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authorRichard Henderson <richard.henderson@linaro.org>2020-10-28 12:05:44 -0700
committerRichard Henderson <richard.henderson@linaro.org>2021-01-07 05:09:41 -1000
commitdb0c51a380394b21b33a6294367aff03ab06b286 (patch)
tree532b0abe24deda387ecdc065461dd698967d39ea
parent4846cd37df83b24e65a42bb50e5f407cdb50da72 (diff)
downloadqemu-arm-db0c51a380394b21b33a6294367aff03ab06b286.tar.gz
tcg: Introduce tcg_splitwx_to_{rx,rw}
Add two helper functions, using a global variable to hold the displacement. The displacement is currently always 0, so no change in behaviour. Begin using the functions in tcg common code only. Reviewed-by: Joelle van Dyne <j@getutm.app> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
-rw-r--r--accel/tcg/cpu-exec.c2
-rw-r--r--accel/tcg/tcg-runtime.c2
-rw-r--r--accel/tcg/tcg-runtime.h2
-rw-r--r--accel/tcg/trace-events2
-rw-r--r--accel/tcg/translate-all.c33
-rw-r--r--disas.c4
-rw-r--r--include/disas/disas.h2
-rw-r--r--include/exec/exec-all.h2
-rw-r--r--include/exec/log.h2
-rw-r--r--include/tcg/tcg.h26
-rw-r--r--tcg/tcg-pool.c.inc6
-rw-r--r--tcg/tcg.c56
-rw-r--r--tcg/tci.c6
13 files changed, 105 insertions, 40 deletions
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index fa325bb3d8..f9344db283 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -161,7 +161,7 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb)
uintptr_t ret;
TranslationBlock *last_tb;
int tb_exit;
- uint8_t *tb_ptr = itb->tc.ptr;
+ const void *tb_ptr = itb->tc.ptr;
qemu_log_mask_and_addr(CPU_LOG_EXEC, itb->pc,
"Trace %d: %p ["
diff --git a/accel/tcg/tcg-runtime.c b/accel/tcg/tcg-runtime.c
index f85dfefeab..d736f4ff55 100644
--- a/accel/tcg/tcg-runtime.c
+++ b/accel/tcg/tcg-runtime.c
@@ -145,7 +145,7 @@ uint64_t HELPER(ctpop_i64)(uint64_t arg)
return ctpop64(arg);
}
-void *HELPER(lookup_tb_ptr)(CPUArchState *env)
+const void *HELPER(lookup_tb_ptr)(CPUArchState *env)
{
CPUState *cpu = env_cpu(env);
TranslationBlock *tb;
diff --git a/accel/tcg/tcg-runtime.h b/accel/tcg/tcg-runtime.h
index 2e36d6eb0c..91a5b7e85f 100644
--- a/accel/tcg/tcg-runtime.h
+++ b/accel/tcg/tcg-runtime.h
@@ -24,7 +24,7 @@ DEF_HELPER_FLAGS_1(clrsb_i64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(ctpop_i32, TCG_CALL_NO_RWG_SE, i32, i32)
DEF_HELPER_FLAGS_1(ctpop_i64, TCG_CALL_NO_RWG_SE, i64, i64)
-DEF_HELPER_FLAGS_1(lookup_tb_ptr, TCG_CALL_NO_WG_SE, ptr, env)
+DEF_HELPER_FLAGS_1(lookup_tb_ptr, TCG_CALL_NO_WG_SE, cptr, env)
DEF_HELPER_FLAGS_1(exit_atomic, TCG_CALL_NO_WG, noreturn, env)
diff --git a/accel/tcg/trace-events b/accel/tcg/trace-events
index 385b9f749b..6eefb37f5d 100644
--- a/accel/tcg/trace-events
+++ b/accel/tcg/trace-events
@@ -7,4 +7,4 @@ exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
exec_tb_exit(void *last_tb, unsigned int flags) "tb:%p flags=0x%x"
# translate-all.c
-translate_block(void *tb, uintptr_t pc, uint8_t *tb_code) "tb:%p, pc:0x%"PRIxPTR", tb_code:%p"
+translate_block(void *tb, uintptr_t pc, const void *tb_code) "tb:%p, pc:0x%"PRIxPTR", tb_code:%p"
