Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 471 insertions, 0 deletions

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
new file mode 100644
index 000000000000..ee52cb8e17ad
--- /dev/null
+++ b/scripts/recordmcount.c
@@ -0,0 +1,471 @@
+/*
+ * recordmcount.c: construct a table of the locations of calls to 'mcount'
+ * so that ftrace can find them quickly.
+ * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>.  All rights reserved.
+ * Licensed under the GNU General Public License, version 2 (GPLv2).
+ *
+ * Restructured to fit Linux format, as well as other updates:
+ *  Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
+ */
+
+/*
+ * Strategy: alter the .o file in-place.
+ *
+ * Append a new STRTAB that has the new section names, followed by a new array
+ * ElfXX_Shdr[] that has the new section headers, followed by the section
+ * contents for __mcount_loc and its relocations.  The old shstrtab strings,
+ * and the old ElfXX_Shdr[] array, remain as "garbage" (commonly, a couple
+ * kilobytes.)  Subsequent processing by /bin/ld (or the kernel module loader)
+ * will ignore the garbage regions, because they are not designated by the
+ * new .e_shoff nor the new ElfXX_Shdr[].  [In order to remove the garbage,
+ * then use "ld -r" to create a new file that omits the garbage.]
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <getopt.h>
+#include <elf.h>
+#include <fcntl.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static int fd_map;      /* File descriptor for file being modified. */
+static int mmap_failed; /* Boolean flag. */
+static void *ehdr_curr; /* current ElfXX_Ehdr *  for resource cleanup */
+static char gpfx;       /* prefix for global symbol name (sometimes '_') */
+static struct stat sb;  /* Remember .st_size, etc. */
+static jmp_buf jmpenv;  /* setjmp/longjmp per-file error escape */
+static const char *altmcount;   /* alternate mcount symbol name */
+static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
+
+/* setjmp() return values */
+enum {
+        SJ_SETJMP = 0,  /* hardwired first return */
+        SJ_FAIL,
+        SJ_SUCCEED
+};
+
+/* Per-file resource cleanup when multiple files. */
+static void
+cleanup(void)
+{
+        if (!mmap_failed)
+                munmap(ehdr_curr, sb.st_size);
+        else
+                free(ehdr_curr);
+        close(fd_map);
+}
+
+static void __attribute__((noreturn))
+fail_file(void)
+{
+        cleanup();
+        longjmp(jmpenv, SJ_FAIL);
+}
+
+static void __attribute__((noreturn))
+succeed_file(void)
+{
+        cleanup();
+        longjmp(jmpenv, SJ_SUCCEED);
+}
+
+/* ulseek, uread, ...:  Check return value for errors. */
+
+static off_t
+ulseek(int const fd, off_t const offset, int const whence)
+{
+        off_t const w = lseek(fd, offset, whence);
+        if (w == (off_t)-1) {
+                perror("lseek");
+                fail_file();
+        }
+        return w;
+}
+
+static size_t
+uread(int const fd, void *const buf, size_t const count)
+{
+        size_t const n = read(fd, buf, count);
+        if (n != count) {
+                perror("read");
+                fail_file();
+        }
+        return n;
+}
+
+static size_t
+uwrite(int const fd, void const *const buf, size_t const count)
+{
+        size_t const n = write(fd, buf, count);
+        if (n != count) {
+                perror("write");
+                fail_file();
+        }
+        return n;
+}
+
+static void *
+umalloc(size_t size)
+{
+        void *const addr = malloc(size);
+        if (addr == 0) {
+                fprintf(stderr, "malloc failed: %zu bytes\n", size);
+                fail_file();
+        }
+        return addr;
+}
+
+static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
+static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 };
+static unsigned char *ideal_nop;
+
+static char rel_type_nop;
+
+static int (*make_nop)(void *map, size_t const offset);
+
+static int make_nop_x86(void *map, size_t const offset)
+{
+        uint32_t *ptr;
+        unsigned char *op;
+
+        /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */
+        ptr = map + offset;
+        if (*ptr != 0)
+                return -1;
+
+        op = map + offset - 1;
+        if (*op != 0xe8)
+                return -1;
+
+        /* convert to nop */
+        ulseek(fd_map, offset - 1, SEEK_SET);
+        uwrite(fd_map, ideal_nop, 5);
+        return 0;
+}
+
+/*
+ * Get the whole file as a programming convenience in order to avoid
+ * malloc+lseek+read+free of many pieces.  If successful, then mmap
+ * avoids copying unused pieces; else just read the whole file.
