Add the scaffolding for minidumps. They're just like physical dumps,
except the chunks aren't physical memory regions but virtual memory regions. In both cases, the core file is an ELF file and flags in the header allow libkvm to distinguish one from the other.
This commit is contained in:
marcel
parent
df1e5281df
commit
3dce685f43
@ -56,7 +56,10 @@ CTASSERT(sizeof(struct kerneldumpheader) == 512);
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#define MD_ALIGN(x) (((off_t)(x) + EFI_PAGE_MASK) & ~EFI_PAGE_MASK)
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#define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
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typedef int callback_t(struct efi_md*, int, void*);
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static int minidump = 0;
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TUNABLE_INT("debug.minidump", &minidump);
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SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &minidump, 0,
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"Enable mini crash dumps");
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static struct kerneldumpheader kdh;
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static off_t dumplo, fileofs;
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@ -83,7 +86,7 @@ buf_write(struct dumperinfo *di, char *ptr, size_t sz)
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error = dump_write(di, buffer, 0, dumplo,
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DEV_BSIZE);
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if (error)
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return error;
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return (error);
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dumplo += DEV_BSIZE;
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fragsz = 0;
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}
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@ -106,8 +109,14 @@ buf_flush(struct dumperinfo *di)
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return (error);
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}
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/*
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* Physical dump support
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*/
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typedef int phys_callback_t(struct efi_md*, int, void*);
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static int
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cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg)
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phys_cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg)
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{
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struct dumperinfo *di = (struct dumperinfo*)arg;
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vm_offset_t pa;
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@ -153,7 +162,7 @@ cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg)
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}
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static int
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cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg)
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phys_cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg)
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{
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struct dumperinfo *di = (struct dumperinfo*)arg;
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Elf64_Phdr phdr;
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@ -175,7 +184,7 @@ cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg)
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}
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static int
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cb_size(struct efi_md *mdp, int seqnr, void *arg)
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phys_cb_size(struct efi_md *mdp, int seqnr, void *arg)
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{
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uint64_t *sz = (uint64_t*)arg;
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@ -184,7 +193,7 @@ cb_size(struct efi_md *mdp, int seqnr, void *arg)
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}
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static int
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foreach_chunk(callback_t cb, void *arg)
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phys_foreach(phys_callback_t cb, void *arg)
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{
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struct efi_md *mdp;
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int error, seqnr;
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@ -206,6 +215,31 @@ foreach_chunk(callback_t cb, void *arg)
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return (seqnr);
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}
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/*
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* Virtual dump (aka minidump) support
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*/
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static int
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virt_size(uint64_t *dumpsize)
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{
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return (0);
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}
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static int
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virt_dumphdrs(struct dumperinfo *di)
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{
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return (-ENOSYS);
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}
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static int
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virt_dumpdata(struct dumperinfo *di)
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{
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return (-ENOSYS);
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}
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void
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dumpsys(struct dumperinfo *di)
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{
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@ -213,7 +247,7 @@ dumpsys(struct dumperinfo *di)
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uint64_t dumpsize;
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off_t hdrgap;
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size_t hdrsz;
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int error;
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int error, status;
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bzero(&ehdr, sizeof(ehdr));
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ehdr.e_ident[EI_MAG0] = ELFMAG0;
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@ -230,18 +264,25 @@ dumpsys(struct dumperinfo *di)
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ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
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ehdr.e_type = ET_CORE;
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ehdr.e_machine = EM_IA_64;
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ehdr.e_entry = ia64_tpa((uintptr_t)bootinfo);
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ehdr.e_entry = (minidump) ? (uintptr_t)bootinfo :
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ia64_tpa((uintptr_t)bootinfo);
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ehdr.e_phoff = sizeof(ehdr);
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ehdr.e_flags = EF_IA_64_ABSOLUTE; /* XXX misuse? */
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ehdr.e_flags = (minidump) ? 0 : EF_IA_64_ABSOLUTE; /* XXX misuse? */
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ehdr.e_ehsize = sizeof(ehdr);
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ehdr.e_phentsize = sizeof(Elf64_Phdr);
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ehdr.e_shentsize = sizeof(Elf64_Shdr);
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/* Calculate dump size. */
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dumpsize = 0L;
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ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
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status = (minidump) ? virt_size(&dumpsize) :
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phys_foreach(phys_cb_size, &dumpsize);
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if (status < 0) {
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error = -status;
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goto fail;
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}
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ehdr.e_phnum = status;
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hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
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fileofs = MD_ALIGN(hdrsz);
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fileofs = (minidump) ? round_page(hdrsz) : MD_ALIGN(hdrsz);
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dumpsize += fileofs;
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hdrgap = fileofs - DEV_ALIGN(hdrsz);
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@ -270,24 +311,30 @@ dumpsys(struct dumperinfo *di)
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goto fail;
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/* Dump program headers */
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error = foreach_chunk(cb_dumphdr, di);
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if (error < 0)
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status = (minidump) ? virt_dumphdrs(di) :
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phys_foreach(phys_cb_dumphdr, di);
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if (status < 0) {
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error = -status;
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goto fail;
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}
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buf_flush(di);
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/*
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* All headers are written using blocked I/O, so we know the
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* current offset is (still) block aligned. Skip the alignement
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* current offset is (still) block aligned. Skip the alignment
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* in the file to have the segment contents aligned at page
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* boundary. We cannot use MD_ALIGN on dumplo, because we don't
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* care and may very well be unaligned within the dump device.
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* boundary. For physical dumps, it's the EFI page size (= 4K).
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* For minidumps it's the kernel's page size (= 8K).
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*/
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dumplo += hdrgap;
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/* Dump memory chunks (updates dumplo) */
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error = foreach_chunk(cb_dumpdata, di);
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if (error < 0)
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status = (minidump) ? virt_dumpdata(di) :
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phys_foreach(phys_cb_dumpdata, di);
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if (status < 0) {
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error = -status;
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goto fail;
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}
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/* Dump trailer */
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error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
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@ -300,9 +347,6 @@ dumpsys(struct dumperinfo *di)
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return;
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fail:
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if (error < 0)
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error = -error;
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if (error == ECANCELED)
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printf("\nDump aborted\n");
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else
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