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 3f9e25fa0c..c0a3c60e1e 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -269,9 +269,9 @@ static uint8_t *encode_sleb128(uint8_t *p, target_long val)
/* Decode a signed leb128 sequence at *PP; increment *PP past the
decoded value. Return the decoded value. */
-static target_long decode_sleb128(uint8_t **pp)
+static target_long decode_sleb128(const uint8_t **pp)
{
- uint8_t *p = *pp;
+ const uint8_t *p = *pp;
target_long val = 0;
int byte, shift = 0;
@@ -342,7 +342,7 @@ static int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
target_ulong data[TARGET_INSN_START_WORDS] = { tb->pc };
uintptr_t host_pc = (uintptr_t)tb->tc.ptr;
CPUArchState *env = cpu->env_ptr;
- uint8_t *p = tb->tc.ptr + tb->tc.size;
+ const uint8_t *p = tb->tc.ptr + tb->tc.size;
int i, j, num_insns = tb->icount;
#ifdef CONFIG_PROFILER
TCGProfile *prof = &tcg_ctx->prof;
@@ -393,7 +393,7 @@ void tb_destroy(TranslationBlock *tb)
bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc, bool will_exit)
{
/*
- * The host_pc has to be in the region of the code buffer.
+ * The host_pc has to be in the rx region of the code buffer.
* If it is not we will not be able to resolve it here.
* The two cases where host_pc will not be correct are:
*
@@ -402,7 +402,7 @@ bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc, bool will_exit)
*
* Either way we need return early as we can't resolve it here.
*/
- if (in_code_gen_buffer((const void *)host_pc)) {
+ if (in_code_gen_buffer((const void *)(host_pc - tcg_splitwx_diff))) {
TranslationBlock *tb = tcg_tb_lookup(host_pc);
if (tb) {
cpu_restore_state_from_tb(cpu, tb, host_pc, will_exit);
@@ -1712,7 +1712,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
}
gen_code_buf = tcg_ctx->code_gen_ptr;
- tb->tc.ptr = gen_code_buf;
+ tb->tc.ptr = tcg_splitwx_to_rx(gen_code_buf);
tb->pc = pc;
tb->cs_base = cs_base;
tb->flags = flags;
@@ -1806,15 +1806,19 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM) &&
qemu_log_in_addr_range(tb->pc)) {
FILE *logfile = qemu_log_lock();
- int code_size, data_size = 0;
+ int code_size, data_size;
+ const tcg_target_ulong *rx_data_gen_ptr;
size_t chunk_start;
int insn = 0;
if (tcg_ctx->data_gen_ptr) {
- code_size = tcg_ctx->data_gen_ptr - tb->tc.ptr;
+ rx_data_gen_ptr = tcg_splitwx_to_rx(tcg_ctx->data_gen_ptr);
+ code_size = (const void *)rx_data_gen_ptr - tb->tc.ptr;
data_size = gen_code_size - code_size;
} else {
+ rx_data_gen_ptr = 0;
code_size = gen_code_size;
+ data_size = 0;
}
/* Dump header and the first instruction */
@@ -1849,16 +1853,9 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
if (data_size) {
int i;
qemu_log(" data: [size=%d]\n", data_size);
- for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
- if (sizeof(tcg_target_ulong) == 8) {
- qemu_log("0x%08" PRIxPTR ": .quad 0x%016" PRIx64 "\n",
- (uintptr_t)tcg_ctx->data_gen_ptr + i,
- *(uint64_t *)(tcg_ctx->data_gen_ptr + i));
- } else {
- qemu_log("0x%08" PRIxPTR ": .long 0x%08x\n",
- (uintptr_t)tcg_ctx->data_gen_ptr + i,
- *(uint32_t *)(tcg_ctx->data_gen_ptr + i));
- }
+ for (i = 0; i < data_size / sizeof(tcg_target_ulong); i++) {
+ qemu_log("0x%08" PRIxPTR ": .quad 0x%" TCG_PRIlx "\n",
