Re: H8300 use of uninitialised value
This patch also had some problems. Calculation of maxlen was wrong, and the insn arg loop needed rearranging to work with a correct length. * disassemble.h (opcodes_assert): Declare. (OPCODES_ASSERT): Define. * disassemble.c: Don't include assert.h. Include opintl.h. (opcodes_assert): New function. * h8300-dis.c (bfd_h8_disassemble_init): Use OPCODES_ASSERT. (bfd_h8_disassemble): Reduce size of data array. Correctly calculate maxlen. Omit insn decoding when insn length exceeds maxlen. Exit from nibble loop when looking for E, before accessing next data byte. Move processing of E outside loop. Replace tests of maxlen in loop with assertions.
This commit is contained in:
Alan Modra
parent
ff76851054
commit
832a580781
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@ -1,3 +1,16 @@
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2020-03-26 Alan Modra <amodra@gmail.com>
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* disassemble.h (opcodes_assert): Declare.
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(OPCODES_ASSERT): Define.
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* disassemble.c: Don't include assert.h. Include opintl.h.
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(opcodes_assert): New function.
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* h8300-dis.c (bfd_h8_disassemble_init): Use OPCODES_ASSERT.
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(bfd_h8_disassemble): Reduce size of data array. Correctly
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calculate maxlen. Omit insn decoding when insn length exceeds
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maxlen. Exit from nibble loop when looking for E, before
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accessing next data byte. Move processing of E outside loop.
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Replace tests of maxlen in loop with assertions.
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2020-03-26 Alan Modra <amodra@gmail.com>
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* arc-dis.c (find_format): Init needs_limm. Simplify use of limm.
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@ -21,7 +21,7 @@
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#include "sysdep.h"
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#include "disassemble.h"
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#include "safe-ctype.h"
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#include <assert.h>
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#include "opintl.h"
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#ifdef ARCH_all
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#define ARCH_aarch64
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@ -832,3 +832,11 @@ disassembler_options_cmp (const char *s1, const char *s2)
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return c1 - c2;
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}
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void
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opcodes_assert (const char *file, int line)
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{
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opcodes_error_handler (_("assertion fail %s:%d"), file, line);
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opcodes_error_handler (_("Please report this bug"));
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abort ();
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}
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@ -103,4 +103,10 @@ extern int print_insn_z8002 (bfd_vma, disassemble_info *);
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extern disassembler_ftype csky_get_disassembler (bfd *);
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extern disassembler_ftype rl78_get_disassembler (bfd *);
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extern void ATTRIBUTE_NORETURN opcodes_assert (const char *, int);
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#define OPCODES_ASSERT(x) \
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do { if (!(x)) opcodes_assert (__FILE__, __LINE__); } while (0)
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#endif /* DISASSEMBLE_H */
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@ -29,7 +29,7 @@
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struct h8_instruction
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{
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int length;
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unsigned int length;
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const struct h8_opcode *opcode;
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};
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@ -56,13 +56,7 @@ bfd_h8_disassemble_init (void)
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that the count is the same as the length. */
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for (i = 0; p->data.nib[i] != (op_type) E; i++)
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;
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if (i & 1)
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{
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/* xgettext:c-format */
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opcodes_error_handler (_("internal error, h8_disassemble_init"));
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abort ();
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}
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OPCODES_ASSERT (!(i & 1));
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pi->length = i / 2;
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pi->opcode = p;
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@ -328,7 +322,7 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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char const **pregnames = mach != 0 ? lregnames : wregnames;
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int status;
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unsigned int maxlen;
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unsigned char data[MAX_CODE_NIBBLES];
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unsigned char data[MAX_CODE_NIBBLES / 2];
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void *stream = info->stream;
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fprintf_ftype outfn = info->fprintf_func;
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@ -345,22 +339,34 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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return -1;
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}
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for (maxlen = 2; status == 0 && maxlen < sizeof (data) / 2; maxlen += 2)
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status = info->read_memory_func (addr + maxlen, data + maxlen, 2, info);
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for (maxlen = 2; maxlen < sizeof (data); maxlen += 2)
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{
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status = info->read_memory_func (addr + maxlen, data + maxlen, 2, info);
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if (status != 0)
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break;
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}
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/* Find the exact opcode/arg combo. */
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for (qi = h8_instructions; qi->opcode->name; qi++)
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{
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const struct h8_opcode *q = qi->opcode;
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const op_type *nib = q->data.nib;
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unsigned int len = 0;
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const struct h8_opcode *q;
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const op_type *nib;
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unsigned int len;
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op_type looking_for;
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while (len / 2 < maxlen)
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if (qi->length > maxlen)
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continue;
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q = qi->opcode;
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nib = q->data.nib;
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len = 0;
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while ((looking_for = *nib) != (op_type) E)
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{
