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linux/arch/mips/kernel/asm-offsets.c
Matt Redfearn db8466c581 MIPS: IRQ Stack: Unwind IRQ stack onto task stack 
When the separate IRQ stack was introduced, stack unwinding only
proceeded as far as the top of the IRQ stack, leading to kernel
backtraces being less useful, lacking the trace of what was interrupted.

Fix this by providing a means for the kernel to unwind the IRQ stack
onto the interrupted task stack. The processor state is saved to the
kernel task stack on interrupt. The IRQ_STACK_START macro reserves an
unsigned long at the top of the IRQ stack where the interrupted task
stack pointer can be saved. After the active stack is switched to the
IRQ stack, save the interrupted tasks stack pointer to the reserved
location.

Fix the stack unwinding code to look for the frame being the top of the
IRQ stack and if so get the next frame from the saved location. The
existing test does not work with the separate stack since the ra is no
longer pointed at ret_from_{irq,exception}.

The test to stop unwinding the stack 32 bytes from the top of a stack
must be modified to allow unwinding to continue up to the location of
the saved task stack pointer when on the IRQ stack. The low / high marks
of the stack are set depending on whether the sp is on an irq stack or
not.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15788/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-03-22 11:53:57 +01:00

400 lines
13 KiB
C
Raw Blame History

/*
* asm-offsets.c: Calculate pt_regs and task_struct offsets.
*
* Copyright (C) 1996 David S. Miller
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*
* Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2000 MIPS Technologies, Inc.
*/
#include <linux/compat.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/kbuild.h>
#include <linux/suspend.h>
#include <asm/cpu-info.h>
#include <asm/pm.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/smp-cps.h>
#include <linux/kvm_host.h>
void output_ptreg_defines(void)
{
COMMENT("MIPS pt_regs offsets.");
OFFSET(PT_R0, pt_regs, regs[0]);
OFFSET(PT_R1, pt_regs, regs[1]);
OFFSET(PT_R2, pt_regs, regs[2]);
OFFSET(PT_R3, pt_regs, regs[3]);
OFFSET(PT_R4, pt_regs, regs[4]);
OFFSET(PT_R5, pt_regs, regs[5]);
OFFSET(PT_R6, pt_regs, regs[6]);
OFFSET(PT_R7, pt_regs, regs[7]);
OFFSET(PT_R8, pt_regs, regs[8]);
OFFSET(PT_R9, pt_regs, regs[9]);
OFFSET(PT_R10, pt_regs, regs[10]);
