From e17666ba48f78ff10162d7448e7c92d668d8faf6 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 4 Jun 2007 15:15:43 +1000 Subject: [POWERPC] ptrace updates & new, better requests The powerpc ptrace interface is dodgy at best. We have defined our "own" versions of GETREGS/SETREGS/GETFPREGS/SETFPREGS that strangely take arguments in reverse order from other archs (in addition to having different request numbers) and have subtle issue, like not accessing all of the registers in their respective categories. This patch moves the implementation of those to a separate function in order to facilitate their deprecation in the future, and provides new ptrace requests that mirror the x86 and sparc ones and use the same numbers: PTRACE_GETREGS : returns an entire pt_regs (the whole thing, not only the 32 GPRs, though that doesn't include the FPRs etc... There's a compat version for 32 bits that returns a 32 bits compatible pt_regs (44 uints) PTRACE_SETREGS : sets an entire pt_regs (the whole thing, not only the 32 GPRs, though that doesn't include the FPRs etc... Some registers cannot be written to and will just be dropped, this is the same as with POKEUSR, that is anything above MQ on 32 bits and CCR on 64 bits. There is a compat version as well. PTRACE_GETFPREGS : returns all the FP registers -including- the FPSCR that is 33 doubles (regardless of 32/64 bits) PTRACE_SETFPREGS : sets all the FP registers -including- the FPSCR that is 33 doubles (regardless of 32/64 bits) And two that only exist on 64 bits kernels: PTRACE_GETREGS64 : Same as PTRACE_GETREGS, except there is no compat function, a 32 bits process will obtain the full 64 bits registers PTRACE_SETREGS64 : Same as PTRACE_SETREGS, except there is no compat function, a 32 bits process will set the full 64 bits registers The two later ones makes things easier to have a 32 bits debugger on a 64 bits program (or on a 32 bits program that uses the full 64 bits of the GPRs, which is possible though has issues that will be fixed in a later patch). Finally, while at it, the patch removes a whole bunch of code duplication between ptrace32.c and ptrace.c, in large part by having the former call into the later for all requests that don't need any special "compat" treatment. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- include/asm-powerpc/ptrace.h | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'include/asm-powerpc/ptrace.h') diff --git a/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h index 4ad77a13f86..53d24584e96 100644 --- a/include/asm-powerpc/ptrace.h +++ b/include/asm-powerpc/ptrace.h @@ -158,9 +158,7 @@ do { \ #define PT_NIP 32 #define PT_MSR 33 -#ifdef __KERNEL__ #define PT_ORIG_R3 34 -#endif #define PT_CTR 35 #define PT_LNK 36 #define PT_XER 37 @@ -169,11 +167,12 @@ do { \ #define PT_MQ 39 #else #define PT_SOFTE 39 +#endif #define PT_TRAP 40 #define PT_DAR 41 #define PT_DSISR 42 #define PT_RESULT 43 -#endif +#define PT_REGS_COUNT 44 #define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */ @@ -229,7 +228,17 @@ do { \ #define PTRACE_GET_DEBUGREG 25 #define PTRACE_SET_DEBUGREG 26 -/* Additional PTRACE requests implemented on PowerPC. */ +/* (new) PTRACE requests using the same numbers as x86 and the same + * argument ordering. Additionally, they support more registers too + */ +#define PTRACE_GETREGS 12 +#define PTRACE_SETREGS 13 +#define PTRACE_GETFPREGS 14 +#define PTRACE_SETFPREGS 15 +#define PTRACE_GETREGS64 22 +#define PTRACE_SETREGS64 23 + +/* (old) PTRACE requests with inverted arguments */ #define PPC_PTRACE_GETREGS 0x99 /* Get GPRs 0 - 31 */ #define PPC_PTRACE_SETREGS 0x98 /* Set GPRs 0 - 31 */ #define PPC_PTRACE_GETFPREGS 0x97 /* Get FPRs 0 - 31 */ -- cgit v1.2.3-18-g5258 From 865418d8e78b9c11c964157740b2596d6ffe9dfa Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 4 Jun 2007 15:15:44 +1000 Subject: [POWERPC] Uninline common ptrace bits This folds back the ptrace-common.h bits back into ptrace.c and removes that file. The FSL SPE bits from ptrace-ppc32.h are folded back in as well. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- include/asm-powerpc/ptrace.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/asm-powerpc/ptrace.h') diff --git a/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h index 53d24584e96..13fccc5a411 100644 --- a/include/asm-powerpc/ptrace.h +++ b/include/asm-powerpc/ptrace.h @@ -92,6 +92,11 @@ extern unsigned long profile_pc(struct pt_regs *regs); set_thread_flag(TIF_NOERROR); \ } while(0) +struct task_struct; +extern unsigned long ptrace_get_reg(struct task_struct *task, int regno); +extern int ptrace_put_reg(struct task_struct *task, int regno, + unsigned long data); + /* * We use the least-significant bit of the trap field to indicate * whether we have saved the full set of registers, or only a -- cgit v1.2.3-18-g5258