redonkable/alistair23-linux
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[S390] Fix disassembly of RX_URRD, SI_URD & PC-relative instructions.

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The instructions with format RX_URRD and SI_URD and instructions
with a PC relative operand are not disassembled correctly.
For RX_URRD and SI_URD instructions find_insn sets opfrag to code[0].
The mask byte of these two formats is 0x00. table->opfrag will never
be identical to (opfrag & opmask) and no matching instruction will
be found. Set the mask byte to 0xff to actually check byte 0 against
the table.
For PC relative instructions the (unsigned) offset value needs to be
casted to an signed integer so that negative branch offsets are
handled correctly.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2007-07-17 13:36:03 +02:00 committed by Martin Schwidefsky
parent a13a9b6d98
commit 92d154b6c5
1 changed files with 4 additions and 3 deletions
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7
arch/s390/kernel/dis.c
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@ -240,8 +240,8 @@ static const unsigned char formats[][7] = {
[INSTR_RXY_FRRD] = { 0xff, F_8,D20_20,X_12,B_16,0,0 },/* e.g. ley */
[INSTR_RX_FRRD] = { 0xff, F_8,D_20,X_12,B_16,0,0 }, /* e.g. ae */
[INSTR_RX_RRRD] = { 0xff, R_8,D_20,X_12,B_16,0,0 }, /* e.g. l */
[INSTR_RX_URRD] = { 0x00, U4_8,D_20,X_12,B_16,0,0 }, /* e.g. bc */
[INSTR_SI_URD] = { 0x00, D_20,B_16,U8_8,0,0,0 }, /* e.g. cli */
[INSTR_RX_URRD] = { 0xff, U4_8,D_20,X_12,B_16,0,0 }, /* e.g. bc */
[INSTR_SI_URD] = { 0xff, D_20,B_16,U8_8,0,0,0 }, /* e.g. cli */
[INSTR_SIY_URD] = { 0xff, D20_20,B_16,U8_8,0,0,0 }, /* e.g. tmy */
[INSTR_SSE_RDRD] = { 0xff, D_20,B_16,D_36,B_32,0,0 }, /* e.g. mvsdk */
[INSTR_SS_L0RDRD] = { 0xff, D_20,L8_8,B_16,D_36,B_32,0 },
@ -1190,7 +1190,8 @@ static int print_insn(char *buffer, unsigned char *code, unsigned long addr)
else if (operand->flags & OPERAND_CR)
ptr += sprintf(ptr, "%%c%i", value);
else if (operand->flags & OPERAND_PCREL)
ptr += sprintf(ptr, "%lx", value + addr);
ptr += sprintf(ptr, "%lx", (signed int) value
+ addr);
else if (operand->flags & OPERAND_SIGNED)
ptr += sprintf(ptr, "%i", value);
else