+ (uintptr_t)&rx_data_gen_ptr[i], rx_data_gen_ptr[i]);
}
}
qemu_log("\n");
diff --git a/disas.c b/disas.c
index 7c18d7d2a7..de1de7be94 100644
--- a/disas.c
+++ b/disas.c
@@ -299,8 +299,10 @@ char *plugin_disas(CPUState *cpu, uint64_t addr, size_t size)
}
/* Disassemble this for me please... (debugging). */
-void disas(FILE *out, void *code, unsigned long size)
+void disas(FILE *out, const void *ccode, unsigned long size)
{
+ /* TODO: Push constness through the disas backends. */
+ void *code = (void *)ccode;
uintptr_t pc;
int count;
CPUDebug s;
diff --git a/include/disas/disas.h b/include/disas/disas.h
index 36c33f6f19..d363e95ede 100644
--- a/include/disas/disas.h
+++ b/include/disas/disas.h
@@ -7,7 +7,7 @@
#include "cpu.h"
/* Disassemble this for me please... (debugging). */
-void disas(FILE *out, void *code, unsigned long size);
+void disas(FILE *out, const void *code, unsigned long size);
void target_disas(FILE *out, CPUState *cpu, target_ulong code,
target_ulong size);
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index fab573da06..2e5b4bba48 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -448,7 +448,7 @@ int probe_access_flags(CPUArchState *env, target_ulong addr,
* Note: the address of search data can be obtained by adding @size to @ptr.
*/
struct tb_tc {
- void *ptr; /* pointer to the translated code */
+ const void *ptr; /* pointer to the translated code */
size_t size;
};
diff --git a/include/exec/log.h b/include/exec/log.h
index e02fff5de1..3c7fa65ead 100644
--- a/include/exec/log.h
+++ b/include/exec/log.h
@@ -56,7 +56,7 @@ static inline void log_target_disas(CPUState *cpu, target_ulong start,
rcu_read_unlock();
}
-static inline void log_disas(void *code, unsigned long size)
+static inline void log_disas(const void *code, unsigned long size)
{
QemuLogFile *logfile;
rcu_read_lock();
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index ef571b6f3e..b769e868bc 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -678,6 +678,7 @@ struct TCGContext {
extern TCGContext tcg_init_ctx;
extern __thread TCGContext *tcg_ctx;
extern void *tcg_code_gen_epilogue;
+extern uintptr_t tcg_splitwx_diff;
extern TCGv_env cpu_env;
static inline bool in_code_gen_buffer(const void *p)
@@ -691,6 +692,21 @@ static inline bool in_code_gen_buffer(const void *p)
return (size_t)(p - s->code_gen_buffer) <= s->code_gen_buffer_size;
}
+#ifdef CONFIG_DEBUG_TCG
+const void *tcg_splitwx_to_rx(void *rw);
+void *tcg_splitwx_to_rw(const void *rx);
+#else
+static inline const void *tcg_splitwx_to_rx(void *rw)
+{
+ return rw ? rw + tcg_splitwx_diff : NULL;
+}
+
+static inline void *tcg_splitwx_to_rw(const void *rx)
+{
+ return rx ? (void *)rx - tcg_splitwx_diff : NULL;
+}
+#endif
+
static inline size_t temp_idx(TCGTemp *ts)
{
ptrdiff_t n = ts - tcg_ctx->temps;
@@ -1111,7 +1127,7 @@ static inline TCGLabel *arg_label(TCGArg i)
* correct result.
*/
-static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b)
+static inline ptrdiff_t tcg_ptr_byte_diff(const void *a, const void *b)
{
return a - b;
}
@@ -1125,9 +1141,9 @@ static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b)
* to the destination address.
