riscv/qemu: QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org - qemu

QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org

emulation kvm qemu virtualization

Branch: master

History

William Hooper cad529260a target/m68k: Improve CHK and CHK2; implement CMP2 Some CHK2 (Check Register Against Bounds) instructions, such as opcode 02FA, cause spurious illegal instruction exceptions, despite being valid on Motorola MC68020 and later processors and used in existing software. With this patch, QEMU: - Translates CHK2 and CMP2 (Compare Register Against Bounds) instructions [1] having any valid size or effective address. CHK2 and CMP2 use the same opcodes but differ in bit 11 of the extension word. (BITREV or BYTEREV instructions for ColdFire family processors [2], which use similar opcodes, are not captured, however.) - Implements CMP2, which "is identical to CHK2 except that it sets condition codes rather than taking an exception" [1]. - Populates the correct "logical address of the instruction following the instruction that caused the trap" [3] in the exception stack frame for CHK and CHK2 exceptions, according to the number of words in the instruction, including extension words, rather than default lengths. An existing test for CHK2 is enabled, and tests are added for CHK, CHK2, and CMP2. References: [1] Motorola M68000 Family Programmer's Reference Manual (M68000PM/AD), Rev. 1, 1992, pages 4-72 to 4-73 and 4-82 to 4-83. [2] Freescale Semiconductor, ColdFire Family Programmer's Reference Manual (CFPRM), Rev. 3, 2005, pages 4-19 and 4-26. [3] Motorola M68040 User's Manual (M68040UM/AD), 1993, page 8-8. Signed-off-by: William Hooper <wsh@wshooper.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-ID: <20251222002634.61480-1-wsh@wshooper.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>		3 months ago
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Makefile.target	tests/tcg: Remove run-test-mmap-*	2 years ago
denormal.c	fpu: Handle m68k extended precision denormals properly	3 years ago
trap.c	target/m68k: Improve CHK and CHK2; implement CMP2	3 months ago