OFFSET(PT_R11, pt_regs, regs[11]);
OFFSET(PT_R12, pt_regs, regs[12]);
OFFSET(PT_R13, pt_regs, regs[13]);
OFFSET(PT_R14, pt_regs, regs[14]);
OFFSET(PT_R15, pt_regs, regs[15]);
OFFSET(PT_R16, pt_regs, regs[16]);
OFFSET(PT_R17, pt_regs, regs[17]);
OFFSET(PT_R18, pt_regs, regs[18]);
OFFSET(PT_R19, pt_regs, regs[19]);
OFFSET(PT_R20, pt_regs, regs[20]);
OFFSET(PT_R21, pt_regs, regs[21]);
OFFSET(PT_R22, pt_regs, regs[22]);
OFFSET(PT_R23, pt_regs, regs[23]);
OFFSET(PT_R24, pt_regs, regs[24]);
OFFSET(PT_R25, pt_regs, regs[25]);
OFFSET(PT_R26, pt_regs, regs[26]);
OFFSET(PT_R27, pt_regs, regs[27]);
OFFSET(PT_R28, pt_regs, regs[28]);
OFFSET(PT_R29, pt_regs, regs[29]);
OFFSET(PT_R30, pt_regs, regs[30]);
OFFSET(PT_R31, pt_regs, regs[31]);
OFFSET(PT_LO, pt_regs, lo);
OFFSET(PT_HI, pt_regs, hi);
#ifdef CONFIG_CPU_HAS_SMARTMIPS
OFFSET(PT_ACX, pt_regs, acx);
#endif
OFFSET(PT_EPC, pt_regs, cp0_epc);
OFFSET(PT_BVADDR, pt_regs, cp0_badvaddr);
OFFSET(PT_STATUS, pt_regs, cp0_status);
OFFSET(PT_CAUSE, pt_regs, cp0_cause);
#ifdef CONFIG_CPU_CAVIUM_OCTEON
OFFSET(PT_MPL, pt_regs, mpl);
OFFSET(PT_MTP, pt_regs, mtp);
#endif /* CONFIG_CPU_CAVIUM_OCTEON */
DEFINE(PT_SIZE, sizeof(struct pt_regs));
BLANK();
}
void output_task_defines(void)
{
COMMENT("MIPS task_struct offsets.");
OFFSET(TASK_STATE, task_struct, state);
OFFSET(TASK_THREAD_INFO, task_struct, stack);
OFFSET(TASK_FLAGS, task_struct, flags);
OFFSET(TASK_MM, task_struct, mm);
OFFSET(TASK_PID, task_struct, pid);
#if defined(CONFIG_CC_STACKPROTECTOR)
OFFSET(TASK_STACK_CANARY, task_struct, stack_canary);
#endif
DEFINE(TASK_STRUCT_SIZE, sizeof(struct task_struct));
BLANK();
}
void output_thread_info_defines(void)
{
COMMENT("MIPS thread_info offsets.");
OFFSET(TI_TASK, thread_info, task);
OFFSET(TI_FLAGS, thread_info, flags);
OFFSET(TI_TP_VALUE, thread_info, tp_value);
OFFSET(TI_CPU, thread_info, cpu);
OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
OFFSET(TI_ADDR_LIMIT, thread_info, addr_limit);
OFFSET(TI_REGS, thread_info, regs);
DEFINE(_THREAD_SIZE, THREAD_SIZE);
DEFINE(_THREAD_MASK, THREAD_MASK);
DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE);
DEFINE(_IRQ_STACK_START, IRQ_STACK_START);
BLANK();
}
void output_thread_defines(void)
{
COMMENT("MIPS specific thread_struct offsets.");
OFFSET(THREAD_REG16, task_struct, thread.reg16);
OFFSET(THREAD_REG17, task_struct, thread.reg17);
OFFSET(THREAD_REG18, task_struct, thread.reg18);
