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Message-ID: <9978fdbbd580fb60693607981c75ffdf@208suo.com>
Date: Wed, 14 Jun 2023 13:48:47 +0800
From: wuyonggang001@...suo.com
To: npiggin@...il.com, mpe@...erman.id.au
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/xmon: Fix comparing pointer
Fix the following coccicheck warning:
arch/powerpc/xmon/spu-dis.c:51:34-35: WARNING comparing pointer to 0
Signed-off-by: Yonggang Wu <wuyonggang001@...suo.com>
---
arch/powerpc/xmon/spu-dis.c | 384 ++++++++++++++++++------------------
1 file changed, 193 insertions(+), 191 deletions(-)
diff --git a/arch/powerpc/xmon/spu-dis.c b/arch/powerpc/xmon/spu-dis.c
index 4b0a4e640f08..f48a2ddd7440 100644
--- a/arch/powerpc/xmon/spu-dis.c
+++ b/arch/powerpc/xmon/spu-dis.c
@@ -22,216 +22,218 @@ extern const int spu_num_opcodes;
#define SPU_DISASM_TBL_SIZE (1 << 11)
static const struct spu_opcode
*spu_disassemble_table[SPU_DISASM_TBL_SIZE];
-static void
-init_spu_disassemble (void)
+static void init_spu_disassemble(void)
{
- int i;
-
- /* If two instructions have the same opcode then we prefer the first
- * one. In most cases it is just an alternate mnemonic. */
- for (i = 0; i < spu_num_opcodes; i++)
- {
- int o = spu_opcodes[i].opcode;
- if (o >= SPU_DISASM_TBL_SIZE)
- continue; /* abort (); */
- if (spu_disassemble_table[o] == 0)
- spu_disassemble_table[o] = &spu_opcodes[i];
- }
+ int i;
+
+ /*
+ * If two instructions have the same opcode then we prefer the
first
+ * one. In most cases it is just an alternate mnemonic.
+ */
+ for (i = 0; i < spu_num_opcodes; i++) {
+ int o = spu_opcodes[i].opcode;
+
+ if (o >= SPU_DISASM_TBL_SIZE)
+ continue; /* abort(); */
+ if (spu_disassemble_table[o] == NULL)
+ spu_disassemble_table[o] = &spu_opcodes[i];
+ }
}
/* Determine the instruction from the 10 least significant bits. */
-static const struct spu_opcode *
-get_index_for_opcode (unsigned int insn)
+static const struct spu_opcode *get_index_for_opcode(unsigned int insn)
{
- const struct spu_opcode *index;
- unsigned int opcode = insn >> (32-11);
-
- /* Init the table. This assumes that element 0/opcode 0 (currently
- * NOP) is always used */
- if (spu_disassemble_table[0] == 0)
- init_spu_disassemble ();
-
- if ((index = spu_disassemble_table[opcode & 0x780]) != 0
- && index->insn_type == RRR)
- return index;
-
- if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0
- && (index->insn_type == RI18 || index->insn_type == LBT))
- return index;
-
- if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0
- && index->insn_type == RI10)
- return index;
-
- if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0
- && (index->insn_type == RI16))
- return index;
-
- if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0
- && (index->insn_type == RI8))
- return index;
-
- if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)
- return index;
-
- return NULL;
+ const struct spu_opcode *index;
+ unsigned int opcode = insn >> (32-11);
+
+ /*
+ * Init the table. This assumes that element 0/opcode 0 (currently
+ * NOP) is always used
+ */
+ if (spu_disassemble_table[0] == NULL)
+ init_spu_disassemble();
+
+ index = spu_disassemble_table[opcode & 0x780];
+ if (index != NULL && index->insn_type == RRR)
