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Add support for generating ARM unwind tables.
This commit is contained in:
Nick Clifton
parent
1763908f7c
commit
7ed4c4c5d0
@ -1,3 +1,24 @@
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2004-10-05 Paul Brook <paul@codesourcery.com>
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* config/tc-arm.c (unwind): New variable.
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(vfp_sp_encode_reg): New function.
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(vfp_sp_reg_required_here): Use it.
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(vfp_sp_reg_list, vfp_dp_reg_list): Remove.
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(vfp_parse_reg_list): New function.
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(s_arm_unwind_fnstart, s_arm_unwind_fnend, s_arm_unwind_cantunwind,
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s_arm_unwind_personality, s_arm_unwind_personalityindex,
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s_arm_unwind_handlerdata, s_arm_unwind_save, s_arm_unwind_movsp,
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s_arm_unwind_pad, s_arm_unwind_setfp, s_arm_unwind_raw): New
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functions.
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(md_pseudo_table): Add them.
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(do_vfp_reg2_from_sp2): Use vfp_parse_reg_list and vfp_sp_encode_reg.
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(do_vfp_sp2_from_reg2, vfp_sp_ldstm, vfp_dp_ldstm): Ditto.
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(set_section, add_unwind_adjustsp, flush_pending_unwind,
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finish_unwind_opcodes, start_unwind_section, create_unwind_entry,
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require_hashconst, add_unwind_opcode): New functions.
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* doc/tc-arm.text: Document unwinding opcodes.
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* NEWS: Mention the new feature.
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2004-10-04 Eric Christopher <echristo@redhat.com>
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* config/tc-mips.c (md_apply_fix3): Remove erroneous assert.
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2
gas/NEWS
2
gas/NEWS
@ -1,5 +1,7 @@
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-*- text -*-
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* Added support for generating unwind tables for ARM ELF targets.
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* Add a -g command line option to generate debug information in the target's
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preferred debug format.
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1429
gas/config/tc-arm.c
1429
gas/config/tc-arm.c
File diff suppressed because it is too large
Load Diff
@ -407,6 +407,104 @@ it prevents accurate control of the placement of literal pools.
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@item .pool
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This is a synonym for .ltorg.
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@cindex @code{.fnstart} directive, ARM
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@item .unwind_fnstart
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Marks the start of a function with an unwind table entry.
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@cindex @code{.fnend} directive, ARM
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@item .unwind_fnend
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Marks the end of a function with an unwind table entry. The unwind index
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table entry is created when this directive is processed.
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If no personality routine has been specified then standard personality
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routine 0 or 1 will be used, depending on the number of unwind opcodes
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required.
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@cindex @code{.cantunwind} directive, ARM
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@item .cantunwind
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Prevents unwinding through the current function. No personality routine
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or exception table data is required or permitted.
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@cindex @code{.personality} directive, ARM
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@item .personality @var{name}
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Sets the personality routine for the current function to @var{name}.
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@cindex @code{.personalityindex} directive, ARM
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@item .personalityindex @var{index}
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Sets the personality routine for the current function to the EABI standard
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routine number @var{index}
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@cindex @code{.handlerdata} directive, ARM
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@item .handlerdata
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Marks the end of the current function, and the start of the exception table
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entry for that function. Anything between this directive and the
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@code{.fnend} directive will be added to the exception table entry.
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Must be preceded by a @code{.personality} or @code{.personalityindex}
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directive.
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@cindex @code{.save} directive, ARM
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@item .save @var{reglist}
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Generate unwinder annotations to restore the registers in @var{reglist}.
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The format of @var{reglist} is the same as the corresponding store-multiple
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instruction.
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@smallexample
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@exdent @emph{core registers}
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.save @{r4, r5, r6, lr@}
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stmfd sp!, @{r4, r5, r6, lr@}
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@exdent @emph{FPA registers}
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.save f4, 2
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sfmfd f4, 2, [sp]!
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@exdent @emph{VFP registers}
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.save @{d8, d9, d10@}
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fstmdf sp!, @{d8, d9, d10@}
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@exdent @emph{iWMMXt registers}
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.save @{wr10, wr11@}
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wstrd wr11, [sp, #-8]!
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wstrd wr10, [sp, #-8]!
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or
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.save wr11
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wstrd wr11, [sp, #-8]!
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.save wr10
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wstrd wr10, [sp, #-8]!
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@end smallexample
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@cindex @code{.pad} directive, ARM
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@item .pad #@var{count}
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Generate unwinder annotations for a stack adjustment of @var{count} bytes.
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A positive value indicates the function prologue allocated stack space by
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decrementing the stack pointer.
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@cindex @code{.movsp} directive, ARM
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@item .movsp @var{reg}
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Tell the unwinder that @var{reg} contains the current stack pointer.