OFFSET(THREAD_REG19, task_struct, thread.reg19);
OFFSET(THREAD_REG20, task_struct, thread.reg20);
OFFSET(THREAD_REG21, task_struct, thread.reg21);
OFFSET(THREAD_REG22, task_struct, thread.reg22);
OFFSET(THREAD_REG23, task_struct, thread.reg23);
OFFSET(THREAD_REG29, task_struct, thread.reg29);
OFFSET(THREAD_REG30, task_struct, thread.reg30);
OFFSET(THREAD_REG31, task_struct, thread.reg31);
OFFSET(THREAD_STATUS, task_struct,
thread.cp0_status);
OFFSET(THREAD_FPU, task_struct, thread.fpu);
OFFSET(THREAD_BVADDR, task_struct, \
thread.cp0_badvaddr);
OFFSET(THREAD_BUADDR, task_struct, \
thread.cp0_baduaddr);
OFFSET(THREAD_ECODE, task_struct, \
thread.error_code);
OFFSET(THREAD_TRAPNO, task_struct, thread.trap_nr);
BLANK();
}
void output_thread_fpu_defines(void)
{
OFFSET(THREAD_FPR0, task_struct, thread.fpu.fpr[0]);
OFFSET(THREAD_FPR1, task_struct, thread.fpu.fpr[1]);
OFFSET(THREAD_FPR2, task_struct, thread.fpu.fpr[2]);
OFFSET(THREAD_FPR3, task_struct, thread.fpu.fpr[3]);
OFFSET(THREAD_FPR4, task_struct, thread.fpu.fpr[4]);
OFFSET(THREAD_FPR5, task_struct, thread.fpu.fpr[5]);
OFFSET(THREAD_FPR6, task_struct, thread.fpu.fpr[6]);
OFFSET(THREAD_FPR7, task_struct, thread.fpu.fpr[7]);
OFFSET(THREAD_FPR8, task_struct, thread.fpu.fpr[8]);
OFFSET(THREAD_FPR9, task_struct, thread.fpu.fpr[9]);
OFFSET(THREAD_FPR10, task_struct, thread.fpu.fpr[10]);
OFFSET(THREAD_FPR11, task_struct, thread.fpu.fpr[11]);
OFFSET(THREAD_FPR12, task_struct, thread.fpu.fpr[12]);
OFFSET(THREAD_FPR13, task_struct, thread.fpu.fpr[13]);
OFFSET(THREAD_FPR14, task_struct, thread.fpu.fpr[14]);
OFFSET(THREAD_FPR15, task_struct, thread.fpu.fpr[15]);
OFFSET(THREAD_FPR16, task_struct, thread.fpu.fpr[16]);
OFFSET(THREAD_FPR17, task_struct, thread.fpu.fpr[17]);
OFFSET(THREAD_FPR18, task_struct, thread.fpu.fpr[18]);
OFFSET(THREAD_FPR19, task_struct, thread.fpu.fpr[19]);
OFFSET(THREAD_FPR20, task_struct, thread.fpu.fpr[20]);
OFFSET(THREAD_FPR21, task_struct, thread.fpu.fpr[21]);
OFFSET(THREAD_FPR22, task_struct, thread.fpu.fpr[22]);
OFFSET(THREAD_FPR23, task_struct, thread.fpu.fpr[23]);
OFFSET(THREAD_FPR24, task_struct, thread.fpu.fpr[24]);
OFFSET(THREAD_FPR25, task_struct, thread.fpu.fpr[25]);
OFFSET(THREAD_FPR26, task_struct, thread.fpu.fpr[26]);
OFFSET(THREAD_FPR27, task_struct, thread.fpu.fpr[27]);
OFFSET(THREAD_FPR28, task_struct, thread.fpu.fpr[28]);
OFFSET(THREAD_FPR29, task_struct, thread.fpu.fpr[29]);
OFFSET(THREAD_FPR30, task_struct, thread.fpu.fpr[30]);
