The save_ptregs() function has not been tested or even built. I will need help to complete this. Signed-off-by: David VomLehn <dvomlehn@xxxxxxxxx> --- arch/alpha/include/asm/ptrace.h | 124 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 124 insertions(+), 0 deletions(-) diff --git a/arch/alpha/include/asm/ptrace.h b/arch/alpha/include/asm/ptrace.h index 65cf3e2..952d177 100644 --- a/arch/alpha/include/asm/ptrace.h +++ b/arch/alpha/include/asm/ptrace.h @@ -79,6 +79,130 @@ extern void show_regs(struct pt_regs *); #define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0) +/* Macros for saving the contents of registers and for the output constraint + * for those registers */ +#include "/home/vomlehn/git/kernel.org/linux/ptreg.h" +#define PTREG_SAVE(r, name) "stq " #r ", %[" #name "]\n" +#define PTREG_SAVE_R(i) PTREG_SAVE_I($, r, i) + +#define PTREG_OUT_R(regsp, i) PTREG_OUT_I(regsp, r, r, i) + +#define arch_has_save_ptregs 1 + +/** + * save_ptregs - save processor registers for backtracing + * @regs: Pointer to &struct pt_regs structure in which to save the + * registers + * + * Returns a constant pointer to @regs. + * + * This function must be called first in a function. There must be no + * auto variables defined that are initialized before calling this function. + */ +static __always_inline +const struct pt_regs *save_ptregs(struct pt_regs *regs) +{ + __asm__ __volatile__ ( + /* Based on the SAVE_ALL code */ + PTREG_SAVE_R(0) + PTREG_SAVE_R(1) + PTREG_SAVE_R(2) + PTREG_SAVE_R(3) + PTREG_SAVE_R(4) + PTREG_SAVE_R(28) + "lda $2, alpha_mv\n" + PTREG_SAVE_R(5) + PTREG_SAVE_R(6) + PTREG_SAVE_R(7) + PTREG_SAVE_R(8) + PTREG_SAVE_R(19) + PTREG_SAVE_R(20) + PTREG_SAVE_R(21) + "ldq $2, HAE_CACHE($2)\n" + PTREG_SAVE_R(22) + PTREG_SAVE_R(23) + PTREG_SAVE_R(24) + PTREG_SAVE_R(25) + PTREG_SAVE_R(26) + PTREG_SAVE_R(27) + PTREG_SAVE($2, hae) + PTREG_SAVE_R(16) + PTREG_SAVE_R(17) + PTREG_SAVE_R(18) + + PTREG_SAVE_R(9) + PTREG_SAVE_R(10) + PTREG_SAVE_R(11) + PTREG_SAVE_R(12) + PTREG_SAVE_R(13) + PTREG_SAVE_R(14) + PTREG_SAVE_R(15) + PTREG_SAVE_R(29) + PTREG_SAVE_R(30) + PTREG_SAVE_R(31) + PTREG_SAVE_REG($gp, gp) + PTREG_SAVE_REG($31, ps) + + /* These are almost certainly wrong */ + PTREG_SAVE_REG(trap_a0, trap_a0) + PTREG_SAVE_REG(trap_a1, trap_a1) + PTREG_SAVE_REG(trap_a2, trap_a2) + /* + * The current location is the one for which the register + * values are correct, even if some had been modified on + * function entry. So, the current location is the value to + * save as the execution address. + */ + "1b:\n" + "lda $2, 1b\n" + PTREG_SAVE($2, pc) + : + PTREG_OUT_R(regs, 0), + PTREG_OUT_R(regs, 1), + PTREG_OUT_R(regs, 2), + PTREG_OUT_R(regs, 3), + PTREG_OUT_R(regs, 4), + PTREG_OUT_R(regs, 5), + PTREG_OUT_R(regs, 6), + PTREG_OUT_R(regs, 7), + PTREG_OUT_R(regs, 8), + PTREG_OUT_R(regs, 9), + PTREG_OUT_R(regs, 10), + PTREG_OUT_R(regs, 11), + PTREG_OUT_R(regs, 12), + PTREG_OUT_R(regs, 13), + PTREG_OUT_R(regs, 14), + PTREG_OUT_R(regs, 15), + PTREG_OUT_R(regs, 16), + PTREG_OUT_R(regs, 17), + PTREG_OUT_R(regs, 18), + PTREG_OUT_R(regs, 19), + PTREG_OUT_R(regs, 20), + PTREG_OUT_R(regs, 21), + PTREG_OUT_R(regs, 22), + PTREG_OUT_R(regs, 23), + PTREG_OUT_R(regs, 24), + PTREG_OUT_R(regs, 25), + PTREG_OUT_R(regs, 26), + PTREG_OUT_R(regs, 27), + PTREG_OUT_R(regs, 28), + PTREG_OUT_R(regs, 29), + PTREG_OUT_R(regs, 30), + PTREG_OUT_R(regs, 31), + + PTREG_OUT(regs, hae, hae), + PTREG_OUT(regs, trap_a0, trap_a0), + PTREG_OUT(regs, trap_a1, trap_a1), + PTREG_OUT(regs, trap_a2, trap_a2), + PTREG_OUT(regs, ps, ps), + PTREG_OUT(regs, pc, pc), + PTREG_OUT(regs, gp, gp) + : + "$2" + ); + + return regs; +} #endif #endif -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html