testsuite/gdb.arch/skip-prologue.exp

# Copyright 2024 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 <http://www.gnu.org/licenses/>.

# Test-case that checks architecture-specific prologue analyzers.

standard_testfile

if { [prepare_for_testing "failed to prepare"  $testfile $srcfile \
	  {nodebug}] } {
    return -1
}

proc do_test { f } {
    set bp_addr ""
    gdb_test_multiple "break $f" "" {
	-re -wrap "Breakpoint $::decimal at ($::hex)" {
	    set bp_addr $expect_out(1,string)
	    pass $gdb_test_name
	}
    }

    if { $bp_addr == "" } {
	return
    }

    set prologue_end_addr ""
    gdb_test_multiple "p /x &${f}_prologue_end" "" {
	-re -wrap " = ($::hex)" {
	    set prologue_end_addr $expect_out(1,string)
	    pass $gdb_test_name
	}
    }

    if { $prologue_end_addr == "" } {
	return
    }

    set test {$bp_addr == $prologue_end_addr}
    if { [expr $test] } {
	pass $test
    } elseif { $bp_addr < $prologue_end_addr } {
	# We'll allow this.  For instance, amd64 has a prologue
	# analyzer that doesn't skip the 3rd instruction here, which saves an
	# argument register to stack:
	#
	#   00000000004004ae <f2>:
	#   4004ae:       55                      push   %rbp
	#   4004af:       48 89 e5                mov    %rsp,%rbp
	#   4004b2:       89 7d fc                mov    %edi,-0x4(%rbp)
	#   00000000004004b5 <f2_prologue_end>:
	#
	pass "$test (skipped less than possible)"
    } elseif { $bp_addr > $prologue_end_addr } {
	fail "$test (skipped too much)"
    } else {
	fail "$test"
    }
}

foreach f { f1 f2 f3 f4 } {
    with_test_prefix $f {
	do_test $f
    }
}