| Message ID | 20190515124006.25840-2-christophe.lyon@st.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | FDPIC ABI for ARM | expand |
[This isn't really something that should be reviewed under global reviewership, but if it's either that or nothing, I'll do it anyway...] Christophe Lyon <christophe.lyon@st.com> writes: > 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> > Mickaël Guêné <mickael.guene@st.com> > > gcc/ > * config/arm/arm.opt: Add -mfdpic option. > * doc/invoke.texi: Add documentation for -mfdpic. > > Change-Id: I0eabd1d11c9406fd4a43c4333689ebebbfcc4fe8 > > diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt > index 9067d49..2ed3bd5 100644 > --- a/gcc/config/arm/arm.opt > +++ b/gcc/config/arm/arm.opt > @@ -306,3 +306,7 @@ Cost to assume for a branch insn. > mgeneral-regs-only > Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save > Generate code which uses the core registers only (r0-r14). > + > +mfdpic > +Target Report Mask(FDPIC) > +Enable Function Descriptor PIC mode. > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > index 29585cf..805d7cc 100644 > --- a/gcc/doc/invoke.texi > +++ b/gcc/doc/invoke.texi > @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. > -mrestrict-it @gol > -mverbose-cost-dump @gol > -mpure-code @gol > --mcmse} > +-mcmse @gol > +-mfdpic} > > @emph{AVR Options} > @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol > @@ -17912,6 +17913,23 @@ MOVT instruction. > Generate secure code as per the "ARMv8-M Security Extensions: Requirements on > Development Tools Engineering Specification", which can be found on > @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. > + > +@item -mfdpic > +@itemx -mno-fdpic > +@opindex mfdpic > +@opindex mno-fdpic > +Select the FDPIC ABI, which uses function descriptors to represent Maybe "64-bit function descriptors"? Just a suggestion, might not be useful. OK with that change, thanks. Richard > +pointers to functions. When the compiler is configured for > +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default > +and implies @option{-fPIE} if none of the PIC/PIE-related options is > +provided. On other targets, it only enables the FDPIC-specific code > +generation features, and the user should explicitly provide the > +PIC/PIE-related options as needed. > + > +The opposite @option{-mno-fdpic} option is useful (and required) to > +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) > +toolchain as the one used to build the userland programs. > + > @end table > > @node AVR Options
On 16/07/2019 12:11, Richard Sandiford wrote: > [This isn't really something that should be reviewed under global > reviewership, but if it's either that or nothing, I'll do it anyway...] > > Christophe Lyon <christophe.lyon@st.com> writes: >> 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> >> Mickaël Guêné <mickael.guene@st.com> >> >> gcc/ >> * config/arm/arm.opt: Add -mfdpic option. >> * doc/invoke.texi: Add documentation for -mfdpic. >> >> Change-Id: I0eabd1d11c9406fd4a43c4333689ebebbfcc4fe8 >> >> diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt >> index 9067d49..2ed3bd5 100644 >> --- a/gcc/config/arm/arm.opt >> +++ b/gcc/config/arm/arm.opt >> @@ -306,3 +306,7 @@ Cost to assume for a branch insn. >> mgeneral-regs-only >> Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save >> Generate code which uses the core registers only (r0-r14). >> + >> +mfdpic >> +Target Report Mask(FDPIC) >> +Enable Function Descriptor PIC mode. >> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi >> index 29585cf..805d7cc 100644 >> --- a/gcc/doc/invoke.texi >> +++ b/gcc/doc/invoke.texi >> @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. >> -mrestrict-it @gol >> -mverbose-cost-dump @gol >> -mpure-code @gol >> --mcmse} >> +-mcmse @gol >> +-mfdpic} >> >> @emph{AVR Options} >> @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol >> @@ -17912,6 +17913,23 @@ MOVT instruction. >> Generate secure code as per the "ARMv8-M Security Extensions: Requirements on >> Development Tools Engineering Specification", which can be found on >> @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. >> + >> +@item -mfdpic >> +@itemx -mno-fdpic >> +@opindex mfdpic >> +@opindex mno-fdpic >> +Select the FDPIC ABI, which uses function descriptors to represent > > Maybe "64-bit function descriptors"? Just a suggestion, might not be useful. > > OK with that change, thanks. OK, here is a new version, where I added a few words to explain that -static is not supported. Thanks, Christophe > > Richard > >> +pointers to functions. When the compiler is configured for >> +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default >> +and implies @option{-fPIE} if none of the PIC/PIE-related options is >> +provided. On other targets, it only enables the FDPIC-specific code >> +generation features, and the user should explicitly provide the >> +PIC/PIE-related options as needed. >> + >> +The opposite @option{-mno-fdpic} option