diff options
Diffstat (limited to 'gdb/sparc-linux-tdep.c')
| -rw-r--r-- | gdb/sparc-linux-tdep.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gdb/sparc-linux-tdep.c b/gdb/sparc-linux-tdep.c index 83d7589d1fe..c619ab1106b 100644 --- a/gdb/sparc-linux-tdep.c +++ b/gdb/sparc-linux-tdep.c @@ -211,6 +211,32 @@ sparc32_linux_collect_core_fpregset (const struct regset *regset, sparc32_collect_fpregset (regcache, regnum, fpregs); } +/* Set the program counter for process PTID to PC. */ + +#define PSR_SYSCALL 0x00004000 + +static void +sparc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); + ULONGEST psr; + + regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); + regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); + + /* Clear the "in syscall" bit to prevent the kernel from + messing with the PCs we just installed, if we happen to be + within an interrupted system call that the kernel wants to + restart. + + Note that after we return from the dummy call, the PSR et al. + registers will be automatically restored, and the kernel + continues to restart the system call at this point. */ + regcache_cooked_read_unsigned (regcache, SPARC32_PSR_REGNUM, &psr); + psr &= ~PSR_SYSCALL; + regcache_cooked_write_unsigned (regcache, SPARC32_PSR_REGNUM, psr); +} + static void @@ -251,6 +277,8 @@ sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) /* Hook in the DWARF CFI frame unwinder. */ dwarf2_append_unwinders (gdbarch); + + set_gdbarch_write_pc (gdbarch, sparc_linux_write_pc); } /* Provide a prototype to silence -Wmissing-prototypes. */ |