| Message ID | 20240424233131.988727-14-richard.henderson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | accel/tcg: Improve disassembly for target and plugin | expand |
Cc'ing Pierrick & Alex on this last one :) On 25/4/24 01:31, Richard Henderson wrote: > We can delay the computation of haddr until the plugin > actually requests it. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > include/qemu/plugin.h | 4 ---- > accel/tcg/plugin-gen.c | 20 -------------------- > plugins/api.c | 25 ++++++++++++++++++++++++- > 3 files changed, 24 insertions(+), 25 deletions(-) > > diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h > index 03081be543..3db0e75d16 100644 > --- a/include/qemu/plugin.h > +++ b/include/qemu/plugin.h > @@ -98,7 +98,6 @@ struct qemu_plugin_dyn_cb { > /* Internal context for instrumenting an instruction */ > struct qemu_plugin_insn { > uint64_t vaddr; > - void *haddr; > GArray *insn_cbs; > GArray *mem_cbs; > uint8_t len; > @@ -119,9 +118,6 @@ struct qemu_plugin_tb { > GPtrArray *insns; > size_t n; > uint64_t vaddr; > - uint64_t vaddr2; > - void *haddr1; > - void *haddr2; > > /* if set, the TB calls helpers that might access guest memory */ > bool mem_helper; > diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c > index a4656859c6..b036773d3c 100644 > --- a/accel/tcg/plugin-gen.c > +++ b/accel/tcg/plugin-gen.c > @@ -319,9 +319,6 @@ bool plugin_gen_tb_start(CPUState *cpu, const DisasContextBase *db) > ret = true; > > ptb->vaddr = db->pc_first; > - ptb->vaddr2 = -1; > - ptb->haddr1 = db->host_addr[0]; > - ptb->haddr2 = NULL; > ptb->mem_helper = false; > > tcg_gen_plugin_cb(PLUGIN_GEN_FROM_TB); > @@ -363,23 +360,6 @@ void plugin_gen_insn_start(CPUState *cpu, const DisasContextBase *db) > pc = db->pc_next; > insn->vaddr = pc; > > - /* > - * Detect page crossing to get the new host address. > - * Note that we skip this when haddr1 == NULL, e.g. when we're > - * fetching instructions from a region not backed by RAM. > - */ > - if (ptb->haddr1 == NULL) { > - insn->haddr = NULL; > - } else if (is_same_page(db, db->pc_next)) { > - insn->haddr = ptb->haddr1 + pc - ptb->vaddr; > - } else { > - if (ptb->vaddr2 == -1) { > - ptb->vaddr2 = TARGET_PAGE_ALIGN(db->pc_first); > - get_page_addr_code_hostp(cpu_env(cpu), ptb->vaddr2, &ptb->haddr2); > - } > - insn->haddr = ptb->haddr2 + pc - ptb->vaddr2; > - } > - > tcg_gen_plugin_cb(PLUGIN_GEN_FROM_INSN); > } > > diff --git a/plugins/api.c b/plugins/api.c > index 39895a1cb1..4b6690c7d6 100644 > --- a/plugins/api.c > +++ b/plugins/api.c > @@ -242,7 +242,30 @@ uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn) > > void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn) > { > - return insn->haddr; > + const DisasContextBase *db = tcg_ctx->plugin_db; > + vaddr page0_last = db->pc_first | ~TARGET_PAGE_MASK; > + > + if (db->fake_insn) { > + return NULL; > + } > + > + /* > + * ??? The return value is not intended for use of host memory, > + * but as a proxy for address space and physical address. > + * Thus we are only interested in the first byte and do not > + * care about spanning pages. > + */ > + if (insn->vaddr <= page0_last) { > + if (db->host_addr[0] == NULL) { > + return NULL; > + } > + return db->host_addr[0] + insn->vaddr - db->pc_first; > + } else { > + if (db->host_addr[1] == NULL) { > + return NULL; > + } > + return db->host_addr[1] + insn->vaddr - (page0_last + 1); > + } > } > > char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn)
On 4/24/24 16:31, Richard Henderson wrote: > We can delay the computation of haddr until the plugin > actually requests it. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > include/qemu/plugin.h | 4 ---- > accel/tcg/plugin-gen.c | 20 -------------------- > plugins/api.c | 25 ++++++++++++++++++++++++- > 3 files changed, 24 insertions(+), 25 deletions(-) > > diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h > index 03081be543..3db0e75d16 100644 > --- a/include/qemu/plugin.h > +++ b/include/qemu/plugin.h > @@ -98,7 +98,6 @@ struct qemu_plugin_dyn_cb { > /* Internal context for instrumenting an instruction */ > struct qemu_plugin_insn { > uint64_t vaddr; > - void *haddr; > GArray *insn_cbs; > GArray *mem_cbs; > uint8_t len; > @@ -119,9 +118,6 @@ struct qemu_plugin_tb { > GPtrArray *insns; > size_t n; > uint64_t vaddr; > - uint64_t vaddr2; > - void *haddr1; > - void *haddr2; > > /* if set, the TB calls helpers that might access guest memory */ > bool mem_helper; > diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c > index a4656859c6..b036773d3c 100644 > --- a/accel/tcg/plugin-gen.c > +++ b/accel/tcg/plugin-gen.c > @@ -319,9 +319,6 @@ bool plugin_gen_tb_start(CPUState *cpu, const DisasContextBase *db) > ret = true; > > ptb->vaddr = db->pc_first; > - ptb->vaddr2 = -1; > - ptb->haddr1 = db->host_addr[0]; > - ptb->haddr2 = NULL; > ptb->mem_helper = false; > > tcg_gen_plugin_cb(PLUGIN_GEN_FROM_TB); > @@ -363,23 +360,6 @@ void plugin_gen_insn_start(CPUState *cpu, const DisasContextBase *db) > pc = db->pc_next; > insn->vaddr = pc; > > - /* > - * Detect page crossing to get the new host address. > - * Note that we skip this when haddr1 == NULL, e.g. when we're > - * fetching instructions from a region not backed by RAM. > - */ > - if (ptb->haddr1 == NULL) { > - insn->haddr = NULL; > - } else if (is_same_page(db, db->pc_next)) { > - insn->haddr = ptb->haddr1 + pc - ptb->vaddr; > - } else { > - if (ptb->vaddr2 == -1) { > - ptb->vaddr2 = TARGET_PAGE_ALIGN(db->pc_first); > - get_page_addr_code_hostp(cpu_env(cpu), ptb->vaddr2, &ptb->haddr2); > - } > - insn->haddr = ptb->haddr2 + pc - ptb->vaddr2; > - } > - > tcg_gen_plugin_cb(PLUGIN_GEN_FROM_INSN); > } > > diff --git a/plugins/api.c b/plugins/api.c > index 39895a1cb1..4b6690c7d6 100644 > --- a/plugins/api.c > +++ b/plugins/api.c > @@ -242,7 +242,30 @@ uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn) > > void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn) > { > - return insn->haddr; > + const DisasContextBase *db = tcg_ctx->plugin_db; > + vaddr page0_last = db->pc_first | ~TARGET_PAGE_MASK; > + > + if (db->fake_insn) { > + return NULL; > + } > + > + /* > + * ??? The return value is not intended for use of host memory, > + * but as a proxy for address space and physical address. > + * Thus we are only interested in the first byte and do not > + * care about spanning pages. > + */ > + if (insn->vaddr <= page0_last) { > + if (db->host_addr[0] == NULL) { > + return NULL; > + } > + return db->host_addr[0] + insn->vaddr - db->pc_first; > + } else { > + if (db->host_addr[1] == NULL) { > + return NULL; > + } > + return db->host_addr[1] + insn->vaddr - (page0_last + 1); > + } > } > > char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn) Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index 03081be543..3db0e75d16 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -98,7 +98,6 @@ struct qemu_plugin_dyn_cb { /* Internal context for instrumenting an instruction */ struct qemu_plugin_insn { uint64_t vaddr; - void *haddr; GArray *insn_cbs; GArray *mem_cbs; uint8_t len; @@ -119,9 +118,6 @@ struct qemu_plugin_tb { GPtrArray *insns; size_t n; uint64_t vaddr; - uint64_t vaddr2; - void *haddr1; - void *haddr2; /* if set, the TB calls helpers that might access guest memory */ bool mem_helper; diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c index a4656859c6..b036773d3c 100644 --- a/accel/tcg/plugin-gen.c +++ b/accel/tcg/plugin-gen.c @@ -319,9 +319,6 @@ bool plugin_gen_tb_start(CPUState *cpu, const DisasContextBase *db) ret = true; ptb->vaddr = db->pc_first; - ptb->vaddr2 = -1; - ptb->haddr1 = db->host_addr[0]; - ptb->haddr2 = NULL; ptb->mem_helper = false; tcg_gen_plugin_cb(PLUGIN_GEN_FROM_TB); @@ -363,23 +360,6 @@ void plugin_gen_insn_start(CPUState *cpu, const DisasContextBase *db) pc = db->pc_next; insn->vaddr = pc; - /* - * Detect page crossing to get the new host address. - * Note that we skip this when haddr1 == NULL, e.g. when we're - * fetching instructions from a region not backed by RAM. - */ - if (ptb->haddr1 == NULL) { - insn->haddr = NULL; - } else if (is_same_page(db, db->pc_next)) { - insn->haddr = ptb->haddr1 + pc - ptb->vaddr; - } else { - if (ptb->vaddr2 == -1) { - ptb->vaddr2 = TARGET_PAGE_ALIGN(db->pc_first); - get_page_addr_code_hostp(cpu_env(cpu), ptb->vaddr2, &ptb->haddr2); - } - insn->haddr = ptb->haddr2 + pc - ptb->vaddr2; - } - tcg_gen_plugin_cb(PLUGIN_GEN_FROM_INSN); } diff --git a/plugins/api.c b/plugins/api.c index 39895a1cb1..4b6690c7d6 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -242,7 +242,30 @@ uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn) void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn) { - return insn->haddr; + const DisasContextBase *db = tcg_ctx->plugin_db; + vaddr page0_last = db->pc_first | ~TARGET_PAGE_MASK; + + if (db->fake_insn) { + return NULL; + } + + /* + * ??? The return value is not intended for use of host memory, + * but as a proxy for address space and physical address. + * Thus we are only interested in the first byte and do not + * care about spanning pages. + */ + if (insn->vaddr <= page0_last) { + if (db->host_addr[0] == NULL) { + return NULL; + } + return db->host_addr[0] + insn->vaddr - db->pc_first; + } else { + if (db->host_addr[1] == NULL) { + return NULL; + } + return db->host_addr[1] + insn->vaddr - (page0_last + 1); + } } char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn)
We can delay the computation of haddr until the plugin actually requests it. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- include/qemu/plugin.h | 4 ---- accel/tcg/plugin-gen.c | 20 -------------------- plugins/api.c | 25 ++++++++++++++++++++++++- 3 files changed, 24 insertions(+), 25 deletions(-)