+ * Open for both read and write; new info will be appended to the file.
+ * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr
+ * do not propagate to the file until an explicit overwrite at the last.
+ * This preserves most aspects of consistency (all except .st_size)
+ * for simultaneous readers of the file while we are appending to it.
+ * However, multiple writers still are bad.  We choose not to use
+ * locking because it is expensive and the use case of kernel build
+ * makes multiple writers unlikely.
+ */
+static void *mmap_file(char const *fname)
+{
+        void *addr;
+
+        fd_map = open(fname, O_RDWR);
+        if (fd_map < 0 || fstat(fd_map, &sb) < 0) {
+                perror(fname);
+                fail_file();
+        }
+        if (!S_ISREG(sb.st_mode)) {
+                fprintf(stderr, "not a regular file: %s\n", fname);
+                fail_file();
+        }
+        addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
+                    fd_map, 0);
+        mmap_failed = 0;
+        if (addr == MAP_FAILED) {
+                mmap_failed = 1;
+                addr = umalloc(sb.st_size);
+                uread(fd_map, addr, sb.st_size);
+        }
+        return addr;
+}
+
+/* w8rev, w8nat, ...: Handle endianness. */
+
+static uint64_t w8rev(uint64_t const x)
+{
+        return   ((0xff & (x >> (0 * 8))) << (7 * 8))
+               | ((0xff & (x >> (1 * 8))) << (6 * 8))
+               | ((0xff & (x >> (2 * 8))) << (5 * 8))
+               | ((0xff & (x >> (3 * 8))) << (4 * 8))
+               | ((0xff & (x >> (4 * 8))) << (3 * 8))
+               | ((0xff & (x >> (5 * 8))) << (2 * 8))
+               | ((0xff & (x >> (6 * 8))) << (1 * 8))
+               | ((0xff & (x >> (7 * 8))) << (0 * 8));
+}
+
+static uint32_t w4rev(uint32_t const x)
+{
+        return   ((0xff & (x >> (0 * 8))) << (3 * 8))
+               | ((0xff & (x >> (1 * 8))) << (2 * 8))
+               | ((0xff & (x >> (2 * 8))) << (1 * 8))
+               | ((0xff & (x >> (3 * 8))) << (0 * 8));
+}
+
+static uint32_t w2rev(uint16_t const x)
+{
+        return   ((0xff & (x >> (0 * 8))) << (1 * 8))
+               | ((0xff & (x >> (1 * 8))) << (0 * 8));
+}
+
+static uint64_t w8nat(uint64_t const x)
+{
+        return x;
+}
+
+static uint32_t w4nat(uint32_t const x)
+{
+        return x;
+}
+
+static uint32_t w2nat(uint16_t const x)
+{
+        return x;
+}
+
+static uint64_t (*w8)(uint64_t);
+static uint32_t (*w)(uint32_t);
+static uint32_t (*w2)(uint16_t);
+
+/* Names of the sections that could contain calls to mcount. */
+static int
+is_mcounted_section_name(char const *const txtname)
+{
+        return strcmp(".text",           txtname) == 0 ||
+                strcmp(".ref.text",      txtname) == 0 ||
+                strcmp(".sched.text",    txtname) == 0 ||
+                strcmp(".spinlock.text", txtname) == 0 ||
+                strcmp(".irqentry.text", txtname) == 0 ||
+                strcmp(".kprobes.text", txtname) == 0 ||
+                strcmp(".text.unlikely", txtname) == 0;
+}
+
+/* 32 bit and 64 bit are very similar */
+#include "recordmcount.h"
+#define RECORD_MCOUNT_64
+#include "recordmcount.h"
+
+/* 64-bit EM_MIPS has weird ELF64_Rela.r_info.
+ * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
+ * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40]
+ * to imply the order of the members; the spec does not say so.
+ *      typedef unsigned char Elf64_Byte;
+ * fails on MIPS64 because their <elf.h> already has it!
+ */
+
+typedef uint8_t myElf64_Byte;           /* Type for a 8-bit quantity.  */
+
+union mips_r_info {
+        Elf64_Xword r_info;
+        struct {
+                Elf64_Word r_sym;               /* Symbol index.  */
+                myElf64_Byte r_ssym;            /* Special symbol.  */
+                myElf64_Byte r_type3;           /* Third relocation.  */
+                myElf64_Byte r_type2;           /* Second relocation.  */
+                myElf64_Byte r_type;            /* First relocation.  */
+        } r_mips;
+};
+
+static uint64_t MIPS64_r_sym(Elf64_Rel const *rp)
+{
+        return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym);
+}
+
+static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type)
+{
+        rp->r_info = ((union mips_r_info){
+                .r_mips = { .r_sym = w(sym), .r_type = type }
+        }).r_info;
+}
+
+static void
+do_file(char const *const fname)
+{
+        Elf32_Ehdr *const ehdr = mmap_file(fname);
+        unsigned int reltype = 0;
+
+        ehdr_curr = ehdr;
+        w = w4nat;
+        w2 = w2nat;
+        w8 = w8nat;
+        switch (ehdr->e_ident[EI_DATA]) {
+                static unsigned int const endian = 1;
+        default:
+                fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
+                        ehdr->e_ident[EI_DATA], fname);
+                fail_file();
+                break;
+        case ELFDATA2LSB:
+                if (*(unsigned char const *)&endian != 1) {
+                        /* main() is big endian, file.o is little endian. */
+                        w = w4rev;
+                        w2 = w2rev;
+                        w8 = w8rev;
+                }
+                break;
+        case ELFDATA2MSB:
+                if (*(unsigned char const *)&endian != 0) {
+                        /* main() is little endian, file.o is big endian. */
+                        w = w4rev;
+                        w2 = w2rev;
+                        w8 = w8rev;
+                }
+                break;
+        }  /* end switch */
+        if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0
+        ||  w2(ehdr->e_type) != ET_REL
+        ||  ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
+                fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
+                fail_file();
+        }
+
+        gpfx = 0;
+        switch (w2(ehdr->e_machine)) {
+        default:
+                fprintf(stderr, "unrecognized e_machine %d %s\n",
+                        w2(ehdr->e_machine), fname);
+                fail_file();
+                break;
+        case EM_386:
+                reltype = R_386_32;
+                make_nop = make_nop_x86;
+                ideal_nop = ideal_nop5_x86_32;
+                mcount_adjust_32 = -1;
+                break;
+        case EM_ARM:     reltype = R_ARM_ABS32;
+                         altmcount = "__gnu_mcount_nc";
+                         break;
+        case EM_IA_64:   reltype = R_IA64_IMM64;   gpfx = '_'; break;
+        case EM_MIPS:    /* reltype: e_class    */ gpfx = '_'; break;
+        case EM_PPC:     reltype = R_PPC_ADDR32;   gpfx = '_'; break;
+        case EM_PPC64:   reltype = R_PPC64_ADDR64; gpfx = '_'; break;
+        case EM_S390:    /* reltype: e_class    */ gpfx = '_'; break;
+        case EM_SH:      reltype = R_SH_DIR32;                 break;
+        case EM_SPARCV9: reltype = R_SPARC_64;     gpfx = '_'; break;
+        case EM_X86_64:
+                make_nop = make_nop_x86;
+                ideal_nop = ideal_nop5_x86_64;
+                reltype = R_X86_64_64;
+                mcount_adjust_64 = -1;
+                break;
+        }  /* end switch */
+
+        switch (ehdr->e_ident[EI_CLASS]) {
+        default:
+                fprintf(stderr, "unrecognized ELF class %d %s\n",