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@cindex @code{.setfp} directive, ARM
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@item .setfp @var{fpreg}, @var{spreg} [, #@var{offset}]
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Make all unwinder annotations relaive to a frame pointer. Without this
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the unwinder will use offsets from the stack pointer.
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The syntax of this directive is the same as the @code{sub} or @code{mov}
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instruction used to set the frame pointer. @var{spreg} must be either
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@code{sp} or mentioned in a previous @code{.movsp} directive.
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@smallexample
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.movsp ip
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mov ip, sp
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@dots{}
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.setfp fp, ip, #4
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sub fp, ip, #4
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@end smallexample
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@cindex @code{.unwind_raw} directive, ARM
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@item .raw @var{offset}, @var{byte1}, @dots{}
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Insert one of more arbitary unwind opcode bytes, which are known to adjust
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the stack pointer by @var{offset} bytes.
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For example @code{.unwind_raw 4, 0xb1, 0x01} is equivalent to
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@code{.save @{r0@}}
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@end table
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@node ARM Opcodes
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@ -58,10 +58,11 @@ if {[istarget *arm*-*-*] || [istarget "xscale-*-*"]} then {
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run_errors_test "r15-bad" "" "Invalid use of r15 errors"
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run_errors_test "undefined" "" "Undefined local label error"
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if {[istarget *-*-elf*] || [istarget *-*-linux*]} then {
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if {[istarget *-*-*elf*] || [istarget *-*-linux*] || [istarget *-*-*eabi]} then {
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run_dump_test "pic"
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run_dump_test "mapping"
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gas_test "bignum1.s" "" $stdoptlist "bignums"
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run_dump_test "unwind"
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}
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if {! [istarget arm*-*-aout] && ![istarget arm-*-pe]} then {
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33
gas/testsuite/gas/arm/unwind.d
Normal file
33
gas/testsuite/gas/arm/unwind.d
Normal file
@ -0,0 +1,33 @@
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#objdump: -sr
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#name: Unwind table generation
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.*: file format.*
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RELOCATION RECORDS FOR \[.ARM.extab\]:
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OFFSET TYPE VALUE
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0000000c R_ARM_PREL31 .text
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RELOCATION RECORDS FOR \[.ARM.exidx\]:
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OFFSET TYPE VALUE
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00000000 R_ARM_REL32 .text
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00000008 R_ARM_REL32 .text
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0000000c R_ARM_PREL31 .ARM.extab
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00000010 R_ARM_REL32 .text
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00000014 R_ARM_PREL31 .ARM.extab
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00000018 R_ARM_REL32 .text
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0000001c R_ARM_PREL31 .ARM.extab
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00000020 R_ARM_REL32 .text
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Contents of section .text:
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0000 (0000a0e3 0100a0e3 0200a0e3 0300a0e3|e3a00000 a0e30001 e3a00002 e3a00003) .*
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0010 (0420|2004) .*
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Contents of section .ARM.extab:
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0000 (449b0181 b0b08086|81019b44 8680b0b0) 00000000 00000000 .*
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0010 (8402b101 b0b0b005 2a000000 00c60181|01b10284 05b0b0b0 000000a2 8101c600) .*
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0020 (b0b0c1c1|c1c1b0b0) 00000000 .*
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Contents of section .ARM.exidx:
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0000 00000000 (b0b0a880 04000000|80a8b0b0 00000004) 00000000 .*
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0010 (08000000 0c000000 0c000000 1c000000|00000008 0000000c 0000000c 0000001c) .*
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0020 (10000000 08849780|00000010 80978480) .*
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46
gas/testsuite/gas/arm/unwind.s
Normal file
46
gas/testsuite/gas/arm/unwind.s
Normal file
@ -0,0 +1,46 @@
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# Test generation of unwind tables
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.text
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foo: @ Simple function
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.fnstart
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.save {r4, lr}
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mov r0, #0
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.fnend
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foo1: @ Typical frame pointer prologue
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.fnstart
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.movsp ip
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@mov ip, sp
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.pad #4
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.save {fp, ip, lr}
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@stmfd sp!, {fp, ip, lr, pc}
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.setfp fp, ip, #4
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@sub fp, ip, #4
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mov r0, #1
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.fnend
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foo2: @ Custom personality routine
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.fnstart
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.save {r1, r4, r6, lr}
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@stmfd {r1, r4, r6, lr}
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mov r0, #2
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.personality foo
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.handlerdata
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.word 42
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.fnend
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foo3: @ Saving iwmmxt registers
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.fnstart
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.save {wr11}
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.save {wr10}
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.save {wr10, wr11}
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.save {wr0}
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mov r0, #3
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.fnend
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.code 16
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foo4: @ Thumb frame pointer
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.fnstart
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.save {r7, lr}
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@push {r7, lr}
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.setfp r7, sp
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@mov r7, sp
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.pad #8
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@sub sp, sp, #8
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mov r0, #4
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.fnend
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