| Message ID | 1534953837-16425-1-git-send-email-robert.walker@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | perf: Support for Arm A32/T32 instruction sets in CoreSight trace | expand |
Hi Robert, Your patch landed in the middle of the merge window and will have to be sent again rebased on 4.19-rc1 and long with minor fix found below. Regards, Mathieu On Wed, Aug 22, 2018 at 05:03:57PM +0100, Robert Walker wrote: > This patch adds support for generating instruction samples from trace of > AArch32 programs using the A32 and T32 instruction sets. > > T32 has variable 2 or 4 byte instruction size, so the conversion between > addresses and instruction counts requires extra information from the trace > decoder, requiring version 0.9.1 of OpenCSD. A check for the new struct > member has been added to the feature check for OpenCSD. > > Signed-off-by: Robert Walker <robert.walker@arm.com> > --- > tools/build/feature/test-libopencsd.c | 7 +++ > tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 27 ++++++++++ > tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 10 ++++ > tools/perf/util/cs-etm.c | 71 +++++++++++-------------- > 4 files changed, 75 insertions(+), 40 deletions(-) > > diff --git a/tools/build/feature/test-libopencsd.c b/tools/build/feature/test-libopencsd.c > index 5ff1246..d96b2df 100644 > --- a/tools/build/feature/test-libopencsd.c > +++ b/tools/build/feature/test-libopencsd.c > @@ -3,6 +3,13 @@ > > int main(void) > { > + /* > + * Requires ocsd_generic_trace_elem.num_instr_range introduced in > + * OpenCSD 0.9 > + */ > + ocsd_generic_trace_elem elem; > + (void)elem.num_instr_range; > + I really like this - simple and efficient. > (void)ocsd_get_version(); > return 0; > } > diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c > index 938def6..73d8384 100644 > --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c > +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c > @@ -263,9 +263,12 @@ static void cs_etm_decoder__clear_buffer(struct cs_etm_decoder *decoder) > decoder->tail = 0; > decoder->packet_count = 0; > for (i = 0; i < MAX_BUFFER; i++) { > + decoder->packet_buffer[i].isa = CS_ETM_ISA_UNKNOWN; > decoder->packet_buffer[i].start_addr = CS_ETM_INVAL_ADDR; > decoder->packet_buffer[i].end_addr = CS_ETM_INVAL_ADDR; > + decoder->packet_buffer[i].instr_count = 0; > decoder->packet_buffer[i].last_instr_taken_branch = false; > + decoder->packet_buffer[i].last_instr_size = 0; > decoder->packet_buffer[i].exc = false; > decoder->packet_buffer[i].exc_ret = false; > decoder->packet_buffer[i].cpu = INT_MIN; > @@ -294,11 +297,13 @@ cs_etm_decoder__buffer_packet(struct cs_etm_decoder *decoder, > decoder->packet_count++; > > decoder->packet_buffer[et].sample_type = sample_type; > + decoder->packet_buffer[et].isa = CS_ETM_ISA_UNKNOWN; > decoder->packet_buffer[et].exc = false; > decoder->packet_buffer[et].exc_ret = false; > decoder->packet_buffer[et].cpu = *((int *)inode->priv); > decoder->packet_buffer[et].start_addr = CS_ETM_INVAL_ADDR; > decoder->packet_buffer[et].end_addr = CS_ETM_INVAL_ADDR; > + decoder->packet_buffer[et].instr_count = 0; > > if (decoder->packet_count == MAX_BUFFER - 1) > return OCSD_RESP_WAIT; > @@ -321,8 +326,28 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, > > packet = &decoder->packet_buffer[decoder->tail]; > > + switch (elem->isa) { > + case ocsd_isa_aarch64: > + packet->isa = CS_ETM_ISA_A64; > + break; > + case ocsd_isa_arm: > + packet->isa = CS_ETM_ISA_A32; > + break; > + case ocsd_isa_thumb2: > + packet->isa = CS_ETM_ISA_T32; > + break; > + case ocsd_isa_tee: > + case ocsd_isa_jazelle: > + case ocsd_isa_custom: > + case ocsd_isa_unknown: > + default: > + packet->isa = CS_ETM_ISA_UNKNOWN; > + } > + > packet->start_addr = elem->st_addr; > packet->end_addr = elem->en_addr; > + packet->instr_count = elem->num_instr_range; > + > switch (elem->last_i_type) { > case OCSD_INSTR_BR: > case OCSD_INSTR_BR_INDIRECT: > @@ -336,6 +361,8 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, > break; > } > > + packet->last_instr_size = elem->last_instr_sz; > + > return ret; > } > > diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h > index 612b575..9a10eda 100644 > --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h > +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h > @@ -28,11 +28,21 @@ enum cs_etm_sample_type { > CS_ETM_TRACE_ON = 1 << 1, > }; > > +enum cs_etm_isa { > + CS_ETM_ISA_UNKNOWN, > + CS_ETM_ISA_A64, > + CS_ETM_ISA_A32, > + CS_ETM_ISA_T32, > +}; > + > struct cs_etm_packet { > enum cs_etm_sample_type sample_type; > + enum cs_etm_isa isa; > u64 start_addr; > u64 end_addr; > + u64 instr_count; Shouldn't this be a u32 since ocsd_generic_trace_elem::num_instr_range is a uint32_t in the openCSD library? > u8 last_instr_taken_branch; > + u8 last_instr_size; > u8 exc; > u8 exc_ret; > int cpu; > diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c > index 2ae6402..579f52a 100644 > --- a/tools/perf/util/cs-etm.c > +++ b/tools/perf/util/cs-etm.c > @@ -31,14 +31,6 @@ > > #define MAX_TIMESTAMP (~0ULL) > > -/* > - * A64 instructions are always 4 bytes > - * > - * Only A64 is supported, so can use this constant for converting between > - * addresses and instruction counts, calculting offsets etc > - */ > -#define A64_INSTR_SIZE 4 > - > struct cs_etm_auxtrace { > struct auxtrace auxtrace; > struct auxtrace_queues queues; > @@ -492,21 +484,16 @@ static inline void cs_etm__reset_last_branch_rb(struct cs_etm_queue *etmq) > etmq->last_branch_rb->nr = 0; > } > > -static inline u64 cs_etm__last_executed_instr(struct cs_etm_packet *packet) > -{ > - /* Returns 0 for the CS_ETM_TRACE_ON packet */ > - if (packet->sample_type == CS_ETM_TRACE_ON) > - return 0; > +static inline int cs_etm__t32_instr_size(struct cs_etm_queue *etmq, > + u64 addr) { > + u8 instrBytes[2]; > > - /* > - * The packet records the execution range with an exclusive end address > - * > - * A64 instructions are constant size, so the last executed > - * instruction is A64_INSTR_SIZE before the end address > - * Will need to do instruction level decode for T32 instructions as > - * they can be variable size (not yet supported). > + cs_etm__mem_access(etmq, addr, 2, instrBytes); Please use ARRAY_SIZE(), although trivial here it is just a matter of time before someone else submits a patch for it. > + /* T32 instruction size is indicated by bits[15:11] of the first > + * 16-bit word of the instruction: 0b11101, 0b11110 and 0b11111 > + * denote a 32-bit instruction. > */ Thanks for the documentation. > - return packet->end_addr - A64_INSTR_SIZE; > + return ((instrBytes[1] & 0xF8) >= 0xE8) ? 4 : 2; > } > > static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) > @@ -518,27 +505,32 @@ static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) > return packet->start_addr; > } > > -static inline u64 cs_etm__instr_count(const struct cs_etm_packet *packet) > +static inline > +u64 cs_etm__last_executed_instr(const struct cs_etm_packet *packet) > { > - /* > - * Only A64 instructions are currently supported, so can get > - * instruction count by dividing. > - * Will need to do instruction level decode for T32 instructions as > - * they can be variable size (not yet supported). > - */ > - return (packet->end_addr - packet->start_addr) / A64_INSTR_SIZE; > + /* Returns 0 for the CS_ETM_TRACE_ON packet */ > + if (packet->sample_type == CS_ETM_TRACE_ON) > + return 0; > + > + return packet->end_addr - packet->last_instr_size; > } > > -static inline u64 cs_etm__instr_addr(const struct cs_etm_packet *packet, > +static inline u64 cs_etm__instr_addr(struct cs_etm_queue *etmq, > + const struct cs_etm_packet *packet, > u64 offset) > { > - /* > - * Only A64 instructions are currently supported, so can get > - * instruction address by muliplying. > - * Will need to do instruction level decode for T32 instructions as > - * they can be variable size (not yet supported). > - */ > - return packet->start_addr + offset * A64_INSTR_SIZE; > + if (packet->isa == CS_ETM_ISA_T32) { > + u64 addr = packet->start_addr; > + > + while (offset > 0) { > + addr += cs_etm__t32_instr_size(etmq, addr); > + offset--; > + } > + return addr; > + } > + > + /* Assume a 4 byte instruction size (A32/A64) */ > + return packet->start_addr + offset * 4; > } > > static void cs_etm__update_last_branch_rb(struct cs_etm_queue *etmq) > @@ -867,9 +859,8 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) > struct