* [Qemu-devel] [Bug 597362] [NEW] qemu-system-sparc singlestep not work in gdbstub
@ 2010-06-22 17:31 Vitaliy
2017-01-10 8:57 ` [Qemu-devel] [Bug 597362] " Thomas Huth
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Vitaliy @ 2010-06-22 17:31 UTC (permalink / raw)
To: qemu-devel
Public bug reported:
Debugging with gdb-stub does not work with qemu-system-sparc target
Qemu compiled from current git tree.
execution string: qemu-system-sparc.exe -s -S -m 256 -L Bios -hda
sparc.img -boot c
connect with telnet localhost 1234
enter '$s#73' (without quotes, this is single step command to gdb stub)
gdb stub reply '+' (without quotes, as it accept command)
After this qemu continuously execute instructions in single step mode
and does not exit to gdb stub after each executed instruction with
interrupt signal
("T%02xthread:%02x;" /gdb_vm_state_change in gdbstub.c/ );
If we look at target-sparc/translate.c, we can see that
gen_helper_debug() is not called in single step mode:
========================
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
(npc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
!s->singlestep) {
/* jump to same page: we can use a direct jump */
tcg_gen_goto_tb(tb_num);
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb((long)tb + tb_num);
} else {
/* jump to another page: currently not optimized */
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb(0);
}
=========================
========================
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->singlestep) {
break;
}
========================
If we look similar code at target-sh4/translate.c we can see that is
called in this cases:
========================
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
!ctx->singlestep_enabled) {
/* Use a direct jump if in same page and singlestep not enabled */
tcg_gen_goto_tb(n);
tcg_gen_movi_i32(cpu_pc, dest);
tcg_gen_exit_tb((long) tb + n);
} else {
tcg_gen_movi_i32(cpu_pc, dest);
if (ctx->singlestep_enabled)
gen_helper_debug();
tcg_gen_exit_tb(0);
}
========================
========================
if (tb->cflags & CF_LAST_IO)
gen_io_end();
if (env->singlestep_enabled) {
tcg_gen_movi_i32(cpu_pc, ctx.pc);
gen_helper_debug();
} else {
==========================
** Affects: qemu
Importance: Undecided
Status: New
--
qemu-system-sparc singlestep not work in gdbstub
https://bugs.launchpad.net/bugs/597362
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
Status in QEMU: New
Bug description:
Debugging with gdb-stub does not work with qemu-system-sparc target
Qemu compiled from current git tree.
execution string: qemu-system-sparc.exe -s -S -m 256 -L Bios -hda
sparc.img -boot c
connect with telnet localhost 1234
enter '$s#73' (without quotes, this is single step command to gdb stub)
gdb stub reply '+' (without quotes, as it accept command)
After this qemu continuously execute instructions in single step mode
and does not exit to gdb stub after each executed instruction with
interrupt signal
("T%02xthread:%02x;" /gdb_vm_state_change in gdbstub.c/ );
If we look at target-sparc/translate.c, we can see that
gen_helper_debug() is not called in single step mode:
========================
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
(npc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
!s->singlestep) {
/* jump to same page: we can use a direct jump */
tcg_gen_goto_tb(tb_num);
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb((long)tb + tb_num);
} else {
/* jump to another page: currently not optimized */
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb(0);
}
=========================
========================
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->singlestep) {
break;
}
========================
If we look similar code at target-sh4/translate.c we can see that is
called in this cases:
========================
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
!ctx->singlestep_enabled) {
/* Use a direct jump if in same page and singlestep not enabled */
tcg_gen_goto_tb(n);
tcg_gen_movi_i32(cpu_pc, dest);
tcg_gen_exit_tb((long) tb + n);
} else {
tcg_gen_movi_i32(cpu_pc, dest);
if (ctx->singlestep_enabled)
gen_helper_debug();
tcg_gen_exit_tb(0);
}
========================
========================
if (tb->cflags & CF_LAST_IO)
gen_io_end();
if (env->singlestep_enabled) {
tcg_gen_movi_i32(cpu_pc, ctx.pc);
gen_helper_debug();
} else {
==========================
^ permalink raw reply [flat|nested] 4+ messages in thread* [Qemu-devel] [Bug 597362] Re: qemu-system-sparc singlestep not work in gdbstub
2010-06-22 17:31 [Qemu-devel] [Bug 597362] [NEW] qemu-system-sparc singlestep not work in gdbstub Vitaliy
@ 2017-01-10 8:57 ` Thomas Huth
2017-03-12 4:17 ` Launchpad Bug Tracker
2017-03-12 11:03 ` Mark Cave-Ayland
2 siblings, 0 replies; 4+ messages in thread
From: Thomas Huth @ 2017-01-10 8:57 UTC (permalink / raw)
To: qemu-devel
Triaging old bug reports ... Can you still reproduce this problem with
the latest version of QEMU?
