diff options
author | marcel <marcel@FreeBSD.org> | 2014-07-02 23:05:57 +0000 |
---|---|---|
committer | marcel <marcel@FreeBSD.org> | 2014-07-02 23:05:57 +0000 |
commit | ee8a73303bef55593e41438b51ca8a50974ab4b9 (patch) | |
tree | 7b1ec38f581109297bbf88543a0eb7b21b8149fc /sys/ia64 | |
parent | a4a765f93dc4150bfb9097cfd3813c125a6e0d68 (diff) | |
download | FreeBSD-src-ee8a73303bef55593e41438b51ca8a50974ab4b9.zip FreeBSD-src-ee8a73303bef55593e41438b51ca8a50974ab4b9.tar.gz |
MFC r259959 & r260009: Add prototypical support for minidumps.
Diffstat (limited to 'sys/ia64')
-rw-r--r-- | sys/ia64/ia64/dump_machdep.c | 172 |
1 files changed, 151 insertions, 21 deletions
diff --git a/sys/ia64/ia64/dump_machdep.c b/sys/ia64/ia64/dump_machdep.c index 6fa8608..6a07491 100644 --- a/sys/ia64/ia64/dump_machdep.c +++ b/sys/ia64/ia64/dump_machdep.c @@ -56,7 +56,10 @@ CTASSERT(sizeof(struct kerneldumpheader) == 512); #define MD_ALIGN(x) (((off_t)(x) + EFI_PAGE_MASK) & ~EFI_PAGE_MASK) #define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1)) -typedef int callback_t(struct efi_md*, int, void*); +static int minidump = 0; +TUNABLE_INT("debug.minidump", &minidump); +SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &minidump, 0, + "Enable mini crash dumps"); static struct kerneldumpheader kdh; static off_t dumplo, fileofs; @@ -83,7 +86,7 @@ buf_write(struct dumperinfo *di, char *ptr, size_t sz) error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE); if (error) - return error; + return (error); dumplo += DEV_BSIZE; fragsz = 0; } @@ -106,8 +109,14 @@ buf_flush(struct dumperinfo *di) return (error); } +/* + * Physical dump support + */ + +typedef int phys_callback_t(struct efi_md*, int, void*); + static int -cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg) +phys_cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg) { struct dumperinfo *di = (struct dumperinfo*)arg; vm_offset_t pa; @@ -153,7 +162,7 @@ cb_dumpdata(struct efi_md *mdp, int seqnr, void *arg) } static int -cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg) +phys_cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg) { struct dumperinfo *di = (struct dumperinfo*)arg; Elf64_Phdr phdr; @@ -175,7 +184,7 @@ cb_dumphdr(struct efi_md *mdp, int seqnr, void *arg) } static int -cb_size(struct efi_md *mdp, int seqnr, void *arg) +phys_cb_size(struct efi_md *mdp, int seqnr, void *arg) { uint64_t *sz = (uint64_t*)arg; @@ -184,7 +193,7 @@ cb_size(struct efi_md *mdp, int seqnr, void *arg) } static int -foreach_chunk(callback_t cb, void *arg) +phys_foreach(phys_callback_t cb, void *arg) { struct efi_md *mdp; int error, seqnr; @@ -206,6 +215,117 @@ foreach_chunk(callback_t cb, void *arg) return (seqnr); } +/* + * Virtual dump (aka minidump) support + */ + +typedef int virt_callback_t(vm_offset_t, vm_size_t, int, void*); + +static int +virt_cb_size(vm_offset_t va, vm_size_t sz, int seqnr, void *arg) +{ + uint64_t *dumpsize = (uint64_t *)arg; + + *dumpsize += sz; + return (0); +} + +static int +virt_cb_dumphdr(vm_offset_t va, vm_size_t sz, int seqnr, void *arg) +{ + struct dumperinfo *di = (struct dumperinfo *)arg; + Elf64_Phdr phdr; + int error; + + bzero(&phdr, sizeof(phdr)); + phdr.p_type = PT_LOAD; + phdr.p_flags = PF_R; /* XXX */ + phdr.p_offset = fileofs; + phdr.p_vaddr = va; + phdr.p_paddr = ~0UL; + phdr.p_filesz = sz; + phdr.p_memsz = sz; + phdr.p_align = PAGE_SIZE; + + error = buf_write(di, (char*)&phdr, sizeof(phdr)); + fileofs += phdr.p_filesz; + return (error); +} + +static int +virt_cb_dumpdata(vm_offset_t va, vm_size_t sz, int seqnr, void *arg) +{ + struct dumperinfo *di = (struct dumperinfo *)arg; + size_t counter, iosz; + int c, error, twiddle; + + error = 0; /* catch case in which pgs is 0 */ + counter = 