From: Alan Modra Date: Sat, 4 May 2019 06:33:47 +0000 (+0930) Subject: m32c padding with nops X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=27cdfa03b5be812683c18e64009a5da042190ae6;p=binutils-gdb.git m32c padding with nops m32c_md_end attempted to pad out a code section with nops, but this was just plain wrong in many ways: - The padding didn't happen at all if the last section emitted wasn't a code section. - The padding went to the wrong place if subsections were used, and the last subseg used wasn't the highest numbered subseg. - Padding wasn't added to all code sections. - If the last section was empty, it was padded to 4 bytes. - The padding didn't go to a 4-byte alignment boundary, instead it effectively made the last instruction 4 bytes in size. - The padding didn't take into account that code sections may have contents other than machine instructions. So, rip it out and handle nop padding properly, also fixing .align .balign/.p2align in the middle of code. gas/ * config/tc-m32c.c (insn_size): Delete static var. (md_begin): Don't set it. (m32c_md_end): Delete. (md_assemble): Add insn_size auto var. * config/tc-m32c.h (md_end): Don't define. (m32c_md_end): Delete. (NOP_OPCODE, HANDLE_ALIGN, MAX_MEM_FOR_RS_ALIGN_CODE): Define. * testsuite/gas/all/align.d: Remove m32c from notarget list. * testsuite/gas/all/incbin.d: Likewise. * testsuite/gas/elf/dwarf2-11.d: Likewise. * testsuite/gas/macros/semi.d: Likewise. * testsuite/gas/all/gas.exp (do_comment): Similarly. ld/ * testsuite/ld-scripts/fill.d: Don't xfail m32c * testsuite/ld-scripts/fill16.d: Likewise. --- diff --git a/gas/ChangeLog b/gas/ChangeLog index 8a82fdecbe6..8ba1cde35e8 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,18 @@ +2019-05-04 Alan Modra + + * config/tc-m32c.c (insn_size): Delete static var. + (md_begin): Don't set it. + (m32c_md_end): Delete. + (md_assemble): Add insn_size auto var. + * config/tc-m32c.h (md_end): Don't define. + (m32c_md_end): Delete. + (NOP_OPCODE, HANDLE_ALIGN, MAX_MEM_FOR_RS_ALIGN_CODE): Define. + * testsuite/gas/all/align.d: Remove m32c from notarget list. + * testsuite/gas/all/incbin.d: Likewise. + * testsuite/gas/elf/dwarf2-11.d: Likewise. + * testsuite/gas/macros/semi.d: Likewise. + * testsuite/gas/all/gas.exp (do_comment): Similarly. + 2019-05-02 H.J. Lu PR gas/24485 diff --git a/gas/config/tc-m32c.c b/gas/config/tc-m32c.c index d6531869668..07501df27a5 100644 --- a/gas/config/tc-m32c.c +++ b/gas/config/tc-m32c.c @@ -86,7 +86,6 @@ size_t md_longopts_size = sizeof (md_longopts); static unsigned long m32c_mach = bfd_mach_m16c; static int cpu_mach = (1 << MACH_M16C); -static int insn_size; static int m32c_relax = 0; /* Flags to set in the elf header */ @@ -185,22 +184,6 @@ md_begin (void) /* Set the machine type */ bfd_default_set_arch_mach (stdoutput, bfd_arch_m32c, m32c_mach); - - insn_size = 0; -} - -void -m32c_md_end (void) -{ - int i, n_nops; - - if (bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) - { - /* Pad with nops for objdump. */ - n_nops = (32 - ((insn_size) % 32)) / 8; - for (i = 1; i <= n_nops; i++) - md_assemble ((char *) "nop"); - } } void @@ -335,6 +318,7 @@ md_assemble (char * str) char * errmsg; finished_insnS results; int rl_type; + int insn_size; if (m32c_mach == bfd_mach_m32c && m32c_indirect_operand (str)) return; diff --git a/gas/config/tc-m32c.h b/gas/config/tc-m32c.h index a30b828b78b..b55dd612190 100644 --- a/gas/config/tc-m32c.h +++ b/gas/config/tc-m32c.h @@ -29,9 +29,6 @@ #define TARGET_BYTES_BIG_ENDIAN 0 -#define md_end m32c_md_end -extern void m32c_md_end (void); - #define md_start_line_hook m32c_start_line_hook extern void m32c_start_line_hook (void); @@ -85,3 +82,7 @@ extern long md_pcrel_from_section (struct fix *, segT); extern int m32c_is_colon_insn (char *, char *); #define H_TICK_HEX 1 + +#define NOP_OPCODE (bfd_get_mach (stdoutput) == bfd_mach_m32c ? 