cs_etm_auxtrace *etm = etmq->etm; > struct cs_etm_packet *tmp; > int ret; > - u64 instrs_executed; > + u64 instrs_executed = etmq->packet->instr_count; > > - instrs_executed = cs_etm__instr_count(etmq->packet); > etmq->period_instructions += instrs_executed; > > /* > @@ -899,7 +890,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) > * executed, but PC has not advanced to next instruction) > */ > u64 offset = (instrs_executed - instrs_over - 1); > - u64 addr = cs_etm__instr_addr(etmq->packet, offset); > + u64 addr = cs_etm__instr_addr(etmq, etmq->packet, offset); > > ret = cs_etm__synth_instruction_sample( > etmq, addr, etm->instructions_sample_period); > -- > 2.7.4 >
diff --git a/tools/build/feature/test-libopencsd.c b/tools/build/feature/test-libopencsd.c index 5ff1246..d96b2df 100644 --- a/tools/build/feature/test-libopencsd.c +++ b/tools/build/feature/test-libopencsd.c @@ -3,6 +3,13 @@ int main(void) { + /* + * Requires ocsd_generic_trace_elem.num_instr_range introduced in + * OpenCSD 0.9 + */ + ocsd_generic_trace_elem elem; + (void)elem.num_instr_range; + (void)ocsd_get_version(); return 0; } diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index 938def6..73d8384 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -263,9 +263,12 @@ static void cs_etm_decoder__clear_buffer(struct cs_etm_decoder *decoder) decoder->tail = 0; decoder->packet_count = 0; for (i = 0; i < MAX_BUFFER; i++) { + decoder->packet_buffer[i].isa = CS_ETM_ISA_UNKNOWN; decoder->packet_buffer[i].start_addr = CS_ETM_INVAL_ADDR; decoder->packet_buffer[i].end_addr = CS_ETM_INVAL_ADDR; + decoder->packet_buffer[i].instr_count = 0; decoder->packet_buffer[i].last_instr_taken_branch = false; + decoder->packet_buffer[i].last_instr_size = 0; decoder->packet_buffer[i].exc = false; decoder->packet_buffer[i].exc_ret = false; decoder->packet_buffer[i].cpu = INT_MIN; @@ -294,11 +297,13 @@ cs_etm_decoder__buffer_packet(struct cs_etm_decoder *decoder, decoder->packet_count++; decoder->packet_buffer[et].sample_type = sample_type; + decoder->packet_buffer[et].isa = CS_ETM_ISA_UNKNOWN; decoder->packet_buffer[et].exc = false; decoder->packet_buffer[et].exc_ret = false; decoder->packet_buffer[et].cpu = *((int *)inode->priv); decoder->packet_buffer[et].start_addr = CS_ETM_INVAL_ADDR; decoder->packet_buffer[et].end_addr = CS_ETM_INVAL_ADDR; + decoder->packet_buffer[et].instr_count = 0; if (decoder->packet_count == MAX_BUFFER - 1) return OCSD_RESP_WAIT; @@ -321,8 +326,28 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, packet = &decoder->packet_buffer[decoder->tail]; + switch (elem->isa) { + case ocsd_isa_aarch64: + packet->isa = CS_ETM_ISA_A64; + break; + case ocsd_isa_arm: + packet->isa = CS_ETM_ISA_A32; + break; + case ocsd_isa_thumb2: + packet->isa = CS_ETM_ISA_T32; + break; + case ocsd_isa_tee: + case ocsd_isa_jazelle: + case ocsd_isa_custom: + case ocsd_isa_unknown: + default: + packet->isa = CS_ETM_ISA_UNKNOWN; + } + packet->start_addr = elem->st_addr; packet->end_addr = elem->en_addr; + packet->instr_count = elem->num_instr_range; + switch (elem->last_i_type) { case OCSD_INSTR_BR: case OCSD_INSTR_BR_INDIRECT: @@ -336,6 +361,8 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, break; } + packet->last_instr_size = elem->last_instr_sz; + return ret; } diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h index 612b575..9a10eda 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h @@ -28,11 +28,21 @@ enum cs_etm_sample_type { CS_ETM_TRACE_ON = 1 << 1, }; +enum cs_etm_isa { + CS_ETM_ISA_UNKNOWN, + CS_ETM_ISA_A64, + CS_ETM_ISA_A32, + CS_ETM_ISA_T32, +}; + struct cs_etm_packet { enum cs_etm_sample_type sample_type; + enum cs_etm_isa isa; u64 start_addr; u64 end_addr; + u64 instr_count; u8 last_instr_taken_branch; + u8 last_instr_size; u8 exc; u8 exc_ret; int cpu; diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 2ae6402..579f52a 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -31,14 +31,6 @@ #define MAX_TIMESTAMP (~0ULL) -/* - * A64 instructions are always 4 bytes - * - * Only A64 is supported, so can use this constant for converting between - * addresses and instruction counts, calculting offsets etc - */ -#define A64_INSTR_SIZE 