This test aims at catching API misbehaviour w.r.t. the interaction
between interrupts and memory accesses, such as the bug fixed in
27f347e6a1d269c533633c812321cabb249eada8
Because the condition for triggering misbehaviour may not be
deterministic and the cross-section between memory accesses and
interrupt handlers may be small, we have to place our trust in large
numbers. Instead of guessing/trying an arbitrary, fixed loop-bound, we
decided to loop for a fixed amount of real-time. This avoids the test
running into a time-out on slower machines while enabling a high number
of possible interactions on faster machines.
Reviewed-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Signed-off-by: Julian Ganz <neither@nut.email>
---
tests/tcg/riscv64/Makefile.softmmu-target | 6 ++
tests/tcg/riscv64/interruptedmemory.S | 67 +++++++++++++++++++++++
2 files changed, 73 insertions(+)
create mode 100644 tests/tcg/riscv64/interruptedmemory.S
diff --git a/tests/tcg/riscv64/Makefile.softmmu-target
b/tests/tcg/riscv64/Makefile.softmmu-target
index 5fba973e18..5d07755964 100644
--- a/tests/tcg/riscv64/Makefile.softmmu-target
+++ b/tests/tcg/riscv64/Makefile.softmmu-target
@@ -26,5 +26,11 @@ run-plugin-doubletrap: doubletrap
$(QEMU) -plugin ../plugins/libdiscons.so -d plugin -D $*.pout \
$(QEMU_OPTS)$<)
+EXTRA_RUNS += run-plugin-interruptedmemory
+run-plugin-interruptedmemory: interruptedmemory
+ $(call run-test, $<, \
+ $(QEMU) -plugin ../plugins/libdiscons.so -d plugin -D $*.pout \
+ $(QEMU_OPTS)$<)
+
# We don't currently support the multiarch system tests
undefine MULTIARCH_TESTS
diff --git a/tests/tcg/riscv64/interruptedmemory.S
b/tests/tcg/riscv64/interruptedmemory.S
new file mode 100644
index 0000000000..a32d672849
--- /dev/null
+++ b/tests/tcg/riscv64/interruptedmemory.S
@@ -0,0 +1,67 @@
+ .option norvc
+
+ .text
+ .global _start
+_start:
+ # Set up trap vector
+ lla t0, trap
+ csrw mtvec, t0
+
+ # Set up timer
+ lui t1, 0x02004
+ sd zero, 0(t1) # MTIMECMP0
+
+ # Enable timer interrupts
+ li t0, 0x80
+ csrrs zero, mie, t0
+ csrrsi zero, mstatus, 0x8
+
+ # Find out when to stop
+ call rtc_get
+ li t0, 60
+ slli t0, t0, 30 # Approx. 10e9 ns
+ add t0, t0, a0
+
+ # Loop with memory accesses
+ la t1, semiargs
+0:
+ ld t2, 0(t1)
+ sd t2, 0(t1)
+ call rtc_get
+ bltu a0, t0, 0b
+
+ li a0, 0
+ lla a1, semiargs
+ li t0, 0x20026 # ADP_Stopped_ApplicationExit
+ sd t0, 0(a1)
+ sd a0, 8(a1)
+ li a0, 0x20 # TARGET_SYS_EXIT_EXTENDED
+
+ # Semihosting call sequence
+ .balign 16
+ slli zero, zero, 0x1f
+ ebreak
+ srai zero, zero, 0x7
+ j .
+
+rtc_get:
+ # Get current time from the goldfish RTC
+ lui t3, 0x0101
+ lw a0, 0(t3)
+ lw t3, 4(t3)
+ slli t3, t3, 32
+ add a0, a0, t3
+ ret
+
+trap:
+ lui t5, 0x0200c
+ ld t6, -0x8(t5) # MTIME
+ addi t6, t6, 100
+ lui t5, 0x02004
+ sd t6, 0(t5) # MTIMECMP
+ mret
+
+ .data
+ .balign 16
+semiargs:
+ .space 16
--
2.49.0
