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tcg/ppc: Support split-wx code generation
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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@rth7680
rth7680 committed Jan 7, 2021
1 parent 2d6f38e commit d54401d
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Showing 2 changed files with 31 additions and 24 deletions.
53 changes: 30 additions & 23 deletions tcg/ppc/tcg-target.c.inc
View file
Expand Up @@ -62,8 +62,6 @@
#define TCG_CT_CONST_MONE 0x2000
#define TCG_CT_CONST_WSZ 0x4000

static tcg_insn_unit *tb_ret_addr;

TCGPowerISA have_isa;
static bool have_isel;
bool have_altivec;
Expand Down Expand Up @@ -184,35 +182,41 @@ static inline bool in_range_b(tcg_target_long target)
return target == sextract64(target, 0, 26);
}

static uint32_t reloc_pc24_val(tcg_insn_unit *pc, const tcg_insn_unit *target)
static uint32_t reloc_pc24_val(const tcg_insn_unit *pc,
const tcg_insn_unit *target)
{
ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
tcg_debug_assert(in_range_b(disp));
return disp & 0x3fffffc;
}

static bool reloc_pc24(tcg_insn_unit *pc, tcg_insn_unit *target)
static bool reloc_pc24(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
{
ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
ptrdiff_t disp = tcg_ptr_byte_diff(target, src_rx);

if (in_range_b(disp)) {
*pc = (*pc & ~0x3fffffc) | (disp & 0x3fffffc);
*src_rw = (*src_rw & ~0x3fffffc) | (disp & 0x3fffffc);
return true;
}
return false;
}

static uint16_t reloc_pc14_val(tcg_insn_unit *pc, const tcg_insn_unit *target)
static uint16_t reloc_pc14_val(const tcg_insn_unit *pc,
const tcg_insn_unit *target)
{
ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
tcg_debug_assert(disp == (int16_t) disp);
return disp & 0xfffc;
}

static bool reloc_pc14(tcg_insn_unit *pc, tcg_insn_unit *target)
static bool reloc_pc14(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
{
ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
ptrdiff_t disp = tcg_ptr_byte_diff(target, src_rx);

if (disp == (int16_t) disp) {
*pc = (*pc & ~0xfffc) | (disp & 0xfffc);
*src_rw = (*src_rw & ~0xfffc) | (disp & 0xfffc);
return true;
}
return false;
Expand Down Expand Up @@ -673,12 +677,12 @@ static const uint32_t tcg_to_isel[] = {
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
tcg_insn_unit *target;
const tcg_insn_unit *target;
int16_t lo;
int32_t hi;

value += addend;
target = (tcg_insn_unit *)value;
target = (const tcg_insn_unit *)value;

switch (type) {
case R_PPC_REL14:
Expand Down Expand Up @@ -1544,7 +1548,7 @@ static void tcg_out_setcond(TCGContext *s, TCGType type, TCGCond cond,
static void tcg_out_bc(TCGContext *s, int bc, TCGLabel *l)
{
if (l->has_value) {
bc |= reloc_pc14_val(s->code_ptr, l->u.value_ptr);
bc |= reloc_pc14_val(tcg_splitwx_to_rx(s->code_ptr), l->u.value_ptr);
} else {
tcg_out_reloc(s, s->code_ptr, R_PPC_REL14, l, 0);
}
Expand Down Expand Up @@ -1997,7 +2001,8 @@ static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOpIdx oi,
label->datahi_reg = datahi_reg;
label->addrlo_reg = addrlo_reg;
label->addrhi_reg = addrhi_reg;
label->raddr = raddr;
/* TODO: Cast goes away when all hosts converted */
label->raddr = (void *)tcg_splitwx_to_rx(raddr);
label->label_ptr[0] = lptr;
}

Expand All @@ -2007,7 +2012,7 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
MemOp opc = get_memop(oi);
TCGReg hi, lo, arg = TCG_REG_R3;

if (!reloc_pc14(lb->label_ptr[0], s->code_ptr)) {
if (!reloc_pc14(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}

Expand Down Expand Up @@ -2055,7 +2060,7 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
MemOp s_bits = opc & MO_SIZE;
TCGReg hi, lo, arg = TCG_REG_R3;

if (!reloc_pc14(lb->label_ptr[0], s->code_ptr)) {
if (!reloc_pc14(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}

Expand Down Expand Up @@ -2306,10 +2311,10 @@ static void tcg_target_qemu_prologue(TCGContext *s)
int i;

#ifdef _CALL_AIX
void **desc = (void **)s->code_ptr;
desc[0] = desc + 2; /* entry point */
desc[1] = 0; /* environment pointer */
s->code_ptr = (void *)(desc + 2); /* skip over descriptor */
const void **desc = (const void **)s->code_ptr;
desc[0] = tcg_splitwx_to_rx(desc + 2); /* entry point */
desc[1] = 0; /* environment pointer */
s->code_ptr = (void *)(desc + 2); /* skip over descriptor */
#endif

tcg_set_frame(s, TCG_REG_CALL_STACK, REG_SAVE_BOT - CPU_TEMP_BUF_SIZE,
Expand Down Expand Up @@ -2341,7 +2346,8 @@ static void tcg_target_qemu_prologue(TCGContext *s)
tcg_out32(s, BCCTR | BO_ALWAYS);

/* Epilogue */
tcg_code_gen_epilogue = tb_ret_addr = s->code_ptr;
/* TODO: Cast goes away when all hosts converted */
tcg_code_gen_epilogue = (void *)tcg_splitwx_to_rx(s->code_ptr);

tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_R0, TCG_REG_R1, FRAME_SIZE+LR_OFFSET);
for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); ++i) {
Expand All @@ -2362,7 +2368,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
switch (opc) {
case INDEX_op_exit_tb:
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R3, args[0]);
tcg_out_b(s, 0, tb_ret_addr);
tcg_out_b(s, 0, tcg_code_gen_epilogue);
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_insn_offset) {
Expand Down Expand Up @@ -2410,7 +2416,8 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
uint32_t insn = B;

if (l->has_value) {
insn |= reloc_pc24_val(s->code_ptr, l->u.value_ptr);
insn |= reloc_pc24_val(tcg_splitwx_to_rx(s->code_ptr),
l->u.value_ptr);
} else {
tcg_out_reloc(s, s->code_ptr, R_PPC_REL24, l, 0);
}
Expand Down
2 changes: 1 addition & 1 deletion tcg/ppc/tcg-target.h
View file
Expand Up @@ -185,6 +185,6 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
#define TCG_TARGET_NEED_LDST_LABELS
#endif
#define TCG_TARGET_NEED_POOL_LABELS
#define TCG_TARGET_SUPPORT_MIRROR 0
#define TCG_TARGET_SUPPORT_MIRROR 1

#endif

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