From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/mips/kernel/ptrace32.c | 317 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 317 insertions(+) create mode 100644 arch/mips/kernel/ptrace32.c (limited to 'arch/mips/kernel/ptrace32.c') diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c new file mode 100644 index 000000000..afcf27a87 --- /dev/null +++ b/arch/mips/kernel/ptrace32.c @@ -0,0 +1,317 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1992 Ross Biro + * Copyright (C) Linus Torvalds + * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle + * Copyright (C) 1996 David S. Miller + * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com + * Copyright (C) 1999 MIPS Technologies, Inc. + * Copyright (C) 2000 Ulf Carlsson + * + * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit + * binaries. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Tracing a 32-bit process with a 64-bit strace and vice versa will not + * work. I don't know how to fix this. + */ +long compat_arch_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t caddr, compat_ulong_t cdata) +{ + int addr = caddr; + int data = cdata; + int ret; + + switch (request) { + + /* + * Read 4 bytes of the other process' storage + * data is a pointer specifying where the user wants the + * 4 bytes copied into + * addr is a pointer in the user's storage that contains an 8 byte + * address in the other process of the 4 bytes that is to be read + * (this is run in a 32-bit process looking at a 64-bit process) + * when I and D space are separate, these will need to be fixed. + */ + case PTRACE_PEEKTEXT_3264: + case PTRACE_PEEKDATA_3264: { + u32 tmp; + int copied; + u32 __user * addrOthers; + + ret = -EIO; + + /* Get the addr in the other process that we want to read */ + if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) + break; + + copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, + sizeof(tmp), FOLL_FORCE); + if (copied != sizeof(tmp)) + break; + ret = put_user(tmp, (u32 __user *) (unsigned long) data); + break; + } + + /* Read the word at location addr in the USER area. */ + case PTRACE_PEEKUSR: { + struct pt_regs *regs; + unsigned int tmp; + + regs = task_pt_regs(child); + ret = 0; /* Default return value. */ + + switch (addr) { + case 0 ... 31: + tmp = regs->regs[addr]; + break; +#ifdef CONFIG_MIPS_FP_SUPPORT + case FPR_BASE ... FPR_BASE + 31: { + union fpureg *fregs; + + if (!tsk_used_math(child)) { + /* FP not yet used */ + tmp = -1; + break; + } + fregs = get_fpu_regs(child); + if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { + /* + * The odd registers are actually the high + * order bits of the values stored in the even + * registers. + */ + tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], + addr & 1); + break; + } + tmp = get_fpr64(&fregs[addr - FPR_BASE], 0); + break; + } + case FPC_CSR: + tmp = child->thread.fpu.fcr31; + break; + case FPC_EIR: + /* implementation / version register */ + tmp = boot_cpu_data.fpu_id; + break; +#endif /* CONFIG_MIPS_FP_SUPPORT */ + case PC: + tmp = regs->cp0_epc; + break; + case CAUSE: + tmp = regs->cp0_cause; + break; + case BADVADDR: + tmp = regs->cp0_badvaddr; + break; + case MMHI: + tmp = regs->hi; + break; + case MMLO: + tmp = regs->lo; + break; + case DSP_BASE ... DSP_BASE + 5: { + dspreg_t *dregs; + + if (!cpu_has_dsp) { + tmp = 0; + ret = -EIO; + goto out; + } + dregs = __get_dsp_regs(child); + tmp = dregs[addr - DSP_BASE]; + break; + } + case DSP_CONTROL: + if (!cpu_has_dsp) { + tmp = 0; + ret = -EIO; + goto out; + } + tmp = child->thread.dsp.dspcontrol; + break; + default: + tmp = 0; + ret = -EIO; + goto out; + } + ret = put_user(tmp, (unsigned __user *) (unsigned long) data); + break; + } + + /* + * Write 4 bytes into the other process' storage + * data is the 4 bytes that the user wants written + * addr is a pointer in the user's storage that contains an + * 8 byte address in the other process where the 4 bytes + * that is to be written + * (this is run in a 32-bit process looking at a 64-bit process) + * when I and D space are separate, these will need to be fixed. + */ + case PTRACE_POKETEXT_3264: + case PTRACE_POKEDATA_3264: { + u32 __user * addrOthers; + + /* Get the addr in the other process that we want to write into */ + ret = -EIO; + if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) + break; + ret = 0; + if (ptrace_access_vm(child, (u64)addrOthers, &data, + sizeof(data), + FOLL_FORCE | FOLL_WRITE) == sizeof(data)) + break; + ret = -EIO; + break; + } + + case PTRACE_POKEUSR: { + struct pt_regs *regs; + ret = 0; + regs = task_pt_regs(child); + + switch (addr) { + case 0 ... 31: + regs->regs[addr] = data; + /* System call number may have been changed */ + if (addr == 2) + mips_syscall_update_nr(child, regs); + else if (addr == 4 && + mips_syscall_is_indirect(child, regs)) + mips_syscall_update_nr(child, regs); + break; +#ifdef CONFIG_MIPS_FP_SUPPORT + case FPR_BASE ... FPR_BASE + 31: { + union fpureg *fregs = get_fpu_regs(child); + + if (!tsk_used_math(child)) { + /* FP not yet used */ + memset(&child->thread.fpu, ~0, + sizeof(child->thread.fpu)); + child->thread.fpu.fcr31 = 0; + } + if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { + /* + * The odd registers are actually the high + * order bits of the values stored in the even + * registers. + */ + set_fpr32(&fregs[(addr & ~1) - FPR_BASE], + addr & 1, data); + break; + } + set_fpr64(&fregs[addr - FPR_BASE], 0, data); + break; + } + case FPC_CSR: + child->thread.fpu.fcr31 = data; + break; +#endif /* CONFIG_MIPS_FP_SUPPORT */ + case PC: + regs->cp0_epc = data; + break; + case MMHI: + regs->hi = data; + break; + case MMLO: + regs->lo = data; + break; + case DSP_BASE ... DSP_BASE + 5: { + dspreg_t *dregs; + + if (!cpu_has_dsp) { + ret = -EIO; + break; + } + + dregs = __get_dsp_regs(child); + dregs[addr - DSP_BASE] = data; + break; + } + case DSP_CONTROL: + if (!cpu_has_dsp) { + ret = -EIO; + break; + } + child->thread.dsp.dspcontrol = data; + break; + default: + /* The rest are not allowed. */ + ret = -EIO; + break; + } + break; + } + + case PTRACE_GETREGS: + ret = ptrace_getregs(child, + (struct user_pt_regs __user *) (__u64) data); + break; + + case PTRACE_SETREGS: + ret = ptrace_setregs(child, + (struct user_pt_regs __user *) (__u64) data); + break; + +#ifdef CONFIG_MIPS_FP_SUPPORT + case PTRACE_GETFPREGS: + ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data); + break; + + case PTRACE_SETFPREGS: + ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data); + break; +#endif + case PTRACE_GET_THREAD_AREA: + ret = put_user(task_thread_info(child)->tp_value, + (unsigned int __user *) (unsigned long) data); + break; + + case PTRACE_GET_THREAD_AREA_3264: + ret = put_user(task_thread_info(child)->tp_value, + (unsigned long __user *) (unsigned long) data); + break; + + case PTRACE_GET_WATCH_REGS: + ret = ptrace_get_watch_regs(child, + (struct pt_watch_regs __user *) (unsigned long) addr); + break; + + case PTRACE_SET_WATCH_REGS: + ret = ptrace_set_watch_regs(child, + (struct pt_watch_regs __user *) (unsigned long) addr); + break; + + default: + ret = compat_ptrace_request(child, request, addr, data); + break; + } +out: + return ret; +} -- cgit v1.2.3