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# Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010

# Free Software Foundation, Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see .

#

# Tests for shared object file relocation. If two shared objects have

# the same load address (actually, overlapping load spaces), one of

# them gets relocated at load-time. Check that gdb gets the right

# values for the debugging and minimal symbols.

if {[skip_shlib_tests]} {

    return 0

}

if $tracelevel then {

    strace $tracelevel

}

#

# This file uses shreloc.c, shreloc1.c and shreloc2.c

#

set prms_id 0

set bug_id 0

set workdir ${objdir}/${subdir}

set testfile "shreloc"

set libfile1 "shreloc1"

set libfile2 "shreloc2"

set srcfile $srcdir/$subdir/$testfile.c

set lib1src $srcdir/$subdir/$libfile1.c

set lib2src $srcdir/$subdir/$libfile2.c

set binfile $objdir/$subdir/$testfile

set lib1_sl $objdir/$subdir/$libfile1.sl

set lib2_sl $objdir/$subdir/$libfile2.sl

if [get_compiler_info ${binfile}] {

    return -1

}

set lib_opts "debug"

set exec_opts [list debug shlib=$lib1_sl shlib=$lib2_sl]

if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {

    lappend lib_opts "ldflags=-Wl,--image-base,0x04000000"

}

if [test_compiler_info "xlc-*"] {

    # IBM's xlc compiler does not add static variables to the ELF symbol

    # table by default.  We need this option to make the variables show

    # up in "maint print msymbols".

    lappend lib_opts "additional_flags=-qstatsym"

}

if { [gdb_compile_shlib $lib1src $lib1_sl $lib_opts] != ""} {

    untested "Could not build $lib1_sl."

    return -1

} elseif { [gdb_compile_shlib $lib2src $lib2_sl $lib_opts] != ""} {

    untested "Could not build $lib1_s2."

    return -1

} elseif { [gdb_compile $srcfile $binfile executable $exec_opts] != ""} {

    untested "Could not build $binfile."

    return -1

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${workdir}/shreloc

gdb_load_shlibs $lib1_sl $lib2_sl

# Load up the shared objects

if ![runto_main] then {

    fail "Can't run to main"

    return 0

}

proc get_var_address { var } {

  global gdb_prompt hex

  send_gdb "print &${var}\n"

  # Match output like:

  # $1 = (int *) 0x0

  # $5 = (int (*)()) 0

  # $6 = (int (*)()) 0x24 

  gdb_expect {

    -re "\\\$\[0-9\]+ = \\(.*\\) (0|$hex)( <${var}>)?\[\r\n\]+${gdb_prompt} $"

        {

          pass "get address of ${var}"

          if { $expect_out(1,string) == "0" } {

            return "0x0"

          } else {

            return $expect_out(1,string)

          }

        }

    -re "${gdb_prompt} $"

        { fail "get address of ${var} (unknown output)" }

    timeout

        { fail "get address of ${var} (timeout)" }

  }

  return ""

}

#

# Check debugging symbol relocations

#

# Check extern function for relocation

set fn_1_addr [get_var_address fn_1]

set fn_2_addr [get_var_address fn_2]

if { "${fn_1_addr}" == "${fn_2_addr}" } {

  fail "relocated extern functions have different addresses"

} else {

  pass "relocated extern functions have different addresses"

}

# Check extern var for relocation

set extern_var_1_addr [get_var_address extern_var_1]

set extern_var_2_addr [get_var_address extern_var_2]

if { "${extern_var_1_addr}" == "${extern_var_2_addr}" } {

  fail "relocated extern variables have different addresses"

} else {

  pass "relocated extern variables have different addresses"

}

# Check static var for relocation

set static_var_1_addr [get_var_address static_var_1]

set static_var_2_addr [get_var_address static_var_2]

if { "${static_var_1_addr}" == "${static_var_2_addr}" } {

  fail "relocated static variables have different addresses"

} else {

  pass "relocated static variables have different addresses"

}

#

# Check minimal symbol relocations

#

proc send_gdb_discard { command } {

    # Send a command to gdb and discard output up to the next prompt

    global gdb_prompt

    send_gdb "${command}\n"

    # Discard output

    gdb_expect {

        -re ".*\[\r\n]+${gdb_prompt} $" {

            return 1

        }

        timeout {

            fail "{$command} (timeout)"

            return 0

        }

    }

}

proc get_msym_addrs { var msymfile } {

    # Extract the list of values for symbols matching var in the

    # minimal symbol output file

    global gdb_prompt hex

    set result ""

    send_gdb "shell grep -E \" ${var}(\[ \t\]+.*)?\$\" ${msymfile}\n"

    while 1 {

        gdb_expect {

            -re "\[\[\]\[ 0-9\]+\] . (${hex}) ${var}(\[ \t\]+\[^\r\n\]*)?\[\r\n\]+" {

                set result [concat $result $expect_out(1,string)]

            }

            -re "$gdb_prompt $" {

                pass "get_msym_addrs ${var}"

                return "${result}"

            }

            -re "\[^\r\n\]*\[\r\n\]+" {

                # Skip

            }

            timeout {

                fail "get_msym_addrs ${var} (timeout)"

                return -1

            }

        }

    }

}

proc check_same {var msymfile} {

    # Check that the minimal symbol values matching var are the same

    set len [llength [lsort -unique [get_msym_addrs "${var}" "${msymfile}"]]]

    if { $len == 1 } {

        return 1

    } else {

        return 0

    }

}

proc check_different {var msymfile} {

    # Check that the minimal symbol values matching var are different

    set addr_list [lsort [get_msym_addrs "${var}" "${msymfile}"]]

    set prev ""

    if { [llength ${addr_list}] < 2 } {

        return 0

    }

    foreach addr ${addr_list} {

        if { ${prev} == ${addr} } {

          return 0

        }

        set prev ${addr}

    }

    return 1

}

set msymfile "${workdir}/shreloc.txt"

if [send_gdb_discard "maint print msymbols ${msymfile}"] {

    if {[check_different "static_var_\[12\]" "${msymfile}"]} {

        pass "(msymbol) relocated static vars have different addresses"

    } else {

        fail "(msymbol) relocated static vars have different addresses"

    }

    if {[check_different "extern_var_\[12\]" "${msymfile}"]} {

        pass "(msymbol) relocated extern vars have different addresses"

    } else {

        fail "(msymbol) relocated extern vars have different addresses"

    }

    if {[check_different "fn_\[12\]" "${msymfile}"]} {

        pass "(msymbol) relocated functions have different addresses"

    } else {

        fail "(msymbol) relocated functions have different addresses"

    }

}

if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {

    #

    # We know the names of some absolute symbols included in the

    # portable-executable (DLL) format. Check that they didn't get

    # relocated.

    #

    # A better approach would be include absolute symbols via the assembler.

    #

    if {[check_same "_minor_os_version__" "${msymfile}"]} {

        pass "Absolute symbols not relocated"

    } else {

        fail "Absolute symbols not relocated"

    }

}