From 3ce2ebcf888ef86974be57f7c0ea973538317d11 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 6 Jul 2022 09:21:40 +0200 Subject: [PATCH] x86: permit "default" with .arch So far there was no way to reset the architecture to that assembly would start with in the absence of any overrides (command line or directives). Note that for Intel MCU "default" is merely an alias of "iamcu". While there also zap a stray @item from the doc section, as noticed when inspecting the generated output (which still has some quirks, but those aren't easy to address without re-flowing almost the entire section). --- gas/config/tc-i386.c | 56 ++++++++++++++++++++++++++---- gas/doc/c-i386.texi | 3 +- gas/testsuite/gas/i386/arch-dflt.l | 19 ++++++++++ gas/testsuite/gas/i386/arch-dflt.s | 14 ++++++++ gas/testsuite/gas/i386/i386.exp | 1 + 5 files changed, 85 insertions(+), 8 deletions(-) create mode 100644 gas/testsuite/gas/i386/arch-dflt.l create mode 100644 gas/testsuite/gas/i386/arch-dflt.s diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 4829ff8aaad..a52ac8b77cc 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -938,8 +938,8 @@ const relax_typeS md_relax_table[] = static const arch_entry cpu_arch[] = { - /* Do not replace the first two entries - i386_target_format() - relies on them being there in this order. */ + /* Do not replace the first two entries - i386_target_format() and + set_cpu_arch() rely on them being there in this order. */ ARCH (generic32, GENERIC32, GENERIC32, false), ARCH (generic64, GENERIC64, GENERIC64, false), ARCH (i8086, UNKNOWN, NONE, false), @@ -2724,12 +2724,47 @@ set_cpu_arch (int dummy ATTRIBUTE_UNUSED) if (!is_end_of_line[(unsigned char) *input_line_pointer]) { - char *string; - int e = get_symbol_name (&string); - unsigned int j; + char *s; + int e = get_symbol_name (&s); + const char *string = s; + unsigned int j = 0; i386_cpu_flags flags; - for (j = 0; j < ARRAY_SIZE (cpu_arch); j++) + if (strcmp (string, "default") == 0) + { + if (strcmp (default_arch, "iamcu") == 0) + string = default_arch; + else + { + static const i386_cpu_flags cpu_unknown_flags = CPU_UNKNOWN_FLAGS; + + cpu_arch_name = NULL; + free (cpu_sub_arch_name); + cpu_sub_arch_name = NULL; + cpu_arch_flags = cpu_unknown_flags; + if (flag_code == CODE_64BIT) + { + cpu_arch_flags.bitfield.cpu64 = 1; + cpu_arch_flags.bitfield.cpuno64 = 0; + } + else + { + cpu_arch_flags.bitfield.cpu64 = 0; + cpu_arch_flags.bitfield.cpuno64 = 1; + } + cpu_arch_isa = PROCESSOR_UNKNOWN; + cpu_arch_isa_flags = cpu_arch[flag_code == CODE_64BIT].flags; + if (!cpu_arch_tune_set) + { + cpu_arch_tune = cpu_arch_isa; + cpu_arch_tune_flags = cpu_arch_isa_flags; + } + + j = ARRAY_SIZE (cpu_arch) + 1; + } + } + + for (; j < ARRAY_SIZE (cpu_arch); j++) { if (strcmp (string, cpu_arch[j].name) == 0) { @@ -2802,7 +2837,7 @@ set_cpu_arch (int dummy ATTRIBUTE_UNUSED) j = ARRAY_SIZE (cpu_arch); } - if (j >= ARRAY_SIZE (cpu_arch)) + if (j == ARRAY_SIZE (cpu_arch)) as_bad (_("no such architecture: `%s'"), string); *input_line_pointer = e; @@ -13676,6 +13711,13 @@ show_arch (FILE *stream, int ext, int check) p = start; left = size - (start - message); + + if (!ext && check) + { + p = output_message (stream, p, message, start, &left, + STRING_COMMA_LEN ("default")); + } + for (j = 0; j < ARRAY_SIZE (cpu_arch); j++) { /* Should it be skipped? */ diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index 5262af2023b..95fd8ec9dc9 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -1504,6 +1504,7 @@ directive enables a warning when gas detects an instruction that is not supported on the CPU specified. The choices for @var{cpu_type} are: @multitable @columnfractions .20 .20 .20 .20 +@item @samp{default} @item @samp{i8086} @tab @samp{i186} @tab @samp{i286} @tab @samp{i386} @item @samp{i486} @tab @samp{i586} @tab @samp{i686} @tab @samp{pentium} @item @samp{pentiumpro} @tab @samp{pentiumii} @tab @samp{pentiumiii} @tab @samp{pentium4} @@ -1531,7 +1532,7 @@ supported on the CPU specified. The choices for @var{cpu_type} are: @item @samp{.avx512_vpopcntdq} @tab @samp{.avx512_vbmi2} @tab @samp{.avx512_vnni} @item @samp{.avx512_bitalg} @tab @samp{.avx512_bf16} @tab @samp{.avx512_vp2intersect} @item @samp{.tdx} @tab @samp{.avx_vnni} @tab @samp{.avx512_fp16} -@item @samp{.clwb} @tab @samp{.rdpid} @tab @samp{.ptwrite} @tab @item @samp{.ibt} +@item @samp{.clwb} @tab @samp{.rdpid} @tab @samp{.ptwrite} @tab @samp{.ibt} @item @samp{.wbnoinvd} @tab @samp{.pconfig} @tab @samp{.waitpkg} @tab @samp{.cldemote} @item @samp{.shstk} @tab @samp{.gfni} @tab @samp{.vaes} @tab @samp{.vpclmulqdq} @item @samp{.movdiri} @tab @samp{.movdir64b} @tab @samp{.enqcmd} @tab @samp{.tsxldtrk} diff --git a/gas/testsuite/gas/i386/arch-dflt.l b/gas/testsuite/gas/i386/arch-dflt.l new file mode 100644 index 00000000000..d0953b1f86d --- /dev/null +++ b/gas/testsuite/gas/i386/arch-dflt.l @@ -0,0 +1,19 @@ +.*: Assembler messages: +.*:3: Error:.*`cmovl'.* +.*:9: Error:.*`cmovg'.* +GAS LISTING .* + + +[ ]*[0-9]*[ ]+\.text +[ ]*[0-9]*[ ]+start: +[ ]*[0-9]*[ ]+cmovl %eax, %ecx +[ ]*[0-9]*[ ]* +[ ]*[0-9]*[ ]+\.arch default +[ ]*[0-9]*[ ]+\?\?\?\? 0F4DC8[ ]+cmovnl %eax, %ecx +[ ]*[0-9]*[ ]* +[ ]*[0-9]*[ ]+\.arch generic32 +[ ]*[0-9]*[ ]+cmovg %eax, %ecx +[ ]*[0-9]*[ ]* +[ ]*[0-9]*[ ]+\.arch default +[ ]*[0-9]*[ ]+\?\?\?\? 0F4EC8[ ]+cmovng %eax, %ecx +#pass diff --git a/gas/testsuite/gas/i386/arch-dflt.s b/gas/testsuite/gas/i386/arch-dflt.s new file mode 100644 index 00000000000..718bf6f4d51 --- /dev/null +++ b/gas/testsuite/gas/i386/arch-dflt.s @@ -0,0 +1,14 @@ + .text +start: + cmovl %eax, %ecx + + .arch default + cmovnl %eax, %ecx + + .arch generic32 + cmovg %eax, %ecx + + .arch default + cmovng %eax, %ecx + + .end diff --git a/gas/testsuite/gas/i386/i386.exp b/gas/testsuite/gas/i386/i386.exp index ebb1b492462..de4eb1cfba5 100644 --- a/gas/testsuite/gas/i386/i386.exp +++ b/gas/testsuite/gas/i386/i386.exp @@ -205,6 +205,7 @@ if [gas_32_check] then { run_dump_test "arch-12" run_dump_test "arch-13" run_dump_test "arch-14" + run_list_test "arch-dflt" "-march=generic32 -al" run_dump_test "8087" run_dump_test "287" run_dump_test "387" -- 2.30.2