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authorJoerg Roedel <jroedel@suse.de>2020-09-07 16:15:08 +0300
committerBorislav Petkov <bp@suse.de>2020-09-07 20:45:24 +0300
commit05a2ae7c033ee30f25fbed3ceed549a5cac398a9 (patch)
tree1d38f9698cff4c21fd2f24c91894be94df97b510 /arch/x86/tools
parent05a2fdf3230306daee1def019b8f52cd06bd2e48 (diff)
downloadlinux-05a2ae7c033ee30f25fbed3ceed549a5cac398a9.tar.xz
x86/insn: Make inat-tables.c suitable for pre-decompression code
The inat-tables.c file has some arrays in it that contain pointers to other arrays. These pointers need to be relocated when the kernel image is moved to a different location. The pre-decompression boot-code has no support for applying ELF relocations, so initialize these arrays at runtime in the pre-decompression code to make sure all pointers are correctly initialized. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lkml.kernel.org/r/20200907131613.12703-8-joro@8bytes.org
Diffstat (limited to 'arch/x86/tools')
-rw-r--r--arch/x86/tools/gen-insn-attr-x86.awk50
1 files changed, 49 insertions, 1 deletions
diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
index a42015b305f4..af38469afd14 100644
--- a/arch/x86/tools/gen-insn-attr-x86.awk
+++ b/arch/x86/tools/gen-insn-attr-x86.awk
@@ -362,6 +362,9 @@ function convert_operands(count,opnd, i,j,imm,mod)
END {
if (awkchecked != "")
exit 1
+
+ print "#ifndef __BOOT_COMPRESSED\n"
+
# print escape opcode map's array
print "/* Escape opcode map array */"
print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX + 1]" \
@@ -388,6 +391,51 @@ END {
for (j = 0; j < max_lprefix; j++)
if (atable[i,j])
print " ["i"]["j"] = "atable[i,j]","
- print "};"
+ print "};\n"
+
+ print "#else /* !__BOOT_COMPRESSED */\n"
+
+ print "/* Escape opcode map array */"
+ print "static const insn_attr_t *inat_escape_tables[INAT_ESC_MAX + 1]" \
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "/* Group opcode map array */"
+ print "static const insn_attr_t *inat_group_tables[INAT_GRP_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "/* AVX opcode map array */"
+ print "static const insn_attr_t *inat_avx_tables[X86_VEX_M_MAX + 1]"\
+ "[INAT_LSTPFX_MAX + 1];"
+ print ""
+
+ print "static void inat_init_tables(void)"
+ print "{"
+
+ # print escape opcode map's array
+ print "\t/* Print Escape opcode map array */"
+ for (i = 0; i < geid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (etable[i,j])
+ print "\tinat_escape_tables["i"]["j"] = "etable[i,j]";"
+ print ""
+
+ # print group opcode map's array
+ print "\t/* Print Group opcode map array */"
+ for (i = 0; i < ggid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (gtable[i,j])
+ print "\tinat_group_tables["i"]["j"] = "gtable[i,j]";"
+ print ""
+ # print AVX opcode map's array
+ print "\t/* Print AVX opcode map array */"
+ for (i = 0; i < gaid; i++)
+ for (j = 0; j < max_lprefix; j++)
+ if (atable[i,j])
+ print "\tinat_avx_tables["i"]["j"] = "atable[i,j]";"
+
+ print "}"
+ print "#endif"
}