75e29b18d9
The KSTK_* macros used an inordinate amount of stack. In order to overcome an impedance mismatch between their interface, which just returns a single register value, and the interface of get_thread_regs, which took a full pt_regs, the implementation created an on-stack pt_regs, filled it in, and returned one field. do_task_stat calls KSTK_* twice, resulting in two local pt_regs, blowing out the stack. This patch changes the interface (and name) of get_thread_regs to just return a single register from a jmp_buf. The include of archsetjmp.h" in registers.h to get the definition of jmp_buf exposed a bogus include of <setjmp.h> in start_up.c. <setjmp.h> shouldn't be used anywhere any more since UML uses the klibc setjmp/longjmp. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/*
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* Copyright (C) 2004 PathScale, Inc
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* Licensed under the GPL
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*/
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#include <errno.h>
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#include <string.h>
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#include "ptrace_user.h"
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#include "uml-config.h"
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#include "skas_ptregs.h"
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#include "registers.h"
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#include "longjmp.h"
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#include "user.h"
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/* These are set once at boot time and not changed thereafter */
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static unsigned long exec_regs[HOST_FRAME_SIZE];
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static unsigned long exec_fp_regs[HOST_FP_SIZE];
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void init_thread_registers(union uml_pt_regs *to)
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{
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memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
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memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp));
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}
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static int move_registers(int pid, int int_op, int fp_op,
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union uml_pt_regs *regs)
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{
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if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
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return(-errno);
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if(ptrace(fp_op, pid, 0, regs->skas.fp) < 0)
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return(-errno);
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return(0);
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}
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void save_registers(int pid, union uml_pt_regs *regs)
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{
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int err;
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err = move_registers(pid, PTRACE_GETREGS, PTRACE_GETFPREGS, regs);
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if(err)
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panic("save_registers - saving registers failed, errno = %d\n",
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-err);
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}
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void restore_registers(int pid, union uml_pt_regs *regs)
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{
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int err;
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err = move_registers(pid, PTRACE_SETREGS, PTRACE_SETFPREGS, regs);
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if(err)
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panic("restore_registers - saving registers failed, "
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"errno = %d\n", -err);
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}
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void init_registers(int pid)
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{
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int err;
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err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
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if(err)
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panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
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errno);
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err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
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if(err)
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panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
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errno);
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}
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void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
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{
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memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
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if(fp_regs != NULL)
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memcpy(fp_regs, exec_fp_regs,
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HOST_FP_SIZE * sizeof(unsigned long));
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}
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unsigned long get_thread_reg(int reg, jmp_buf *buf)
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{
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switch(reg){
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case RIP: return buf[0]->__rip;
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case RSP: return buf[0]->__rsp;
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case RBP: return buf[0]->__rbp;
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default:
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printk("get_thread_regs - unknown register %d\n", reg);
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return 0;
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}
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}
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