*/
-static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, void *target)
+static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, const void *target)
{
- return tcg_ptr_byte_diff(target, s->code_ptr);
+ return tcg_ptr_byte_diff(target, tcg_splitwx_to_rx(s->code_ptr));
}
/**
@@ -1233,9 +1249,9 @@ static inline unsigned get_mmuidx(TCGMemOpIdx oi)
#define TB_EXIT_REQUESTED 3
#ifdef CONFIG_TCG_INTERPRETER
-uintptr_t tcg_qemu_tb_exec(CPUArchState *env, void *tb_ptr);
+uintptr_t tcg_qemu_tb_exec(CPUArchState *env, const void *tb_ptr);
#else
-typedef uintptr_t tcg_prologue_fn(CPUArchState *env, void *tb_ptr);
+typedef uintptr_t tcg_prologue_fn(CPUArchState *env, const void *tb_ptr);
extern tcg_prologue_fn *tcg_qemu_tb_exec;
#endif
diff --git a/tcg/tcg-pool.c.inc b/tcg/tcg-pool.c.inc
index 82cbcc89bd..90c2e63b7f 100644
--- a/tcg/tcg-pool.c.inc
+++ b/tcg/tcg-pool.c.inc
@@ -140,6 +140,8 @@ static int tcg_out_pool_finalize(TCGContext *s)
for (; p != NULL; p = p->next) {
size_t size = sizeof(tcg_target_ulong) * p->nlong;
+ uintptr_t value;
+
if (!l || l->nlong != p->nlong || memcmp(l->data, p->data, size)) {
if (unlikely(a > s->code_gen_highwater)) {
return -1;
@@ -148,7 +150,9 @@ static int tcg_out_pool_finalize(TCGContext *s)
a += size;
l = p;
}
- if (!patch_reloc(p->label, p->rtype, (intptr_t)a - size, p->addend)) {
+
+ value = (uintptr_t)tcg_splitwx_to_rx(a) - size;
+ if (!patch_reloc(p->label, p->rtype, value, p->addend)) {
return -2;
}
}
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 12f598cc18..7bf441979d 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -162,6 +162,7 @@ static TCGContext **tcg_ctxs;
static unsigned int n_tcg_ctxs;
TCGv_env cpu_env = 0;
void *tcg_code_gen_epilogue;
+uintptr_t tcg_splitwx_diff;
#ifndef CONFIG_TCG_INTERPRETER
tcg_prologue_fn *tcg_qemu_tb_exec;
@@ -406,8 +407,9 @@ static void tcg_region_trees_init(void)
}
}
-static struct tcg_region_tree *tc_ptr_to_region_tree(void *p)
+static struct tcg_region_tree *tc_ptr_to_region_tree(const void *cp)
{
+ void *p = tcg_splitwx_to_rw(cp);
size_t region_idx;
if (p < region.start_aligned) {
@@ -701,6 +703,7 @@ void tcg_region_init(void)
size_t region_size;
size_t n_regions;
size_t i;
+ uintptr_t splitwx_diff;
n_regions = tcg_n_regions();
@@ -731,6 +734,7 @@ void tcg_region_init(void)
region.end -= page_size;
/* set guard pages */
+ splitwx_diff = tcg_splitwx_diff;
for (i = 0; i < region.n; i++) {
void *start, *end;
int rc;
@@ -738,6 +742,10 @@ void tcg_region_init(void)
tcg_region_bounds(i, &start, &end);
rc = qemu_mprotect_none(end, page_size);
g_assert(!rc);
+ if (splitwx_diff) {
+ rc = qemu_mprotect_none(end + splitwx_diff, page_size);
+ g_assert(!rc);
+ }
}
tcg_region_trees_init();
@@ -752,6 +760,29 @@ void tcg_region_init(void)
#endif
}
+#ifdef CONFIG_DEBUG_TCG
+const void *tcg_splitwx_to_rx(void *rw)
+{
+ /* Pass NULL pointers unchanged. */
+ if (rw) {
+ g_assert(in_code_gen_buffer(rw));
+ rw += tcg_splitwx_diff;
+ }
+ return rw;
+}
+
+void *tcg_splitwx_to_rw(const void *rx)
+{
+ /* Pass NULL pointers unchanged. */
+ if (rx) {
+ rx -= tcg_splitwx_diff;
+ /* Assert that we end with a pointer in the rw region. */
+ g_assert(in_code_gen_buffer(rx));
+ }
+ return (void *)rx;
+}
+#endif /* CONFIG_DEBUG_TCG */
+
static void alloc_tcg_plugin_context(TCGContext *s)
{
#ifdef CONFIG_PLUGIN
@@ -1061,8 +1092,15 @@ void tcg_prologue_init(TCGContext *s)
s->code_buf = buf0;
s->data_gen_ptr = NULL;
+ /*
+ * The region trees are not yet configured, but tcg_splitwx_to_rx
+ * needs the bounds for an assert.