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op_type looking_for = *nib;
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int thisnib = data[len / 2];
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int thisnib;
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int opnr;
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OPCODES_ASSERT (len / 2 < maxlen);
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thisnib = data[len / 2];
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thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib / 16) & 0xf);
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opnr = ((looking_for & OP3) == OP3 ? 2
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: (looking_for & DST) == DST ? 1 : 0);
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@ -476,8 +482,7 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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extra = 0;
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break;
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}
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if (len / 2 + extra >= maxlen)
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break;
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OPCODES_ASSERT (len / 2 + extra < maxlen);
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extract_immediate (stream, looking_for, thisnib,
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data + len / 2, cst + opnr,
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cstlen + opnr, q);
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@ -532,8 +537,7 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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else if ((looking_for & SIZE) == L_16
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|| (looking_for & SIZE) == L_16U)
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{
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if (len / 2 + 1 >= maxlen)
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break;
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OPCODES_ASSERT (len / 2 + 1 < maxlen);
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cst[opnr] = (data[len / 2]) * 256 + data[(len + 2) / 2];
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cstlen[opnr] = 16;
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}
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@ -549,8 +553,7 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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{
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unsigned int i = len / 2;
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if (i + 3 >= maxlen)
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break;
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OPCODES_ASSERT (i + 3 < maxlen);
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cst[opnr] = (((unsigned) data[i] << 24)
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| (data[i + 1] << 16)
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| (data[i + 2] << 8)
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@ -562,8 +565,7 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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{
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unsigned int i = len / 2;
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if (i + 2 >= maxlen)
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break;
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OPCODES_ASSERT (i + 2 < maxlen);
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cst[opnr] =
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(data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
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cstlen[opnr] = 24;
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@ -610,105 +612,6 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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{
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cst[opnr] = (thisnib == 3);
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}
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else if (looking_for == (op_type) E)
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{
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outfn (stream, "%s\t", q->name);
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/* Gross. Disgusting. */
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if (strcmp (q->name, "ldm.l") == 0)
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{
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int count, high;
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count = (data[1] / 16) & 0x3;
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high = regno[1];
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outfn (stream, "@sp+,er%d-er%d", high - count, high);
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return qi->length;
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}
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if (strcmp (q->name, "stm.l") == 0)
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{
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int count, low;
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count = (data[1] / 16) & 0x3;
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low = regno[0];
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outfn (stream, "er%d-er%d,@-sp", low, low + count);
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return qi->length;
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}
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if (strcmp (q->name, "rte/l") == 0
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|| strcmp (q->name, "rts/l") == 0)
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{
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if (regno[0] == 0)
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outfn (stream, "er%d", regno[1]);
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else
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outfn (stream, "er%d-er%d", regno[1] - regno[0],
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regno[1]);
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return qi->length;
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}
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if (CONST_STRNEQ (q->name, "mova"))
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{
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const op_type *args = q->args.nib;
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if (args[1] == (op_type) E)
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{
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/* Short form. */
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print_one_arg (info, addr, args[0], cst[0],
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cstlen[0], dispregno[0], regno[0],
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pregnames, qi->length);
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outfn (stream, ",er%d", dispregno[0]);
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}
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else
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{
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outfn (stream, "@(0x%x:%d,", cst[0], cstlen[0]);
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print_one_arg (info, addr, args[1], cst[1],
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cstlen[1], dispregno[1], regno[1],
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pregnames, qi->length);
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outfn (stream, ".%c),",
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(args[0] & MODE) == INDEXB ? 'b' : 'w');
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print_one_arg (info, addr, args[2], cst[2],
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cstlen[2], dispregno[2], regno[2],
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pregnames, qi->length);
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}
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return qi->length;
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}
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/* Fill in the args. */
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{
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const op_type *args = q->args.nib;
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int hadone = 0;
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int nargs;
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/* Special case handling for the adds and subs instructions
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since in H8 mode thay can only take the r0-r7 registers
