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the kernel. They are not used atm, but having them in trunk allows them to be easily used when needed. To set a breakpoint that triggers when the variable foo is written to (the most common use case), one calls: breakpoint_set(vir2phys((vir_bytes) &foo), 0, BREAKPOINT_FLAG_MODE_GLOBAL | BREAKPOINT_FLAG_RW_WRITE | BREAKPOINT_FLAG_LEN_4); It can later be disabled using: breakpoint_set(vir2phys((vir_bytes) &foo), 0, BREAKPOINT_FLAG_MODE_OFF); There are some limitations: - There are at most four breakpoints (hardware limit); the index of the breakpoint (0-3) is specified as the second parameter of breakpoint_set. - The breakpoint exception in the kernel is not handled and causes a panic; it would be reasonably easy to change this by inspecing DR6, printing a message, disabling the breakpoint and continuing. However, in my experience even just a panic can be very useful. - Breakpoints can be set only in the part of the address space that is in every page table. It is useful for the kernel, but to use this for user processes would require saving and restoring the debug registers as part of the context switch. Although the CPU provides support for local breakpoints (I implemened this as BREAKPOINT_FLAG_LOCAL) they only work if task switching is used.
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
20060818:
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You need flex in your $PATH, which has become part of the base
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system. This needs bigger binaries.
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If you don't have flex yet, you can compile it first by doing:
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# cp /usr/src/etc/binary_sizes* /etc
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# binsizes big
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# cd /usr/src/commands/flex-2.5.4
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# sh build
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20061222:
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Install binaries in the right order because the new readdir
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implementation and the new mount program are incompatible
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with older kernels and the new kernels require the new mount.
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# cd /usr/src
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# make includes
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# make libraries
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# make cmds
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# make depend
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# cd /usr/src/tools
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# make hdboot
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# make install
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# cd ..
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# make install
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Installing fails for boot. Reboot the system
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# reboot -x 'unset image; boot'
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Now install everything
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# cd /usr/src
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# make install
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20061222:
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The archictecture-dependent/-independent split needs ARCH=<arch>
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in /etc/make.conf, included by some Makefiles and sourced by
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some shell scripts. To install it, type 'make install' in
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src/etc, or simply copy the file over.
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20070118:
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drivers.conf has been updated to include an ACL for mfs. it has
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to be installed before rebooting after an update of the mount command.
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20070212 (r2751):
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mkfs needs more memory to make an image; chmem it or do
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# touch mkfs.c ; make /usr/bin/mkfs
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in /usr/src/commands/simple.
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20091006 (r5422):
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OSS requires an improved make to be compiled; run "make install"
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in /usr/src/commands/make before running "make world".
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20091212:
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/etc/drivers.conf has been renamed to /etc/system.conf.
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user "service" has been added to password file /etc/passwd.
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20100215:
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Make(1) has been replaced: Run 'make install' in commands/make
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Mkdep updates: Copy commands/scripts/mkdep.sh to /usr/bin/mkdep
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Make(1) needs mkfiles: Copy files in etc/mk to /etc/mk
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ACK update: Copy commands/i386/acd.descr to /usr/lib/descr
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End.a renamed:
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-Copy /usr/lib/i86/end.a to /usr/lib/i86/libend.a
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-Copy /usr/lib/i386/end.a to /usr/lib/i386/libend.a
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-Copy /usr/gnu/lib/end.a to /usr/gnu/lib/libend.a
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Asmconv updates: Run 'make install' in commands/i386/asmconv
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20100303:
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Gas2ack updates: Run 'make install' in commands/i386/gas2ack
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20100308:
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Include directory reorganization:
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# mv /usr/include/ibm /usr/include/i386
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# ln -s /usr/include/arch/i386 /usr/include/machine
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Install(1) updates:
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# cd commands/simple && make /bin/install
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20100316:
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/usr/man/man9 is required
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# mkdir /usr/man/man9
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20100317:
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/usr/src/etc/system.conf updated to ignore default kernel calls: copy
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it (or merge it) to /etc/system.conf.
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The hello driver (/dev/hello) added to the distribution:
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# cd /usr/src/commands/scripts && make clean install
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# cd /dev && MAKEDEV hello
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20100318:
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Gas2ack updates: Run 'make install' in commands/i386/gas2ack
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