+                        ehdr->e_ident[EI_CLASS], fname);
+                fail_file();
+                break;
+        case ELFCLASS32:
+                if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
+                ||  w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
+                        fprintf(stderr,
+                                "unrecognized ET_REL file: %s\n", fname);
+                        fail_file();
+                }
+                if (w2(ehdr->e_machine) == EM_S390) {
+                        reltype = R_390_32;
+                        mcount_adjust_32 = -4;
+                }
+                if (w2(ehdr->e_machine) == EM_MIPS) {
+                        reltype = R_MIPS_32;
+                        is_fake_mcount32 = MIPS32_is_fake_mcount;
+                }
+                do32(ehdr, fname, reltype);
+                break;
+        case ELFCLASS64: {
+                Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
+                if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
+                ||  w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
+                        fprintf(stderr,
+                                "unrecognized ET_REL file: %s\n", fname);
+                        fail_file();
+                }
+                if (w2(ghdr->e_machine) == EM_S390) {
+                        reltype = R_390_64;
+                        mcount_adjust_64 = -8;
+                }
+                if (w2(ghdr->e_machine) == EM_MIPS) {
+                        reltype = R_MIPS_64;
+                        Elf64_r_sym = MIPS64_r_sym;
+                        Elf64_r_info = MIPS64_r_info;
+                        is_fake_mcount64 = MIPS64_is_fake_mcount;
+                }
+                do64(ghdr, fname, reltype);
+                break;
+        }
+        }  /* end switch */
+
+        cleanup();
+}
+
+int
+main(int argc, char *argv[])
+{
+        const char ftrace[] = "/ftrace.o";
+        int ftrace_size = sizeof(ftrace) - 1;
+        int n_error = 0;  /* gcc-4.3.0 false positive complaint */
+        int c;
+        int i;
+
+        while ((c = getopt(argc, argv, "w")) >= 0) {
+                switch (c) {
+                case 'w':
+                        warn_on_notrace_sect = 1;
+                        break;
+                default:
+                        fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
+                        return 0;
+                }
+        }
+
+        if ((argc - optind) < 1) {
+                fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
+                return 0;
+        }
+
+        /* Process each file in turn, allowing deep failure. */
+        for (i = optind; i < argc; i++) {
+                char *file = argv[i];
+                int const sjval = setjmp(jmpenv);
+                int len;
+
+                /*
+                 * The file kernel/trace/ftrace.o references the mcount
+                 * function but does not call it. Since ftrace.o should
+                 * not be traced anyway, we just skip it.
+                 */
+                len = strlen(file);
+                if (len >= ftrace_size &&
+                    strcmp(file + (len - ftrace_size), ftrace) == 0)
+                        continue;
+
+                switch (sjval) {
+                default:
+                        fprintf(stderr, "internal error: %s\n", file);
+                        exit(1);
+                        break;
+                case SJ_SETJMP:    /* normal sequence */
+                        /* Avoid problems if early cleanup() */
+                        fd_map = -1;
+                        ehdr_curr = NULL;
+                        mmap_failed = 1;
+                        do_file(file);
+                        break;
+                case SJ_FAIL:    /* error in do_file or below */
+                        ++n_error;
+                        break;
+                case SJ_SUCCEED:    /* premature success */
+                        /* do nothing */
+                        break;
+                }  /* end switch */
+        }
+        return !!n_error;
+}
+
+