OFFSET(THREAD_FPR31, task_struct, thread.fpu.fpr[31]);
OFFSET(THREAD_FCR31, task_struct, thread.fpu.fcr31);
OFFSET(THREAD_MSA_CSR, task_struct, thread.fpu.msacsr);
BLANK();
}
void output_mm_defines(void)
{
COMMENT("Size of struct page");
DEFINE(STRUCT_PAGE_SIZE, sizeof(struct page));
BLANK();
COMMENT("Linux mm_struct offsets.");
OFFSET(MM_USERS, mm_struct, mm_users);
OFFSET(MM_PGD, mm_struct, pgd);
OFFSET(MM_CONTEXT, mm_struct, context);
BLANK();
DEFINE(_PGD_T_SIZE, sizeof(pgd_t));
DEFINE(_PMD_T_SIZE, sizeof(pmd_t));
DEFINE(_PTE_T_SIZE, sizeof(pte_t));
BLANK();
DEFINE(_PGD_T_LOG2, PGD_T_LOG2);
#ifndef __PAGETABLE_PMD_FOLDED
DEFINE(_PMD_T_LOG2, PMD_T_LOG2);
#endif
DEFINE(_PTE_T_LOG2, PTE_T_LOG2);
BLANK();
DEFINE(_PGD_ORDER, PGD_ORDER);
#ifndef __PAGETABLE_PMD_FOLDED
DEFINE(_PMD_ORDER, PMD_ORDER);
#endif
DEFINE(_PTE_ORDER, PTE_ORDER);
BLANK();
DEFINE(_PMD_SHIFT, PMD_SHIFT);
DEFINE(_PGDIR_SHIFT, PGDIR_SHIFT);
BLANK();
DEFINE(_PTRS_PER_PGD, PTRS_PER_PGD);
DEFINE(_PTRS_PER_PMD, PTRS_PER_PMD);
DEFINE(_PTRS_PER_PTE, PTRS_PER_PTE);
BLANK();
DEFINE(_PAGE_SHIFT, PAGE_SHIFT);
DEFINE(_PAGE_SIZE, PAGE_SIZE);
BLANK();
}
#ifdef CONFIG_32BIT
void output_sc_defines(void)
{
COMMENT("Linux sigcontext offsets.");
OFFSET(SC_REGS, sigcontext, sc_regs);
OFFSET(SC_FPREGS, sigcontext, sc_fpregs);
OFFSET(SC_ACX, sigcontext, sc_acx);
OFFSET(SC_MDHI, sigcontext, sc_mdhi);
OFFSET(SC_MDLO, sigcontext, sc_mdlo);
OFFSET(SC_PC, sigcontext, sc_pc);
OFFSET(SC_FPC_CSR, sigcontext, sc_fpc_csr);
OFFSET(SC_FPC_EIR, sigcontext, sc_fpc_eir);
OFFSET(SC_HI1, sigcontext, sc_hi1);
OFFSET(SC_LO1, sigcontext, sc_lo1);
OFFSET(SC_HI2, sigcontext, sc_hi2);
OFFSET(SC_LO2, sigcontext, sc_lo2);
OFFSET(SC_HI3, sigcontext, sc_hi3);
OFFSET(SC_LO3, sigcontext, sc_lo3);
BLANK();
}
#endif
#ifdef CONFIG_64BIT
void output_sc_defines(void)
{
COMMENT("Linux sigcontext offsets.");
OFFSET(SC_REGS, sigcontext, sc_regs);
OFFSET(SC_FPREGS, sigcontext, sc_fpregs);
OFFSET(SC_MDHI, sigcontext, sc_mdhi);
OFFSET(SC_MDLO, sigcontext, sc_mdlo);
OFFSET(SC_PC, sigcontext, sc_pc);
OFFSET(SC_FPC_CSR, sigcontext, sc_fpc_csr);
BLANK();
}
#endif
void output_signal_defined(void)
{
COMMENT("Linux signal numbers.");
DEFINE(_SIGHUP, SIGHUP);
DEFINE(_SIGINT, SIGINT);
DEFINE(_SIGQUIT, SIGQUIT);
DEFINE(_SIGILL, SIGILL);
DEFINE(_SIGTRAP, SIGTRAP);
DEFINE(_SIGIOT, SIGIOT);
DEFINE(_SIGABRT, SIGABRT);
DEFINE(_SIGEMT, SIGEMT);
DEFINE(_SIGFPE, SIGFPE);
