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ce59a299cb
Add required zlib_deflate parts based on kernel zlib code in preparation to DASD dumper DFLTCC deflate exploitation. Omit inflate modules in order to minimize the dumper size (no decompression is required for the dumping). Adjust include statements leaving other code as is. Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
// SPDX-License-Identifier: Zlib
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#ifndef DFLTCC_UTIL_H
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#define DFLTCC_UTIL_H
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#include <stddef.h>
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#include "zlib/zutil.h"
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/*
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* C wrapper for the DEFLATE CONVERSION CALL instruction.
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*/
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typedef enum {
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DFLTCC_CC_OK = 0,
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DFLTCC_CC_OP1_TOO_SHORT = 1,
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DFLTCC_CC_OP2_TOO_SHORT = 2,
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DFLTCC_CC_OP2_CORRUPT = 2,
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DFLTCC_CC_AGAIN = 3,
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} dfltcc_cc;
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#define DFLTCC_QAF 0
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#define DFLTCC_GDHT 1
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#define DFLTCC_CMPR 2
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#define DFLTCC_XPND 4
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#define HBT_CIRCULAR (1 << 7)
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#define HB_BITS 15
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#define HB_SIZE (1 << HB_BITS)
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static inline dfltcc_cc dfltcc(
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int fn,
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void *param,
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Byte **op1,
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size_t *len1,
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const Byte **op2,
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size_t *len2,
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void *hist
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)
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{
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Byte *t2 = op1 ? *op1 : NULL;
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size_t t3 = len1 ? *len1 : 0;
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const Byte *t4 = op2 ? *op2 : NULL;
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size_t t5 = len2 ? *len2 : 0;
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register int r0 __asm__("r0") = fn;
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register void *r1 __asm__("r1") = param;
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register Byte *r2 __asm__("r2") = t2;
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register size_t r3 __asm__("r3") = t3;
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register const Byte *r4 __asm__("r4") = t4;
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register size_t r5 __asm__("r5") = t5;
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int cc;
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__asm__ volatile(
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".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
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"ipm %[cc]\n"
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: [r2] "+r" (r2)
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, [r3] "+r" (r3)
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, [r4] "+r" (r4)
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, [r5] "+r" (r5)
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, [cc] "=r" (cc)
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: [r0] "r" (r0)
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, [r1] "r" (r1)
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, [hist] "r" (hist)
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: "cc", "memory");
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t2 = r2; t3 = r3; t4 = r4; t5 = r5;
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if (op1)
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*op1 = t2;
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if (len1)
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*len1 = t3;
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if (op2)
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*op2 = t4;
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if (len2)
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*len2 = t5;
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return (cc >> 28) & 3;
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}
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static inline int is_bit_set(
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const char *bits,
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int n
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)
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{
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return bits[n / 8] & (1 << (7 - (n % 8)));
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}
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static inline void turn_bit_off(
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char *bits,
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int n
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)
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{
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bits[n / 8] &= ~(1 << (7 - (n % 8)));
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}
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static inline int dfltcc_are_params_ok(
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int level,
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uInt window_bits,
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int strategy,
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uLong level_mask
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)
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{
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return (level_mask & (1 << level)) != 0 &&
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(window_bits == HB_BITS) &&
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(strategy == Z_DEFAULT_STRATEGY);
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}
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char *oesc_msg(char *buf, int oesc);
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#endif /* DFLTCC_UTIL_H */
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