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but in other (higher) modes they can take the er0-er7
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registers as well. */
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if (strcmp (qi->opcode->name, "adds") == 0
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|| strcmp (qi->opcode->name, "subs") == 0)
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{
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outfn (stream, "#%d,%s", cst[0], pregnames[regno[1] & 0x7]);
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return qi->length;
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}
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for (nargs = 0;
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nargs < 3 && args[nargs] != (op_type) E;
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nargs++)
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{
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int x = args[nargs];
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if (hadone)
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outfn (stream, ",");
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print_one_arg (info, addr, x,
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cst[nargs], cstlen[nargs],
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dispregno[nargs], regno[nargs],
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pregnames, qi->length);
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hadone = 1;
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}
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}
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return qi->length;
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}
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else
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/* xgettext:c-format */
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outfn (stream, _("Don't understand 0x%x \n"), looking_for);
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@ -718,6 +621,102 @@ bfd_h8_disassemble (bfd_vma addr, disassemble_info *info, int mach)
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nib++;
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}
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outfn (stream, "%s\t", q->name);
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/* Gross. Disgusting. */
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if (strcmp (q->name, "ldm.l") == 0)
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{
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int count, high;
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count = (data[1] / 16) & 0x3;
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high = regno[1];
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outfn (stream, "@sp+,er%d-er%d", high - count, high);
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return qi->length;
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}
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if (strcmp (q->name, "stm.l") == 0)
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{
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int count, low;
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count = (data[1] / 16) & 0x3;
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low = regno[0];
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outfn (stream, "er%d-er%d,@-sp", low, low + count);
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return qi->length;
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}
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if (strcmp (q->name, "rte/l") == 0
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|| strcmp (q->name, "rts/l") == 0)
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{
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if (regno[0] == 0)
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outfn (stream, "er%d", regno[1]);
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else
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outfn (stream, "er%d-er%d", regno[1] - regno[0],
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regno[1]);
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return qi->length;
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}
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if (CONST_STRNEQ (q->name, "mova"))
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{
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const op_type *args = q->args.nib;
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if (args[1] == (op_type) E)
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{
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/* Short form. */
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print_one_arg (info, addr, args[0], cst[0],
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cstlen[0], dispregno[0], regno[0],
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pregnames, qi->length);
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outfn (stream, ",er%d", dispregno[0]);
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}
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else
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{
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outfn (stream, "@(0x%x:%d,", cst[0], cstlen[0]);
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print_one_arg (info, addr, args[1], cst[1],
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cstlen[1], dispregno[1], regno[1],
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pregnames, qi->length);
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outfn (stream, ".%c),",
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(args[0] & MODE) == INDEXB ? 'b' : 'w');
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print_one_arg (info, addr, args[2], cst[2],
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cstlen[2], dispregno[2], regno[2],
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pregnames, qi->length);
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}
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return qi->length;
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}
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/* Fill in the args. */
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{
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const op_type *args = q->args.nib;
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int hadone = 0;
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int nargs;
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/* Special case handling for the adds and subs instructions
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since in H8 mode thay can only take the r0-r7 registers
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but in other (higher) modes they can take the er0-er7
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registers as well. */
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if (strcmp (qi->opcode->name, "adds") == 0
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|| strcmp (qi->opcode->name, "subs") == 0)
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{
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outfn (stream, "#%d,%s", cst[0], pregnames[regno[1] & 0x7]);
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return qi->length;
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}
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for (nargs = 0;
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nargs < 3 && args[nargs] != (op_type) E;
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nargs++)
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{
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int x = args[nargs];
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if (hadone)
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outfn (stream, ",");
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print_one_arg (info, addr, x,
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cst[nargs], cstlen[nargs],
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dispregno[nargs], regno[nargs],
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pregnames, qi->length);
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hadone = 1;
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}
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}
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return qi->length;
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fail:
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;
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}
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