+ return index;
+
+ index = spu_disassemble_table[opcode & 0x7f0];
+ if (index != NULL
+ && (index->insn_type == RI18 || index->insn_type == LBT))
+ return index;
+
+ index = spu_disassemble_table[opcode & 0x7f8];
+ if (index != NULL
+ && index->insn_type == RI10)
+ return index;
+
+ index = spu_disassemble_table[opcode & 0x7fc]
+ if (index != NULL && (index->insn_type == RI16))
+ return index;
+
+ index = spu_disassemble_table[opcode & 0x7fe];
+ if (index != NULL && (index->insn_type == RI8))
+ return index;
+
+ index = spu_disassemble_table[opcode & 0x7ff];
+ if (index != NULL)
+ return index;
+
+ return NULL;
}
/* Print a Spu instruction. */
-int
-print_insn_spu (unsigned long insn, unsigned long memaddr)
+int print_insn_spu(unsigned long insn, unsigned long memaddr)
{
- int value;
- int hex_value;
- const struct spu_opcode *index;
- enum spu_insns tag;
+ int value;
+ int hex_value;
+ const struct spu_opcode *index;
+ enum spu_insns tag;
- index = get_index_for_opcode (insn);
+ index = get_index_for_opcode(insn);
- if (index == 0)
- {
- printf(".long 0x%lx", insn);
- }
- else
- {
- int i;
- int paren = 0;
- tag = (enum spu_insns)(index - spu_opcodes);
- printf("%s", index->mnemonic);
- if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag ==
M_BISLED
- || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag ==
M_BIZ
- || tag == M_SYNC || tag == M_HBR)
+ if (index == NULL)
{
- int fb = (insn >> (32-18)) & 0x7f;
- if (fb & 0x40)
- printf(tag == M_SYNC ? "c" : "p");
- if (fb & 0x20)
- printf("d");
- if (fb & 0x10)
- printf("e");
- }
- if (index->arg[0] != 0)
- printf("\t");
- hex_value = 0;
- for (i = 1; i <= index->arg[0]; i++)
+ printf(".long 0x%lx", insn);
+ } else
{
- int arg = index->arg[i];
- if (arg != A_P && !paren && i > 1)
- printf(",");
-
- switch (arg)
- {
- case A_T:
- printf("$%lu",
- DECODE_INSN_RT (insn));
- break;
- case A_A:
- printf("$%lu",
- DECODE_INSN_RA (insn));
- break;
- case A_B:
- printf("$%lu",
- DECODE_INSN_RB (insn));
- break;
- case A_C:
- printf("$%lu",
- DECODE_INSN_RC (insn));
- break;
- case A_S:
- printf("$sp%lu",
- DECODE_INSN_RA (insn));
- break;
- case A_H:
- printf("$ch%lu",
- DECODE_INSN_RA (insn));
- break;
- case A_P:
- paren++;
- printf("(");
- break;
- case A_U7A:
- printf("%lu",
- 173 - DECODE_INSN_U8 (insn));
- break;
- case A_U7B:
- printf("%lu",
- 155 - DECODE_INSN_U8 (insn));
- break;
- case A_S3:
- case A_S6:
- case A_S7:
- case A_S7N:
- case A_U3:
- case A_U5:
- case A_U6:
- case A_U7:
- hex_value = DECODE_INSN_I7 (insn);
- printf("%d", hex_value);
- break;
- case A_S11:
- print_address(memaddr + DECODE_INSN_I9a (insn) * 4);
- break;
- case A_S11I:
- print_address(memaddr + DECODE_INSN_I9b (insn) * 4);
- break;
- case A_S10:
- case A_S10B:
- hex_value = DECODE_INSN_I10 (insn);
- printf("%d", hex_value);
- break;
- case A_S14:
- hex_value = DECODE_INSN_I10 (insn) * 16;
- printf("%d", hex_value);
- break;
- case A_S16:
- hex_value = DECODE_INSN_I16 (insn);
- printf("%d", hex_value);
- break;
- case A_X16:
- hex_value = DECODE_INSN_U16 (insn);
- printf("%u", hex_value);
- break;
- case A_R18:
- value = DECODE_INSN_I16 (insn) * 4;
- if (value == 0)
- printf("%d", value);
- else
+ int i;
