2007-05-17 H.J. Lu <hongjiu.lu@intel.com>
PR gas/4517 2003-06-05 Michal Ludvig <mludvig@suse.cz> * as.texinfo: Document new directives: .cfi_restore, .cfi_undefined, .cfi_same_value, .cfi_return_column, .cfi_remember_state and .cfi_restore_state. 2007-05-17 H.J. Lu <hongjiu.lu@intel.com> 2003-06-05 Michal Ludvig <mludvig@suse.cz> * testsuite/gas/cfi/cfi-x86_64.s: Test new directives and different writings of registers and numbers. * testsuite/gas/cfi/cfi-x86_64.d: Updated pattern to match the above change.
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H.J. Lu
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@ -1,3 +1,19 @@
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2007-05-17 H.J. Lu <hongjiu.lu@intel.com>
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PR gas/4517
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2003-06-05 Michal Ludvig <mludvig@suse.cz>
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* as.texinfo: Document new directives: .cfi_restore,
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.cfi_undefined, .cfi_same_value, .cfi_return_column,
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.cfi_remember_state and .cfi_restore_state.
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2007-05-17 H.J. Lu <hongjiu.lu@intel.com>
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2003-06-05 Michal Ludvig <mludvig@suse.cz>
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* testsuite/gas/cfi/cfi-x86_64.s: Test new directives
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and different writings of registers and numbers.
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* testsuite/gas/cfi/cfi-x86_64.d: Updated pattern to
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match the above change.
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2007-05-17 Nathan Sidwell <nathan@codesourcery.com>
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* config/tc-m68k.c (md_apply_fix): Show value of out of range
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@ -3790,7 +3790,7 @@ Some machine configurations provide additional directives.
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* Byte:: @code{.byte @var{expressions}}
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* Comm:: @code{.comm @var{symbol} , @var{length} }
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* CFI directives:: @code{.cfi_startproc}, @code{.cfi_endproc}, etc.
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* CFI directives:: @code{.cfi_startproc [simple]}, @code{.cfi_endproc}, etc.
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* Data:: @code{.data @var{subsection}}
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@ifset COFF
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@ -4109,14 +4109,16 @@ The syntax for @code{.comm} differs slightly on the HPPA. The syntax is
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@end ifset
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@node CFI directives
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@section @code{.cfi_startproc}
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@section @code{.cfi_startproc [simple]}
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@cindex @code{cfi_startproc} directive
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@code{.cfi_startproc} is used at the beginning of each function that
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should have an entry in @code{.eh_frame}. It initializes some internal
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data structures and emits architecture dependent initial CFI instructions.
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Don't forget to close the function by
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data structures. Don't forget to close the function by
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@code{.cfi_endproc}.
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Unless @code{.cfi_startproc} is used along with parameter @code{simple}
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it also emits some architecture dependent initial CFI instructions.
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@section @code{.cfi_endproc}
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@cindex @code{cfi_endproc} directive
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@code{.cfi_endproc} is used at the end of a function where it closes its
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@ -4172,6 +4174,31 @@ using the known displacement of the CFA register from the CFA.
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This is often easier to use, because the number will match the
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code it's annotating.
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@section @code{.cfi_register @var{register1}, @var{register2}}
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Previous value of @var{register1} is saved in register @var{register2}.
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@section @code{.cfi_restore @var{register}}
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@code{.cfi_restore} says that the rule for @var{register} is now the
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same as it was at the beginning of the function, after all initial
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instruction added by @code{.cfi_startproc} were executed.
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@section @code{.cfi_undefined @var{register}}
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From now on the previous value of @var{register} can't be restored anymore.
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@section @code{.cfi_same_value @var{register}}
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Current value of @var{register} is the same like in the previous frame,
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i.e. no restoration needed.
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@section @code{.cfi_remember_state},
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First save all current rules for all registers by @code{.cfi_remember_state},
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then totally screw them up by subsequent @code{.cfi_*} directives and when
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everything is hopelessly bad, use @code{.cfi_restore_state} to restore
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the previous saved state.
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@section @code{.cfi_return_column @var{register}}
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Change return column @var{register}, i.e. the return address is either
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directly in @var{register} or can be accessed by rules for @var{register}.
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@section @code{.cfi_signal_frame}
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Mark current function as signal trampoline.