** Changed in: qemu
Status: New => Incomplete
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/597362
Title:
qemu-system-sparc singlestep not work in gdbstub
Status in QEMU:
Incomplete
Bug description:
Debugging with gdb-stub does not work with qemu-system-sparc target
Qemu compiled from current git tree.
execution string: qemu-system-sparc.exe -s -S -m 256 -L Bios -hda
sparc.img -boot c
connect with telnet localhost 1234
enter '$s#73' (without quotes, this is single step command to gdb stub)
gdb stub reply '+' (without quotes, as it accept command)
After this qemu continuously execute instructions in single step mode
and does not exit to gdb stub after each executed instruction with
interrupt signal
("T%02xthread:%02x;" /gdb_vm_state_change in gdbstub.c/ );
If we look at target-sparc/translate.c, we can see that
gen_helper_debug() is not called in single step mode:
========================
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
(npc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
!s->singlestep) {
/* jump to same page: we can use a direct jump */
tcg_gen_goto_tb(tb_num);
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb((long)tb + tb_num);
} else {
/* jump to another page: currently not optimized */
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb(0);
}
=========================
========================
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->singlestep) {
break;
}
========================
If we look similar code at target-sh4/translate.c we can see that is
called in this cases:
========================
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
!ctx->singlestep_enabled) {
/* Use a direct jump if in same page and singlestep not enabled */
tcg_gen_goto_tb(n);
tcg_gen_movi_i32(cpu_pc, dest);
tcg_gen_exit_tb((long) tb + n);
} else {
tcg_gen_movi_i32(cpu_pc, dest);
if (ctx->singlestep_enabled)
gen_helper_debug();
tcg_gen_exit_tb(0);
}
========================
========================
if (tb->cflags & CF_LAST_IO)
gen_io_end();
if (env->singlestep_enabled) {
tcg_gen_movi_i32(cpu_pc, ctx.pc);
gen_helper_debug();
} else {
==========================
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/597362/+subscriptions
^ permalink raw reply [flat|nested] 4+ messages in thread* [Qemu-devel] [Bug 597362] Re: qemu-system-sparc singlestep not work in gdbstub
2010-06-22 17:31 [Qemu-devel] [Bug 597362] [NEW] qemu-system-sparc singlestep not work in gdbstub Vitaliy
2017-01-10 8:57 ` [Qemu-devel] [Bug 597362] " Thomas Huth
@ 2017-03-12 4:17 ` Launchpad Bug Tracker
2017-03-12 11:03 ` Mark Cave-Ayland
2 siblings, 0 replies; 4+ messages in thread
From: Launchpad Bug Tracker @ 2017-03-12 4:17 UTC (permalink / raw)
To: qemu-devel
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/597362
Title:
qemu-system-sparc singlestep not work in gdbstub
Status in QEMU:
Expired
Bug description:
Debugging with gdb-stub does not work with qemu-system-sparc target
Qemu compiled from current git tree.