+ int paren = 0;
+
+ tag = (enum spu_insns)(index - spu_opcodes);
+
+ printf("%s", index->mnemonic);
+ if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag ==
M_BISLED
+ || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag ==
M_BIZ
+ || tag == M_SYNC || tag == M_HBR)
{
- hex_value = memaddr + value;
- print_address(hex_value & 0x3ffff);
+ int fb = (insn >> (32-18)) & 0x7f;
+
+ if (fb & 0x40)
+ printf(tag == M_SYNC ? "c" : "p");
+ if (fb & 0x20)
+ printf("d");
+ if (fb & 0x10)
+ printf("e");
}
- break;
- case A_S18:
- value = DECODE_INSN_U16 (insn) * 4;
- if (value == 0)
- printf("%d", value);
- else
- print_address(value);
- break;
- case A_U18:
- value = DECODE_INSN_U18 (insn);
- if (value == 0 || 1)
+ if (index->arg[0] != 0)
+ printf("\t");
+ hex_value = 0;
+ for (i = 1; i <= index->arg[0]; i++) {
+ int arg = index->arg[i];
+
+ if (arg != A_P && !paren && i > 1)
+ printf(",");
+
+ switch (arg) {
+ case A_T:
+ printf("$%lu",
+ DECODE_INSN_RT(insn));
+ break;
+ case A_A:
+ printf("$%lu",
+ DECODE_INSN_RA(insn));
+ break;
+ case A_B:
+ printf("$%lu",
+ DECODE_INSN_RB(insn));
+ break;
+ case A_C:
+ printf("$%lu",
+ DECODE_INSN_RC(insn));
+ break;
+ case A_S:
+ printf("$sp%lu",
+ DECODE_INSN_RA(insn));
+ break;
+ case A_H:
+ printf("$ch%lu",
+ DECODE_INSN_RA(insn));
+ break;
+ case A_P:
+ paren++;
+ printf("(");
+ break;
+ case A_U7A:
+ printf("%lu",
+ 173 - DECODE_INSN_U8(insn));
+ break;
+ case A_U7B:
+ printf("%lu",
+ 155 - DECODE_INSN_U8(insn));
+ break;
+ case A_S3:
+ case A_S6:
+ case A_S7:
+ case A_S7N:
+ case A_U3:
+ case A_U5:
+ case A_U6:
+ case A_U7:
+ hex_value = DECODE_INSN_I7(insn);
+ printf("%d", hex_value);
+ break;
+ case A_S11:
+ print_address(memaddr + DECODE_INSN_I9a(insn) * 4);
+ break;
+ case A_S11I:
+ print_address(memaddr + DECODE_INSN_I9b(insn) * 4);
+ break;
+ case A_S10:
+ case A_S10B:
+ hex_value = DECODE_INSN_I10(insn);
+ printf("%d", hex_value);
+ break;
+ case A_S14:
+ hex_value = DECODE_INSN_I10(insn) * 16;
+ printf("%d", hex_value);
+ break;
+ case A_S16:
+ hex_value = DECODE_INSN_I16(insn);
+ printf("%d", hex_value);
+ break;
+ case A_X16:
+ hex_value = DECODE_INSN_U16(insn);
+ printf("%u", hex_value);
+ break;
+ case A_R18:
+ value = DECODE_INSN_I16(insn) * 4;
+ if (value == 0)
+ printf("%d", value);
+ else {
+ hex_value = memaddr + value;
+ print_address(hex_value & 0x3ffff);
+ }
+ break;
+ case A_S18:
+ value = DECODE_INSN_U16(insn) * 4;
+ if (value == 0)
+ printf("%d", value);
+ else
+ print_address(value);
+ break;
+ case A_U18:
+ value = DECODE_INSN_U18(insn);
+ if (value == 0 || 1) {
+ hex_value = value;
+ printf("%u", value);
+ } else
+ print_address(value);
+ break;
+ case A_U14:
+ hex_value = DECODE_INSN_U14(insn);
+ printf("%u", hex_value);
+ break;
+ }
+ if (arg != A_P && paren)
{
- hex_value = value;
- printf("%u", value);
+ printf(")");
+ paren--;
}
- else
- print_address(value);
- break;
- case A_U14:
- hex_value = DECODE_INSN_U14 (insn);
- printf("%u", hex_value);
- break;
- }
- if (arg != A_P && paren)
- {
- printf(")");
- paren--;
- }
}
- if (hex_value > 16)
- printf("\t# %x", hex_value);
+ if (hex_value > 16)
+ printf("\t# %x", hex_value);
}
return 4;
}
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