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@ -35,7 +35,7 @@ The section .eh_frame contains:
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00000050 00000014 00000054 FDE cie=00000000 pc=00000022..00000035
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DW_CFA_advance_loc: 3 to 00000025
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DW_CFA_def_cfa_reg: r12
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DW_CFA_def_cfa_reg: r8
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DW_CFA_advance_loc: 15 to 00000034
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DW_CFA_def_cfa_reg: r7
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DW_CFA_nop
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@ -50,3 +50,40 @@ The section .eh_frame contains:
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DW_CFA_nop
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DW_CFA_nop
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00000090 00000010 00000000 CIE
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Version: 1
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Augmentation: "zR"
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Code alignment factor: 1
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Data alignment factor: -8
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Return address column: 16
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Augmentation data: 1b
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DW_CFA_def_cfa: r7 ofs 8
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000000a4 00000030 00000018 FDE cie=00000090 pc=0000004d..00000058
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DW_CFA_advance_loc: 1 to 0000004e
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DW_CFA_def_cfa_offset: 16
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DW_CFA_advance_loc: 1 to 0000004f
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DW_CFA_def_cfa_reg: r8
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DW_CFA_advance_loc: 1 to 00000050
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DW_CFA_def_cfa_offset: 4676
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DW_CFA_advance_loc: 1 to 00000051
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DW_CFA_offset_extended_sf: r4 at cfa\+16
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DW_CFA_advance_loc: 1 to 00000052
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DW_CFA_register: r8 in r9
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DW_CFA_advance_loc: 1 to 00000053
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DW_CFA_remember_state
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DW_CFA_advance_loc: 1 to 00000054
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DW_CFA_restore: r6
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DW_CFA_advance_loc: 1 to 00000055
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DW_CFA_undefined: r16
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DW_CFA_advance_loc: 1 to 00000056
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DW_CFA_same_value: r3
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DW_CFA_advance_loc: 1 to 00000057
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DW_CFA_restore_state
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DW_CFA_nop
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DW_CFA_nop
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DW_CFA_nop
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DW_CFA_nop
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DW_CFA_nop
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@ -35,9 +35,9 @@ func_prologue:
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#; each instruction.
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset rbp,-16
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.cfi_offset %rbp, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register rbp
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.cfi_def_cfa_register %rbp
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#; function body
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call func_locvars
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@ -46,7 +46,7 @@ func_prologue:
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#; epilogue with valid CFI
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#; (we're better than gcc :-)
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leaveq
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.cfi_def_cfa rsp,8
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.cfi_def_cfa %rsp, 8
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ret
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.cfi_endproc
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@ -59,21 +59,21 @@ func_prologue:
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func_otherreg:
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.cfi_startproc
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#; save frame pointer to r12
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movq %rsp,%r12
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.cfi_def_cfa_register r12
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#; save frame pointer to r8
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movq %rsp,%r8
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.cfi_def_cfa_register r8
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#; alocate space for local vars
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#; (no .cfi_{def,adjust}_cfa_offset here,
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#; because CFA is computed from r12!)
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#; because CFA is computed from r8!)
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sub $100,%rsp
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#; function body
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call func_prologue
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addl $2, %eax
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#; restore frame pointer from r12
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movq %r12,%rsp
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#; restore frame pointer from r8
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movq %r8,%rsp
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.cfi_def_cfa_register rsp
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ret
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.cfi_endproc
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@ -105,3 +105,34 @@ _start:
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syscall
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hlt
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.cfi_endproc
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#; func_alldirectives
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#; - test for all .cfi directives.
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#; This function is never called and the CFI info doesn't make sense.
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.type func_alldirectives,@function
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func_alldirectives:
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.cfi_startproc simple
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.cfi_def_cfa rsp,8
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nop
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.cfi_def_cfa_offset 16
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nop
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.cfi_def_cfa_register r8
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nop
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.cfi_adjust_cfa_offset 0x1234
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nop
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.cfi_offset %rsi, 0x10
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nop
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.cfi_register %r8, %r9
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nop
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.cfi_remember_state
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nop
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.cfi_restore %rbp
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nop
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.cfi_undefined %rip
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nop
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.cfi_same_value rbx
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nop
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.cfi_restore_state
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ret
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.cfi_endproc
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