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authorChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
commit3e4c5a6261770bced301b5e74233e7866166ea5b (patch)
tree9379fddaba693ef8a045da06efee8529baa5f6f4 /gitlab/issues_text/target_missing/host_missing/accel_missing/2971
parente5634e2806195bee44407853c4bf8776f7abfa4f (diff)
downloadqemu-analysis-3e4c5a6261770bced301b5e74233e7866166ea5b.tar.gz
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clean up repository
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-loongarch64 crashes caused by lenient instruction decoding of vldi and xvldi
-Description of problem:
-Lenient instruction decoding of `vldi` and `xvldi` leads to Qemu crashes.
-
-The decoding of `vldi` and `xvldi` instruction allows for instructions with illegal immediates.
-
-`target/loongarch/insns.decode`:
-
-```
-vldi             0111 00111110 00 ............. .....     @v_i13
-xvldi            0111 01111110 00 ............. .....     @v_i13
-```
-
-This is considered in `target/loongarch/tcg/insn_trans/trans_vec.c.inc`:
-
-```C
-    /*
-     * imm bit [11:8] is mode, mode value is 0-12.
-     * other values are invalid.
-     */
-```
-
-However, an assertion error is raised when this condition is violated and qemu crashes:
-
-```
-**
-ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached
-Bail out! ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached
-```
-
-On hardware (Loongson 3A5000), these instructions cause a SIGILL.
-Steps to reproduce:
-1. compile the `test_inv_vldi` test program for loongarch64 (see additional information)
-2. run `qemu-loongarch64-static ./test_inv_vldi`
-Additional information:
-I will post a patch for this issue to the mailing list soon.
-
-`test_inv_vldi` source code:
-
-```C
-int main(int argc, char** argv) {
-    asm volatile(".4byte 0x73e3a000");    
-}
-```