0; /* Update twiddle every 16MB */ + twiddle = 0; + + printf(" chunk %d: %ld pages ", seqnr, atop(sz)); + + while (sz) { + iosz = (sz > DFLTPHYS) ? DFLTPHYS : sz; + counter += iosz; + if (counter >> 24) { + printf("%c\b", "|/-\\"[twiddle++ & 3]); + counter &= (1<<24) - 1; + } +#ifdef SW_WATCHDOG + wdog_kern_pat(WD_LASTVAL); +#endif + error = dump_write(di, (void*)va, 0, dumplo, iosz); + if (error) + break; + dumplo += iosz; + sz -= iosz; + va += iosz; + + /* Check for user abort. */ + c = cncheckc(); + if (c == 0x03) + return (ECANCELED); + if (c != -1) + printf("(CTRL-C to abort) "); + } + printf("... %s\n", (error) ? "fail" : "ok"); + return (error); +} + +static int +virt_foreach(virt_callback_t cb, void *arg) +{ + vm_offset_t va; + vm_size_t sz; + int error, seqnr; + + seqnr = 0; + while (1) { + switch (seqnr) { + case 0: + va = IA64_PBVM_BASE; + sz = round_page(bootinfo->bi_kernend) - va; + break; + default: + va = 0; + sz = 0; + break; + } + if (va == 0 && sz == 0) + break; + error = (*cb)(va, sz, seqnr, arg); + if (error) + return (-error); + seqnr++; + } + return (seqnr); +} + +/* + * main entry point. + */ + void dumpsys(struct dumperinfo *di) { @@ -213,7 +333,7 @@ dumpsys(struct dumperinfo *di) uint64_t dumpsize; off_t hdrgap; size_t hdrsz; - int error; + int error, status; bzero(&ehdr, sizeof(ehdr)); ehdr.e_ident[EI_MAG0] = ELFMAG0; @@ -230,18 +350,25 @@ dumpsys(struct dumperinfo *di) ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */ ehdr.e_type = ET_CORE; ehdr.e_machine = EM_IA_64; - ehdr.e_entry = ia64_tpa((uintptr_t)bootinfo); + ehdr.e_entry = (minidump) ? (uintptr_t)bootinfo : + ia64_tpa((uintptr_t)bootinfo); ehdr.e_phoff = sizeof(ehdr); - ehdr.e_flags = EF_IA_64_ABSOLUTE; /* XXX misuse? */ + ehdr.e_flags = (minidump) ? 0 : EF_IA_64_ABSOLUTE; /* XXX misuse? */ ehdr.e_ehsize = sizeof(ehdr); ehdr.e_phentsize = sizeof(Elf64_Phdr); ehdr.e_shentsize = sizeof(Elf64_Shdr); /* Calculate dump size. */ dumpsize = 0L; - ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize); + status = (minidump) ? virt_foreach(virt_cb_size, &dumpsize) : + phys_foreach(phys_cb_size, &dumpsize); + if (status < 0) { + error = -status; + goto fail; + } + ehdr.e_phnum = status; hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize; - fileofs = MD_ALIGN(hdrsz); + fileofs = (minidump) ? round_page(hdrsz) : MD_ALIGN(hdrsz); dumpsize += fileofs; hdrgap = fileofs - DEV_ALIGN(hdrsz); @@ -270,24 +397,30 @@ dumpsys(struct dumperinfo *di) goto fail; /* Dump program headers */ - error = foreach_chunk(cb_dumphdr, di); - if (error < 0) + status = (minidump) ? virt_foreach(virt_cb_dumphdr, di) : + phys_foreach(phys_cb_dumphdr, di); + if (status < 0) { + error = -status; goto fail; + } buf_flush(di); /* * All headers are written using blocked I/O, so we know the - * current offset is (still) block aligned. Skip the alignement + * current offset is (still) block aligned. Skip the alignment * in the file to have the segment contents aligned at page - * boundary. We cannot use MD_ALIGN on dumplo, because we don't - * care and may very well be unaligned within the dump device. + * boundary. For physical dumps, it's the EFI page size (= 4K). + * For minidumps it's the kernel's page size (= 8K). */ dumplo += hdrgap; /* Dump memory chunks (updates dumplo) */ - error = foreach_chunk(cb_dumpdata, di); - if (error < 0) + status = (minidump) ? virt_foreach(virt_cb_dumpdata, di) : + phys_foreach(phys_cb_dumpdata, di); + if (status < 0) { + error = -status; goto fail; + } /* Dump trailer */ error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh)); @@ -300,9 +433,6 @@ dumpsys(struct dumperinfo *di) return; fail: - if (error < 0) - error = -error; - if (error == ECANCELED) printf("\nDump aborted\n"); else |