+ */
+ region.start = buf0;
+ region.end = buf0 + total_size;
+
#ifndef CONFIG_TCG_INTERPRETER
- tcg_qemu_tb_exec = (tcg_prologue_fn *)buf0;
+ tcg_qemu_tb_exec = (tcg_prologue_fn *)tcg_splitwx_to_rx(buf0);
#endif
/* Compute a high-water mark, at which we voluntarily flush the buffer
@@ -1087,7 +1125,7 @@ void tcg_prologue_init(TCGContext *s)
buf1 = s->code_ptr;
#ifndef CONFIG_TCG_INTERPRETER
- flush_idcache_range((uintptr_t)buf0, (uintptr_t)buf0,
+ flush_idcache_range((uintptr_t)tcg_splitwx_to_rx(buf0), (uintptr_t)buf0,
tcg_ptr_byte_diff(buf1, buf0));
#endif
@@ -4231,8 +4269,13 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
tcg_reg_alloc_start(s);
- s->code_buf = tb->tc.ptr;
- s->code_ptr = tb->tc.ptr;
+ /*
+ * Reset the buffer pointers when restarting after overflow.
+ * TODO: Move this into translate-all.c with the rest of the
+ * buffer management. Having only this done here is confusing.
+ */
+ s->code_buf = tcg_splitwx_to_rw(tb->tc.ptr);
+ s->code_ptr = s->code_buf;
#ifdef TCG_TARGET_NEED_LDST_LABELS
QSIMPLEQ_INIT(&s->ldst_labels);
@@ -4337,7 +4380,8 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
#ifndef CONFIG_TCG_INTERPRETER
/* flush instruction cache */
- flush_idcache_range((uintptr_t)s->code_buf, (uintptr_t)s->code_buf,
+ flush_idcache_range((uintptr_t)tcg_splitwx_to_rx(s->code_buf),
+ (uintptr_t)s->code_buf,
tcg_ptr_byte_diff(s->code_ptr, s->code_buf));
#endif
diff --git a/tcg/tci.c b/tcg/tci.c
index cf0440445d..017887bbc9 100644
--- a/tcg/tci.c
+++ b/tcg/tci.c
@@ -481,9 +481,11 @@ static bool tci_compare64(uint64_t u0, uint64_t u1, TCGCond condition)
* One possible operation in the pseudo code is a call to binary code.
* Therefore, disable CFI checks in the interpreter function
*/
-uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env, void *v_tb_ptr)
+uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
+ const void *v_tb_ptr)
{
- uint8_t *tb_ptr = v_tb_ptr;
+ /* TODO: Propagate const through this file. */
+ uint8_t *tb_ptr = (uint8_t *)v_tb_ptr;
tcg_target_ulong regs[TCG_TARGET_NB_REGS];
long tcg_temps[CPU_TEMP_BUF_NLONGS];
uintptr_t sp_value = (uintptr_t)(tcg_temps + CPU_TEMP_BUF_NLONGS);