0xde : 0x04) +#define HANDLE_ALIGN(fragP) +#define MAX_MEM_FOR_RS_ALIGN_CODE 1 diff --git a/gas/testsuite/gas/all/align.d b/gas/testsuite/gas/all/align.d index 9fcd6c04668..c701f25bfcc 100644 --- a/gas/testsuite/gas/all/align.d +++ b/gas/testsuite/gas/all/align.d @@ -4,7 +4,7 @@ # even if the user requested that they filled with zeros. # RISC-V handles alignment via relaxation and therefor won't have object files # with the expected alignment. -#notarget: m32c-* riscv*-* rx-* +#notarget: riscv*-* rx-* # Test the alignment pseudo-op. diff --git a/gas/testsuite/gas/all/gas.exp b/gas/testsuite/gas/all/gas.exp index a91f8c29d2a..abae8b15a6e 100644 --- a/gas/testsuite/gas/all/gas.exp +++ b/gas/testsuite/gas/all/gas.exp @@ -194,13 +194,7 @@ proc do_comment {} { if [all_ones $x1 $x2 $x3] then { pass $testname } else { fail $testname } } -# m32c pads out sections, even empty ones. -case $target_triplet in { - { m32c-*-* } { } - default { - do_comment - } -} +do_comment # This test checks the output of the -ag switch. It must detect at least # the name of the input file, output file, and options passed. diff --git a/gas/testsuite/gas/all/incbin.d b/gas/testsuite/gas/all/incbin.d index e0c7c44ae36..62f6ae78103 100644 --- a/gas/testsuite/gas/all/incbin.d +++ b/gas/testsuite/gas/all/incbin.d @@ -1,7 +1,6 @@ #as: -I$srcdir/$subdir #objdump: -s -j .text #name: incbin -#notarget: m32c-* # Test the incbin pseudo-op diff --git a/gas/testsuite/gas/elf/dwarf2-11.d b/gas/testsuite/gas/elf/dwarf2-11.d index 2a5ec84d4d5..cdaa4f10b6b 100644 --- a/gas/testsuite/gas/elf/dwarf2-11.d +++ b/gas/testsuite/gas/elf/dwarf2-11.d @@ -4,7 +4,7 @@ # The am33 avr cr16 crx ft32 mn10 msp430 nds32 pru rl78 and xtensa targets do not evaluate the subtraction of symbols at assembly time. # The riscv targets do not support the subtraction of symbols. # The tile targets require 8-byte instructions, but the test only simulates 4-byte instructions. -#notarget: am3*-* avr-* cr16-* crx-* ft32*-* m32c-* mn10*-* msp430-* nds32*-* pru-* riscv*-* rl78-* tile*-* xtensa-* +#notarget: am3*-* avr-* cr16-* crx-* ft32*-* mn10*-* msp430-* nds32*-* pru-* riscv*-* rl78-* tile*-* xtensa-* Contents of the \.debug_line section: diff --git a/gas/testsuite/gas/macros/semi.d b/gas/testsuite/gas/macros/semi.d index 66c452adab9..102d732ad6e 100644 --- a/gas/testsuite/gas/macros/semi.d +++ b/gas/testsuite/gas/macros/semi.d @@ -1,6 +1,5 @@ #objdump: -s -j .text #name: semi -#notarget: m32c-* .*: .* diff --git a/ld/ChangeLog b/ld/ChangeLog index 722e65669cc..d62a2c4d5f0 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,8 @@ +2019-05-04 Alan Modra + + * testsuite/ld-scripts/fill.d: Don't xfail m32c + * testsuite/ld-scripts/fill16.d: Likewise. + 2019-05-04 Alan Modra PR 24511 diff --git a/ld/testsuite/ld-scripts/fill.d b/ld/testsuite/ld-scripts/fill.d index 4a263497a8b..54715c58d8e 100644 --- a/ld/testsuite/ld-scripts/fill.d +++ b/ld/testsuite/ld-scripts/fill.d @@ -6,7 +6,7 @@ #skip: ia64-*-* mips*-*-freebsd* mips*-*-gnu* mips*-*-irix* mips*-*-kfreebsd* #skip: mips*-*-linux* mips*-*-netbsd* mips*-*-openbsd* mips*-*-sysv4* #skip: tilegx*-*-* tilepro-*-* x86_64-*-cygwin x86_64-*-mingw* x86_64-*-pe* -#xfail: alpha*-*-*ecoff m32c-*-* sh-*-pe sparc*-*-coff +#xfail: alpha*-*-*ecoff sh-*-pe sparc*-*-coff #xfail: tic30-*-coff tic4x-*-* tic54x-*-* z8k-*-* # # See also fill16.d. We use `skip' for configurations unsupported @@ -16,7 +16,6 @@ # # alpha-linuxecoff pads out code to 16 bytes. # ia64 aligns code to minimum 16 bytes. -# m32c pads out code sections with 4 NOPs (see `m32c_md_end'). # mips aligns to minimum 16 bytes (except for bare-metal ELF and VxWorks). # sh-pe pads out code sections to 16 bytes # sparc-coff aligns to 8 bytes diff --git a/ld/testsuite/ld-scripts/fill16.d b/ld/testsuite/ld-scripts/fill16.d index 693b80c5f1c..2f3e0fd26db 100644 --- a/ld/testsuite/ld-scripts/fill16.d +++ b/ld/testsuite/ld-scripts/fill16.d @@ -4,7 +4,7 @@ #ld: -T fill.t #objdump: -s -j .text #skip: arm-*-coff i[3-7]86-*-coff -#xfail: alpha*-*-*ecoff m32c-*-* sh-*-pe sparc*-*-coff +#xfail: alpha*-*-*ecoff sh-*-pe sparc*-*-coff #xfail: tic30-*-coff tic4x-*-* tic54x-*-* z8k-*-* # # See also fill.d. We use `skip' for configurations unsupported @@ -15,7 +15,6 @@ # alpha-linuxecoff pads out code to 16 bytes. # arm-coff always aligns code to 4 bytes. # i386-coff always aligns code to 4 bytes. -# m32c pads out code sections with 4 NOPs (see `m32c_md_end'). # sh-pe pads out code sections to 16 bytes # sparc-coff aligns to 8 bytes # tic30-coff aligns to 2 bytes