4 - struct cs_etm_auxtrace { struct auxtrace auxtrace; struct auxtrace_queues queues; @@ -492,21 +484,16 @@ static inline void cs_etm__reset_last_branch_rb(struct cs_etm_queue *etmq) etmq->last_branch_rb->nr = 0; } -static inline u64 cs_etm__last_executed_instr(struct cs_etm_packet *packet) -{ - /* Returns 0 for the CS_ETM_TRACE_ON packet */ - if (packet->sample_type == CS_ETM_TRACE_ON) - return 0; +static inline int cs_etm__t32_instr_size(struct cs_etm_queue *etmq, + u64 addr) { + u8 instrBytes[2]; - /* - * The packet records the execution range with an exclusive end address - * - * A64 instructions are constant size, so the last executed - * instruction is A64_INSTR_SIZE before the end address - * Will need to do instruction level decode for T32 instructions as - * they can be variable size (not yet supported). + cs_etm__mem_access(etmq, addr, 2, instrBytes); + /* T32 instruction size is indicated by bits[15:11] of the first + * 16-bit word of the instruction: 0b11101, 0b11110 and 0b11111 + * denote a 32-bit instruction. */ - return packet->end_addr - A64_INSTR_SIZE; + return ((instrBytes[1] & 0xF8) >= 0xE8) ? 4 : 2; } static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) @@ -518,27 +505,32 @@ static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) return packet->start_addr; } -static inline u64 cs_etm__instr_count(const struct cs_etm_packet *packet) +static inline +u64 cs_etm__last_executed_instr(const struct cs_etm_packet *packet) { - /* - * Only A64 instructions are currently supported, so can get - * instruction count by dividing. - * Will need to do instruction level decode for T32 instructions as - * they can be variable size (not yet supported). - */ - return (packet->end_addr - packet->start_addr) / A64_INSTR_SIZE; + /* Returns 0 for the CS_ETM_TRACE_ON packet */ + if (packet->sample_type == CS_ETM_TRACE_ON) + return 0; + + return packet->end_addr - packet->last_instr_size; } -static inline u64 cs_etm__instr_addr(const struct cs_etm_packet *packet, +static inline u64 cs_etm__instr_addr(struct cs_etm_queue *etmq, + const struct cs_etm_packet *packet, u64 offset) { - /* - * Only A64 instructions are currently supported, so can get - * instruction address by muliplying. - * Will need to do instruction level decode for T32 instructions as - * they can be variable size (not yet supported). - */ - return packet->start_addr + offset * A64_INSTR_SIZE; + if (packet->isa == CS_ETM_ISA_T32) { + u64 addr = packet->start_addr; + + while (offset > 0) { + addr += cs_etm__t32_instr_size(etmq, addr); + offset--; + } + return addr; + } + + /* Assume a 4 byte instruction size (A32/A64) */ + return packet->start_addr + offset * 4; } static void cs_etm__update_last_branch_rb(struct cs_etm_queue *etmq) @@ -867,9 +859,8 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) struct cs_etm_auxtrace *etm = etmq->etm; struct cs_etm_packet *tmp; int ret; - u64 instrs_executed; + u64 instrs_executed = etmq->packet->instr_count; - instrs_executed = cs_etm__instr_count(etmq->packet); etmq->period_instructions += instrs_executed; /* @@ -899,7 +890,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) * executed, but PC has not advanced to next instruction) */ u64 offset = (instrs_executed - instrs_over - 1); - u64 addr = cs_etm__instr_addr(etmq->packet, offset); + u64 addr = cs_etm__instr_addr(etmq, etmq->packet, offset); ret = cs_etm__synth_instruction_sample( etmq, addr, etm->instructions_sample_period);
This patch adds support for generating instruction samples from trace of AArch32 programs using the A32 and T32 instruction sets. T32 has variable 2 or 4 byte instruction size, so the conversion between addresses and instruction counts requires extra information from the trace decoder, requiring version 0.9.1 of OpenCSD. A check for the new struct member has been added to the feature check for OpenCSD. Signed-off-by: Robert Walker <robert.walker@arm.com> --- tools/build/feature/test-libopencsd.c | 7 +++ tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 27 ++++++++++ tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 10 ++++ tools/perf/util/cs-etm.c | 71 +++++++++++-------------- 4 files changed, 75 insertions(+), 40 deletions(-)