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zdump: Drop support of obsolete dumps and dumpers

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Drop support of obsolete dump and dump-tool versions (single-volume DASD,
FBA and Tape) in order to simplify zgetdump logic:
- CCW dumpers written in assembler instructions as well as stage2 dumpers
  of size less than 0x3000 (STAGE2_DUMPER_SIZE_V1 or STAGE2_DUMPER_SIZE_V2)
  haven't been used for years. Remove its traces completely as a cleanup.
  Keep the last version (version 5) of non-extended DASD dumper as well as
  newer extended DASD dumpers.
- Rename STAGE2_DUMPER_SIZE_V3 and STAGE2_DUMPER_SIZE_ZLIB constants.
- Drop support of non-extended s390 dumps of version < 5. Dump files
  of s390 format version 5 can be still produced by zgetdump (dfo_s390).
- Drop excessive dump version checking in df_s390_cpu_info_add() and
  df_s390_hdr_add() considering that obsolete s390 dumps of version lower
  than 5 no longer supported.
- Use cpu_cnt field in s390 dump header instead of the s390 dump version to
  indicate no cpu info available (DFI_CPU_CONTENT_NONE) for dfo_s390.
- Make df_s390_dumper_read() return error code upon unknown dumper
  version/magic detection.

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>
This commit is contained in:
Mikhail Zaslonko
2024-10-09 18:13:27 +02:00
committed by Jan Höppner
parent 9efd1df31d
commit 2c5d4073a7
9 changed files with 77 additions and 109 deletions
Download Patch File Download Diff File Expand all files Collapse all files
zdump/df_s390.c
+32 -28
View File
@@ -44,11 +44,12 @@ int df_s390_cpu_info_add(struct df_s390_hdr *hdr, u64 addr_max)
unsigned int i;
int rc;
if (hdr->version < 5 && hdr->magic == DF_S390_MAGIC) {
if (hdr->cpu_cnt == 0) {
/* No Prefix registers in header */
hdr->cpu_cnt = 0;
dfi_cpu_info_init(DFI_CPU_CONTENT_NONE);
} else if (check_addr_max(hdr, addr_max) != 0) {
return 0;
}
if (check_addr_max(hdr, addr_max) != 0) {
/* Only lowcore pointers available */
dfi_cpu_info_init(DFI_CPU_CONTENT_LC);
} else {
@@ -93,14 +94,11 @@ void df_s390_hdr_add(struct df_s390_hdr *hdr)
dfi_arch_set(df_s390_to_dfi_arch(hdr->arch));
if (hdr->cpu_id)
dfi_attr_cpu_id_set(hdr->cpu_id);
if ((hdr->version >= 2 || hdr->magic == DF_S390_MAGIC_EXT) &&
hdr->build_arch)
if (hdr->build_arch)
dfi_attr_build_arch_set(df_s390_to_dfi_arch(hdr->build_arch));
if ((hdr->version >= 3 || hdr->magic == DF_S390_MAGIC_EXT) &&
hdr->mem_size_real)
if (hdr->mem_size_real)
dfi_attr_mem_size_real_set(hdr->mem_size_real);
if ((hdr->version >= 5 || hdr->magic == DF_S390_MAGIC_EXT) &&
hdr->real_cpu_cnt)
if (hdr->real_cpu_cnt)
dfi_attr_real_cpu_cnt_set(hdr->real_cpu_cnt);
if (!hdr->mvdump && hdr->zlib_version_s390 && hdr->zlib_entry_size)
dfi_attr_zlib_info_set(hdr->zlib_version_s390, hdr->zlib_entry_size);
@@ -134,50 +132,56 @@ int df_s390_em_verify(struct df_s390_em *em, struct df_s390_hdr *hdr)
/*
* Read s390 dump tool from DASD with given block size
*/
void df_s390_dumper_read(struct zg_fh *fh, int blk_size,
struct df_s390_dumper *dumper)
int df_s390_dumper_read(struct zg_fh *fh, int blk_size,
struct df_s390_dumper *dumper)
{
int bytes_to_read, offset = DF_S390_MAGIC_BLK_ECKD * blk_size;
/*
* First read 3 fields at the start of the dumper. The magic number,
* version and one extra field for the old dumper case (no magic
* number, checking for specific assembler instructions).
* First read 2 fields at the start of the dumper. The magic number
* and the version.
*/
bytes_to_read = offsetof(struct df_s390_dumper, force);
bytes_to_read = offsetof(struct df_s390_dumper, size);
zg_seek(fh, offset, ZG_CHECK);
zg_read(fh, dumper, bytes_to_read, ZG_CHECK);
if (memcmp(dumper->magic, OLD_DUMPER_HEX_INSTR1, 4) == 0 &&
memcmp(&dumper->size, OLD_DUMPER_HEX_INSTR2, 2) == 0)
/* We found basr r13,0 (old dumper) */
dumper->version = 0;
dumper->size = 0;
switch (dumper->version) {
/*
* Versions 1 and 2 refer to the newer extended DASD dumpers
* while version 5 refers to the old (non-extended) DASD dump-tools
* we still support (either single-volume or multi-volume).
* Magic numbers for SV and MV dumpers apply as well.
* Pick a dumper size based on the Version and Magic combination.
*/
case 1:
if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_EXT,
DF_S390_DUMPER_MAGIC_SIZE) == 0 ||
strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_MV_EXT,
DF_S390_DUMPER_MAGIC_SIZE) == 0)
dumper->size = STAGE2_DUMPER_SIZE_V3;
else
dumper->size = STAGE2_DUMPER_SIZE_V1;
dumper->size = STAGE2_DUMPER_SIZE_SV;
break;
case 2:
if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_EXT,
DF_S390_DUMPER_MAGIC_SIZE) == 0)
dumper->size = STAGE2_DUMPER_SIZE_ZLIB;
dumper->size = STAGE2_DUMPER_SIZE_SV_ZLIB;
else if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_MV_EXT,
DF_S390_DUMPER_MAGIC_SIZE) == 0)
dumper->size = STAGE2_DUMPER_SIZE_MV;
else
dumper->size = STAGE2_DUMPER_SIZE_V2;
break;
case 3:
default:
dumper->size = STAGE2_DUMPER_SIZE_V3;
case 5:
if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC64,
DF_S390_DUMPER_MAGIC_SIZE) == 0 ||
strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_MV,
DF_S390_DUMPER_MAGIC_SIZE) == 0)
dumper->size = STAGE2_DUMPER_SIZE_SV;
break;
}
if (dumper->size == 0)
return -1;
/* Read force and mem fields in the end of the dumper */
bytes_to_read = sizeof(dumper->force) + sizeof(dumper->mem);
offset += dumper->size - bytes_to_read;
zg_seek(fh, offset, ZG_CHECK);
zg_read(fh, &dumper->force, bytes_to_read, ZG_CHECK);
return 0;
}