execution string: qemu-system-sparc.exe -s -S -m 256 -L Bios -hda
sparc.img -boot c
connect with telnet localhost 1234
enter '$s#73' (without quotes, this is single step command to gdb stub)
gdb stub reply '+' (without quotes, as it accept command)
After this qemu continuously execute instructions in single step mode
and does not exit to gdb stub after each executed instruction with
interrupt signal
("T%02xthread:%02x;" /gdb_vm_state_change in gdbstub.c/ );
If we look at target-sparc/translate.c, we can see that
gen_helper_debug() is not called in single step mode:
========================
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
(npc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
!s->singlestep) {
/* jump to same page: we can use a direct jump */
tcg_gen_goto_tb(tb_num);
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb((long)tb + tb_num);
} else {
/* jump to another page: currently not optimized */
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb(0);
}
=========================
========================
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->singlestep) {
break;
}
========================
If we look similar code at target-sh4/translate.c we can see that is
called in this cases:
========================
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
!ctx->singlestep_enabled) {
/* Use a direct jump if in same page and singlestep not enabled */
tcg_gen_goto_tb(n);
tcg_gen_movi_i32(cpu_pc, dest);
tcg_gen_exit_tb((long) tb + n);
} else {
tcg_gen_movi_i32(cpu_pc, dest);
if (ctx->singlestep_enabled)
gen_helper_debug();
tcg_gen_exit_tb(0);
}
========================
========================
if (tb->cflags & CF_LAST_IO)
gen_io_end();
if (env->singlestep_enabled) {
tcg_gen_movi_i32(cpu_pc, ctx.pc);
gen_helper_debug();
} else {
==========================
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/597362/+subscriptions
^ permalink raw reply [flat|nested] 4+ messages in thread* [Qemu-devel] [Bug 597362] Re: qemu-system-sparc singlestep not work in gdbstub
2010-06-22 17:31 [Qemu-devel] [Bug 597362] [NEW] qemu-system-sparc singlestep not work in gdbstub Vitaliy
2017-01-10 8:57 ` [Qemu-devel] [Bug 597362] " Thomas Huth
2017-03-12 4:17 ` Launchpad Bug Tracker
@ 2017-03-12 11:03 ` Mark Cave-Ayland
2 siblings, 0 replies; 4+ messages in thread
From: Mark Cave-Ayland @ 2017-03-12 11:03 UTC (permalink / raw)
To: qemu-devel
I'm sure this has been fixed years ago (and qemu-system-sparc single-
step seems fine in local tests) so I'm marking this as "Fix released".
** Changed in: qemu
Status: Expired => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/597362
Title:
qemu-system-sparc singlestep not work in gdbstub
Status in QEMU:
Fix Released
Bug description:
Debugging with gdb-stub does not work with qemu-system-sparc target
Qemu compiled from current git tree.
execution string: qemu-system-sparc.exe -s -S -m 256 -L Bios -hda
sparc.img -boot c
connect with telnet localhost 1234
enter '$s#73' (without quotes, this is single step command to gdb stub)
gdb stub reply '+' (without quotes, as it accept command)
After this qemu continuously execute instructions in single step mode
and does not exit to gdb stub after each executed instruction with
interrupt signal
("T%02xthread:%02x;" /gdb_vm_state_change in gdbstub.c/ );
If we look at target-sparc/translate.c, we can see that
gen_helper_debug() is not called in single step mode:
========================
if ((pc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
(npc & TARGET_PAGE_MASK) == (tb->pc & TARGET_PAGE_MASK) &&
!s->singlestep) {
/* jump to same page: we can use a direct jump */
tcg_gen_goto_tb(tb_num);
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb((long)tb + tb_num);
} else {
/* jump to another page: currently not optimized */
tcg_gen_movi_tl(cpu_pc, pc);
tcg_gen_movi_tl(cpu_npc, npc);
tcg_gen_exit_tb(0);
}
=========================
========================
/* if single step mode, we generate only one instruction and
generate an exception */
if (dc->singlestep) {
break;
}
========================
If we look similar code at target-sh4/translate.c we can see that is
called in this cases:
========================
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
!ctx->singlestep_enabled) {
/* Use a direct jump if in same page and singlestep not enabled */
tcg_gen_goto_tb(n);
tcg_gen_movi_i32(cpu_pc, dest);
tcg_gen_exit_tb((long) tb + n);
} else {
tcg_gen_movi_i32(cpu_pc, dest);
if (ctx->singlestep_enabled)
gen_helper_debug();
tcg_gen_exit_tb(0);
}
========================
========================
if (tb->cflags & CF_LAST_IO)
gen_io_end();
if (env->singlestep_enabled) {
tcg_gen_movi_i32(cpu_pc, ctx.pc);
gen_helper_debug();
} else {
==========================
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/597362/+subscriptions
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-03-12 11:16 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-06-22 17:31 [Qemu-devel] [Bug 597362] [NEW] qemu-system-sparc singlestep not work in gdbstub Vitaliy
2017-01-10 8:57 ` [Qemu-devel] [Bug 597362] " Thomas Huth
2017-03-12 4:17 ` Launchpad Bug Tracker
2017-03-12 11:03 ` Mark Cave-Ayland
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