is useful (and required) to >> +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) >> +toolchain as the one used to build the userland programs. >> + >> @end table >> >> @node AVR Options > . > From c936684e2b77ff5716bd8b67c617dcad088c72e0 Mon Sep 17 00:00:00 2001 From: Christophe Lyon <christophe.lyon@linaro.org> Date: Thu, 8 Feb 2018 10:44:32 +0100 Subject: [ARM/FDPIC v6 01/24] [ARM] FDPIC: Add -mfdpic option support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> Mickaël Guêné <mickael.guene@st.com> gcc/ * config/arm/arm.opt: Add -mfdpic option. * doc/invoke.texi: Add documentation for -mfdpic. Change-Id: I05b98d6ae87c2b3fc04dd7fba415c730accdf33e diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt index 9067d49..2ed3bd5 100644 --- a/gcc/config/arm/arm.opt +++ b/gcc/config/arm/arm.opt @@ -306,3 +306,7 @@ Cost to assume for a branch insn. mgeneral-regs-only Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save Generate code which uses the core registers only (r0-r14). + +mfdpic +Target Report Mask(FDPIC) +Enable Function Descriptor PIC mode. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 29585cf..b77fa06 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. -mrestrict-it @gol -mverbose-cost-dump @gol -mpure-code @gol --mcmse} +-mcmse @gol +-mfdpic} @emph{AVR Options} @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol @@ -17912,6 +17913,27 @@ MOVT instruction. Generate secure code as per the "ARMv8-M Security Extensions: Requirements on Development Tools Engineering Specification", which can be found on @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. + +@item -mfdpic +@itemx -mno-fdpic +@opindex mfdpic +@opindex mno-fdpic +Select the FDPIC ABI, which uses 64-bit function descriptors to +represent pointers to functions. When the compiler is configured for +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default +and implies @option{-fPIE} if none of the PIC/PIE-related options is +provided. On other targets, it only enables the FDPIC-specific code +generation features, and the user should explicitly provide the +PIC/PIE-related options as needed. + +Note that static linking is not supported because it would still +involve the dynamic linker when the program self-relocates. If such +behaviour is acceptable, use -static and -Wl,-dynamic-linker options. + +The opposite @option{-mno-fdpic} option is useful (and required) to +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) +toolchain as the one used to build the userland programs. + @end table @node AVR Options -- 2.6.3
Christophe Lyon <christophe.lyon@st.com> writes: > On 16/07/2019 12:11, Richard Sandiford wrote: >> [This isn't really something that should be reviewed under global >> reviewership, but if it's either that or nothing, I'll do it anyway...] >> >> Christophe Lyon <christophe.lyon@st.com> writes: >>> 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> >>> Mickaël Guêné <mickael.guene@st.com> >>> >>> gcc/ >>> * config/arm/arm.opt: Add -mfdpic option. >>> * doc/invoke.texi: Add documentation for -mfdpic. >>> >>> Change-Id: I0eabd1d11c9406fd4a43c4333689ebebbfcc4fe8 >>> >>> diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt >>> index 9067d49..2ed3bd5 100644 >>> --- a/gcc/config/arm/arm.opt >>> +++ b/gcc/config/arm/arm.opt >>> @@ -306,3 +306,7 @@ Cost to assume for a branch insn. >>> mgeneral-regs-only >>> Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save >>> Generate code which uses the core registers only (r0-r14). >>> + >>> +mfdpic >>> +Target Report Mask(FDPIC) >>> +Enable Function Descriptor PIC mode. >>> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi >>> index 29585cf..805d7cc 100644 >>> --- a/gcc/doc/invoke.texi >>> +++ b/gcc/doc/invoke.texi >>> @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. >>> -mrestrict-it @gol >>> -mverbose-cost-dump @gol >>> -mpure-code @gol >>> --mcmse} >>> +-mcmse @gol >>> +-mfdpic} >>> >>> @emph{AVR Options} >>> @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol >>> @@ -17912,6 +17913,23 @@ MOVT instruction. >>> Generate secure code as per the "ARMv8-M Security Extensions: Requirements on >>> Development Tools Engineering Specification", which can be found on >>> @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. >>> + >>> +@item -mfdpic >>> +@itemx -mno-fdpic >>> +@opindex mfdpic >>> +@opindex mno-fdpic >>> +Select the FDPIC ABI, which uses function descriptors to represent >> >> Maybe "64-bit function descriptors"? Just a suggestion, might not be useful. >> >> OK with that change, thanks. > > OK, here is a new version, where I added a few words to explain that -static > is not supported. > > Thanks, > Christophe > >> >> Richard >> >>> +pointers to functions. When the compiler is configured for >>> +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default >>> +and implies @option{-fPIE} if none of the PIC/PIE-related options is >>> +provided. On other targets, it only enables the FDPIC-specific code >>> +generation features, and the user should explicitly provide the >>> +PIC/PIE-related options as needed. >>> + >>> +The opposite @option{-mno-fdpic} option is useful (and required) to >>> +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) >>> +toolchain as the one used to build the userland programs. >>> + >>> @end table >>> >>> @node AVR Options >> . >> > > From c936684e2b77ff5716bd8b67c617dcad088c72e0 Mon Sep 17 00:00:00 2001 > From: Christophe Lyon <christophe.lyon@linaro.org> > Date: Thu, 8 Feb 2018 10:44:32 +0100 > Subject: [ARM/FDPIC v6 01/24] [ARM] FDPIC: Add -mfdpic option support > MIME-Version: 1.0 > Content-Type: text/plain; charset=UTF-8 > Content-Transfer-Encoding: 8bit > > 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> > Micka«l Guªn© <mickael.guene@st.com> > > gcc/ > * config/arm/arm.opt: Add -mfdpic option. > * doc/invoke.texi: Add documentation for -mfdpic. > > Change-Id: I05b98d6ae87c2b3fc04dd7fba415c730accdf33e > > diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt > index 9067d49..2ed3bd5 100644 > --- a/gcc/config/arm/arm.opt > +++ b/gcc/config/arm/arm.opt > @@ -306,3 +306,7 @@ Cost to assume for a branch insn. > mgeneral-regs-only > Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save > Generate code which uses the core registers only (r0-r14). > + > +mfdpic > +Target Report Mask(FDPIC) > +Enable Function Descriptor PIC mode. > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > index 29585cf..b77fa06 100644 > --- a/gcc/doc/invoke.texi > +++ b/gcc/doc/invoke.texi > @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. > -mrestrict-it @gol > -mverbose-cost-dump @gol > -mpure-code @gol > --mcmse} > +-mcmse @gol > +-mfdpic} > > @emph{AVR Options} > @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol > @@ -17912,6 +17913,27 @@ MOVT instruction. > Generate secure code as per the "ARMv8-M Security Extensions: Requirements on > Development Tools Engineering Specification", which can be found on > @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. > + > +@item -mfdpic > +@itemx -mno-fdpic > +@opindex mfdpic > +@opindex mno-fdpic > +Select the FDPIC ABI, which uses 64-bit function descriptors to > +represent pointers to functions. When the compiler is configured for > +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default > +and implies @option{-fPIE} if none of the PIC/PIE-related options is > +provided. On other targets, it only enables the FDPIC-specific code > +generation features, and the user should explicitly provide the > +PIC/PIE-related options as needed. > + > +Note that static linking is not supported because it would still > +involve the dynamic linker when the program self-relocates. If such > +behaviour is acceptable, use -static and -Wl,-dynamic-linker options. "behavior". (To correct correct spelling :-/) OK with that change if there are no objections before the rest of the series is approved. > + > +The opposite @option{-mno-fdpic} option is useful (and required) to > +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) > +toolchain as the one used to build the userland programs. > + > @end table > > @node AVR Options
diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt index 9067d49..2ed3bd5 100644 --- a/gcc/config/arm/arm.opt +++ b/gcc/config/arm/arm.opt @@ -306,3 +306,7 @@ Cost to assume for a branch insn. mgeneral-regs-only Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save Generate code which uses the core registers only (r0-r14). + +mfdpic +Target Report Mask(FDPIC) +Enable Function Descriptor PIC mode. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 29585cf..805d7cc 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -703,7 +703,8 @@ Objective-C and Objective-C++ Dialects}. -mrestrict-it @gol -mverbose-cost-dump @gol -mpure-code @gol --mcmse} +-mcmse @gol +-mfdpic} @emph{AVR Options} @gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol @@ -17912,6 +17913,23 @@ MOVT instruction. Generate secure code as per the "ARMv8-M Security Extensions: Requirements on Development Tools Engineering Specification", which can be found on @url{http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/ECM0359818_armv8m_security_extensions_reqs_on_dev_tools_1_0.pdf}. + +@item -mfdpic +@itemx -mno-fdpic +@opindex mfdpic +@opindex mno-fdpic +Select the FDPIC ABI, which uses function descriptors to represent +pointers to functions. When the compiler is configured for +@code{arm-*-uclinuxfdpiceabi} targets, this option is on by default +and implies @option{-fPIE} if none of the PIC/PIE-related options is +provided. On other targets, it only enables the FDPIC-specific code +generation features, and the user should explicitly provide the +PIC/PIE-related options as needed. + +The opposite @option{-mno-fdpic} option is useful (and required) to +build the Linux kernel using the same (@code{arm-*-uclinuxfdpiceabi}) +toolchain as the one used to build the userland programs. + @end table @node AVR Options