DEFINE(_SIGKILL, SIGKILL);
DEFINE(_SIGBUS, SIGBUS);
DEFINE(_SIGSEGV, SIGSEGV);
DEFINE(_SIGSYS, SIGSYS);
DEFINE(_SIGPIPE, SIGPIPE);
DEFINE(_SIGALRM, SIGALRM);
DEFINE(_SIGTERM, SIGTERM);
DEFINE(_SIGUSR1, SIGUSR1);
DEFINE(_SIGUSR2, SIGUSR2);
DEFINE(_SIGCHLD, SIGCHLD);
DEFINE(_SIGPWR, SIGPWR);
DEFINE(_SIGWINCH, SIGWINCH);
DEFINE(_SIGURG, SIGURG);
DEFINE(_SIGIO, SIGIO);
DEFINE(_SIGSTOP, SIGSTOP);
DEFINE(_SIGTSTP, SIGTSTP);
DEFINE(_SIGCONT, SIGCONT);
DEFINE(_SIGTTIN, SIGTTIN);
DEFINE(_SIGTTOU, SIGTTOU);
DEFINE(_SIGVTALRM, SIGVTALRM);
DEFINE(_SIGPROF, SIGPROF);
DEFINE(_SIGXCPU, SIGXCPU);
DEFINE(_SIGXFSZ, SIGXFSZ);
BLANK();
}
#ifdef CONFIG_CPU_CAVIUM_OCTEON
void output_octeon_cop2_state_defines(void)
{
COMMENT("Octeon specific octeon_cop2_state offsets.");
OFFSET(OCTEON_CP2_CRC_IV, octeon_cop2_state, cop2_crc_iv);
OFFSET(OCTEON_CP2_CRC_LENGTH, octeon_cop2_state, cop2_crc_length);
OFFSET(OCTEON_CP2_CRC_POLY, octeon_cop2_state, cop2_crc_poly);
OFFSET(OCTEON_CP2_LLM_DAT, octeon_cop2_state, cop2_llm_dat);
OFFSET(OCTEON_CP2_3DES_IV, octeon_cop2_state, cop2_3des_iv);
OFFSET(OCTEON_CP2_3DES_KEY, octeon_cop2_state, cop2_3des_key);
OFFSET(OCTEON_CP2_3DES_RESULT, octeon_cop2_state, cop2_3des_result);
OFFSET(OCTEON_CP2_AES_INP0, octeon_cop2_state, cop2_aes_inp0);
OFFSET(OCTEON_CP2_AES_IV, octeon_cop2_state, cop2_aes_iv);
OFFSET(OCTEON_CP2_AES_KEY, octeon_cop2_state, cop2_aes_key);
OFFSET(OCTEON_CP2_AES_KEYLEN, octeon_cop2_state, cop2_aes_keylen);
OFFSET(OCTEON_CP2_AES_RESULT, octeon_cop2_state, cop2_aes_result);
OFFSET(OCTEON_CP2_GFM_MULT, octeon_cop2_state, cop2_gfm_mult);
OFFSET(OCTEON_CP2_GFM_POLY, octeon_cop2_state, cop2_gfm_poly);
OFFSET(OCTEON_CP2_GFM_RESULT, octeon_cop2_state, cop2_gfm_result);
OFFSET(OCTEON_CP2_HSH_DATW, octeon_cop2_state, cop2_hsh_datw);
OFFSET(OCTEON_CP2_HSH_IVW, octeon_cop2_state, cop2_hsh_ivw);
OFFSET(OCTEON_CP2_SHA3, octeon_cop2_state, cop2_sha3);
OFFSET(THREAD_CP2, task_struct, thread.cp2);
OFFSET(THREAD_CVMSEG, task_struct, thread.cvmseg.cvmseg);
BLANK();
}
#endif
#ifdef CONFIG_HIBERNATION
void output_pbe_defines(void)
{
COMMENT(" Linux struct pbe offsets. ");
OFFSET(PBE_ADDRESS, pbe, address);
OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address);
OFFSET(PBE_NEXT, pbe, next);
DEFINE(PBE_SIZE, sizeof(struct pbe));
BLANK();
}
#endif
#ifdef CONFIG_CPU_PM
void output_pm_defines(void)
{
COMMENT(" PM offsets. ");
#ifdef CONFIG_EVA
OFFSET(SSS_SEGCTL0, mips_static_suspend_state, segctl[0]);
