This instruction type is created with img_reg_insn(). It's similar to
INSN_MOV_MEMBASE_REG but there is no register part in memory addressing, just
32-bit offset. It also uses GS segment for memory addressing (hence
THREAD_LOCAL).
This instruction will be used to load the value of a thread-specific pointer of
well known address.
Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
---
arch/x86/emit-code_32.c | 22 ++++++++++++++++++++++
arch/x86/include/arch/instruction.h | 1 +
arch/x86/lir-printer.c | 15 +++++++++++++++
arch/x86/use-def.c | 1 +
4 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/arch/x86/emit-code_32.c b/arch/x86/emit-code_32.c
index 2130ed8..cdf1c66 100644
--- a/arch/x86/emit-code_32.c
+++ b/arch/x86/emit-code_32.c
@@ -181,6 +181,19 @@ emit_reg_reg(struct buffer *buf, unsigned char opc,
}
static void
+__emit_memdisp_reg(struct buffer *buf, unsigned char opc, unsigned long disp,
+ unsigned char reg_opcode)
+{
+ unsigned char mod_rm;
+
+ mod_rm = encode_modrm(0, __encode_reg(reg_opcode), 5);
+
+ emit(buf, opc);
+ emit(buf, mod_rm);
+ emit_imm32(buf, disp);
+}
+
+static void
__emit_membase(struct buffer *buf, unsigned char opc,
enum machine_reg base_reg, unsigned long disp,
unsigned char reg_opcode)
@@ -284,6 +297,14 @@ static void emit_mov_membase_reg(struct buffer *buf,
emit_membase_reg(buf, 0x8b, src, dest);
}
+static void emit_mov_thread_local_memdisp_reg(struct buffer *buf,
+ struct operand *src,
+ struct operand *dest)
+{
+ emit(buf, 0x65); /* GS segemnt prefix */
+ __emit_memdisp_reg(buf, 0x8b, src->imm, mach_reg(&dest->reg));
+}
+
static void emit_mov_memindex_reg(struct buffer *buf,
struct operand *src, struct operand *dest)
{
@@ -925,6 +946,7 @@ static struct emitter emitters[] = {
DECL_EMITTER(INSN_MOV_IMM_REG, emit_mov_imm_reg, TWO_OPERANDS),
DECL_EMITTER(INSN_MOV_MEMLOCAL_REG, emit_mov_memlocal_reg,
TWO_OPERANDS),
DECL_EMITTER(INSN_MOV_MEMBASE_REG, emit_mov_membase_reg, TWO_OPERANDS),
+ DECL_EMITTER(INSN_MOV_THREAD_LOCAL_MEMDISP_REG,
emit_mov_thread_local_memdisp_reg, TWO_OPERANDS),
DECL_EMITTER(INSN_MOV_MEMINDEX_REG, emit_mov_memindex_reg,
TWO_OPERANDS),
DECL_EMITTER(INSN_MOV_REG_MEMBASE, emit_mov_reg_membase, TWO_OPERANDS),
DECL_EMITTER(INSN_MOV_REG_MEMINDEX, emit_mov_reg_memindex,
TWO_OPERANDS),
diff --git a/arch/x86/include/arch/instruction.h
b/arch/x86/include/arch/instruction.h
index f28fd81..8201d84 100644
--- a/arch/x86/include/arch/instruction.h
+++ b/arch/x86/include/arch/instruction.h
@@ -79,6 +79,7 @@ enum insn_type {
INSN_MOV_IMM_REG,
INSN_MOV_MEMLOCAL_REG,
INSN_MOV_MEMBASE_REG,
+ INSN_MOV_THREAD_LOCAL_MEMDISP_REG,
INSN_MOV_MEMINDEX_REG,
INSN_MOV_REG_MEMBASE,
INSN_MOV_REG_MEMINDEX,
diff --git a/arch/x86/lir-printer.c b/arch/x86/lir-printer.c
index 11b977b..910e8a5 100644
--- a/arch/x86/lir-printer.c
+++ b/arch/x86/lir-printer.c
@@ -95,6 +95,14 @@ static int print_membase_reg(struct string *str, struct insn
*insn)
return print_reg(str, &insn->dest);
}
+static int print_memdisp_reg(struct string *str, struct insn *insn)
+{
+ str_append(str, "(");
+ print_imm(str, &insn->src);
+ str_append(str, "), ");
+ return print_reg(str, &insn->dest);
+}
+
static int print_reg_membase(struct string *str, struct insn *insn)
{
print_reg(str, &insn->src);
@@ -291,6 +299,12 @@ static int print_mov_membase_reg(struct string *str,
struct insn *insn)
return print_membase_reg(str, insn);
}
+static int print_mov_memdisp_reg(struct string *str, struct insn *insn)
+{
+ print_func_name(str);
+ return print_memdisp_reg(str, insn);
+}
+
static int print_mov_memindex_reg(struct string *str, struct insn *insn)
{
print_func_name(str);
@@ -492,6 +506,7 @@ static print_insn_fn insn_printers[] = {
[INSN_MOV_IMM_REG] = print_mov_imm_reg,
[INSN_MOV_MEMLOCAL_REG] = print_mov_memlocal_reg,
[INSN_MOV_MEMBASE_REG] = print_mov_membase_reg,
+ [INSN_MOV_THREAD_LOCAL_MEMDISP_REG] = print_mov_memdisp_reg,
[INSN_MOV_MEMINDEX_REG] = print_mov_memindex_reg,
[INSN_MOV_REG_MEMBASE] = print_mov_reg_membase,
[INSN_MOV_REG_MEMINDEX] = print_mov_reg_memindex,
diff --git a/arch/x86/use-def.c b/arch/x86/use-def.c
index 1325494..a0555c9 100644
--- a/arch/x86/use-def.c
+++ b/arch/x86/use-def.c
@@ -54,6 +54,7 @@ static struct insn_info insn_infos[] = {
DECLARE_INFO(INSN_MOV_IMM_REG, DEF_DST),
DECLARE_INFO(INSN_MOV_MEMLOCAL_REG, USE_FP | DEF_DST),
DECLARE_INFO(INSN_MOV_MEMBASE_REG, USE_SRC | DEF_DST),
+ DECLARE_INFO(INSN_MOV_THREAD_LOCAL_MEMDISP_REG, USE_NONE | DEF_DST),
DECLARE_INFO(INSN_MOV_MEMINDEX_REG, USE_SRC | USE_IDX_SRC | DEF_DST),
DECLARE_INFO(INSN_MOV_REG_MEMINDEX, USE_SRC | USE_DST | USE_IDX_DST |
DEF_NONE),
DECLARE_INFO(INSN_MOV_REG_MEMLOCAL, USE_SRC),
--
1.6.0.6
------------------------------------------------------------------------------
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