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author | Bodo Stroesser <bstroesser@fujitsu-siemens.com> | 2005-05-07 04:30:46 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-07 05:09:29 (GMT) |
commit | 82c1c11bdd92d94f8fd620a3ea6c894eba37d4ed (patch) | |
tree | bc2ac7e025e250678261695a19e171f2991746c6 /arch/um/sys-i386 | |
parent | 16c11163019879c0e1e69d3ec7d4574a80e9c77e (diff) | |
download | linux-fsl-qoriq-82c1c11bdd92d94f8fd620a3ea6c894eba37d4ed.tar.xz |
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/sys-i386')
-rw-r--r-- | arch/um/sys-i386/ptrace.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c index e470d28..e839ce6 100644 --- a/arch/um/sys-i386/ptrace.c +++ b/arch/um/sys-i386/ptrace.c @@ -73,6 +73,25 @@ int putreg(struct task_struct *child, int regno, unsigned long value) return 0; } +int poke_user(struct task_struct *child, long addr, long data) +{ + if ((addr & 3) || addr < 0) + return -EIO; + + if (addr < MAX_REG_OFFSET) + return putreg(child, addr, data); + + else if((addr >= offsetof(struct user, u_debugreg[0])) && + (addr <= offsetof(struct user, u_debugreg[7]))){ + addr -= offsetof(struct user, u_debugreg[0]); + addr = addr >> 2; + if((addr == 4) || (addr == 5)) return -EIO; + child->thread.arch.debugregs[addr] = data; + return 0; + } + return -EIO; +} + unsigned long getreg(struct task_struct *child, int regno) { unsigned long retval = ~0UL; @@ -93,6 +112,27 @@ unsigned long getreg(struct task_struct *child, int regno) return retval; } +int peek_user(struct task_struct *child, long addr, long data) +{ +/* read the word at location addr in the USER area. */ + unsigned long tmp; + + if ((addr & 3) || addr < 0) + return -EIO; + + tmp = 0; /* Default return condition */ + if(addr < MAX_REG_OFFSET){ + tmp = getreg(child, addr); + } + else if((addr >= offsetof(struct user, u_debugreg[0])) && + (addr <= offsetof(struct user, u_debugreg[7]))){ + addr -= offsetof(struct user, u_debugreg[0]); + addr = addr >> 2; + tmp = child->thread.arch.debugregs[addr]; + } + return put_user(tmp, (unsigned long *) data); +} + struct i387_fxsave_struct { unsigned short cwd; unsigned short swd; |