] == '\0') { *regnop = i; *s += len; diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d new file mode 100644 index 0000000..e0354d1 --- /dev/null +++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d @@ -0,0 +1,3 @@ +#as: -march=rv32iv +#source: vector-insns-fail-vsew.s +#error_output: vector-insns-fail-vsew.l diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l new file mode 100644 index 0000000..87a2c22 --- /dev/null +++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l @@ -0,0 +1,3 @@ +.*: Assembler messages: +.*: Error: instruction vsetvli requires absolute expression +.*: Error: illegal operands `vsetvli a0,a1,e6,mf8,tu,ma' diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s new file mode 100644 index 0000000..b8f3242 --- /dev/null +++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s @@ -0,0 +1 @@ + vsetvli a0, a1, e6, mf8, tu, ma # unrecognized vsew -- cgit v1.1