OFFSET(SSS_SEGCTL1, mips_static_suspend_state, segctl[1]);
OFFSET(SSS_SEGCTL2, mips_static_suspend_state, segctl[2]);
#endif
OFFSET(SSS_SP, mips_static_suspend_state, sp);
BLANK();
}
#endif
void output_kvm_defines(void)
{
COMMENT(" KVM/MIPS Specific offsets. ");
OFFSET(VCPU_FPR0, kvm_vcpu_arch, fpu.fpr[0]);
OFFSET(VCPU_FPR1, kvm_vcpu_arch, fpu.fpr[1]);
OFFSET(VCPU_FPR2, kvm_vcpu_arch, fpu.fpr[2]);
OFFSET(VCPU_FPR3, kvm_vcpu_arch, fpu.fpr[3]);
OFFSET(VCPU_FPR4, kvm_vcpu_arch, fpu.fpr[4]);
OFFSET(VCPU_FPR5, kvm_vcpu_arch, fpu.fpr[5]);
OFFSET(VCPU_FPR6, kvm_vcpu_arch, fpu.fpr[6]);
OFFSET(VCPU_FPR7, kvm_vcpu_arch, fpu.fpr[7]);
OFFSET(VCPU_FPR8, kvm_vcpu_arch, fpu.fpr[8]);
OFFSET(VCPU_FPR9, kvm_vcpu_arch, fpu.fpr[9]);
OFFSET(VCPU_FPR10, kvm_vcpu_arch, fpu.fpr[10]);
OFFSET(VCPU_FPR11, kvm_vcpu_arch, fpu.fpr[11]);
OFFSET(VCPU_FPR12, kvm_vcpu_arch, fpu.fpr[12]);
OFFSET(VCPU_FPR13, kvm_vcpu_arch, fpu.fpr[13]);
OFFSET(VCPU_FPR14, kvm_vcpu_arch, fpu.fpr[14]);
OFFSET(VCPU_FPR15, kvm_vcpu_arch, fpu.fpr[15]);
OFFSET(VCPU_FPR16, kvm_vcpu_arch, fpu.fpr[16]);
OFFSET(VCPU_FPR17, kvm_vcpu_arch, fpu.fpr[17]);
OFFSET(VCPU_FPR18, kvm_vcpu_arch, fpu.fpr[18]);
OFFSET(VCPU_FPR19, kvm_vcpu_arch, fpu.fpr[19]);
OFFSET(VCPU_FPR20, kvm_vcpu_arch, fpu.fpr[20]);
OFFSET(VCPU_FPR21, kvm_vcpu_arch, fpu.fpr[21]);
OFFSET(VCPU_FPR22, kvm_vcpu_arch, fpu.fpr[22]);
OFFSET(VCPU_FPR23, kvm_vcpu_arch, fpu.fpr[23]);
OFFSET(VCPU_FPR24, kvm_vcpu_arch, fpu.fpr[24]);
OFFSET(VCPU_FPR25, kvm_vcpu_arch, fpu.fpr[25]);
OFFSET(VCPU_FPR26, kvm_vcpu_arch, fpu.fpr[26]);
OFFSET(VCPU_FPR27, kvm_vcpu_arch, fpu.fpr[27]);
OFFSET(VCPU_FPR28, kvm_vcpu_arch, fpu.fpr[28]);
OFFSET(VCPU_FPR29, kvm_vcpu_arch, fpu.fpr[29]);
OFFSET(VCPU_FPR30, kvm_vcpu_arch, fpu.fpr[30]);
OFFSET(VCPU_FPR31, kvm_vcpu_arch, fpu.fpr[31]);
OFFSET(VCPU_FCR31, kvm_vcpu_arch, fpu.fcr31);
OFFSET(VCPU_MSA_CSR, kvm_vcpu_arch, fpu.msacsr);
BLANK();
}
#ifdef CONFIG_MIPS_CPS
void output_cps_defines(void)
{
COMMENT(" MIPS CPS offsets. ");
OFFSET(COREBOOTCFG_VPEMASK, core_boot_config, vpe_mask);
OFFSET(COREBOOTCFG_VPECONFIG, core_boot_config, vpe_config);
DEFINE(COREBOOTCFG_SIZE, sizeof(struct core_boot_config));
OFFSET(VPEBOOTCFG_PC, vpe_boot_config, pc);
OFFSET(VPEBOOTCFG_SP, vpe_boot_config, sp);
OFFSET(VPEBOOTCFG_GP, vpe_boot_config, gp);
DEFINE(VPEBOOTCFG_SIZE, sizeof(struct vpe_boot_config));
}
#endif
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