diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/i386obsd-tdep.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb/i386obsd-tdep.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c b/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c index 4dd78294785..5b23e93c0e7 100644 --- a/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c +++ b/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c @@ -38,6 +38,7 @@ #include "i386-tdep.h" #include "i387-tdep.h" #include "solib-svr4.h" +#include "bsd-uthread.h" /* Support for signal handlers. */ @@ -192,6 +193,120 @@ int i386obsd_sc_reg_offset[I386_NUM_GREGS] = 0 * 4 /* %gs */ }; +/* From /usr/src/lib/libpthread/arch/i386/uthread_machdep.c. */ +static int i386obsd_uthread_reg_offset[] = +{ + 11 * 4, /* %eax */ + 10 * 4, /* %ecx */ + 9 * 4, /* %edx */ + 8 * 4, /* %ebx */ + -1, /* %esp */ + 6 * 4, /* %ebp */ + 5 * 4, /* %esi */ + 4 * 4, /* %edi */ + 12 * 4, /* %eip */ + -1, /* %eflags */ + 13 * 4, /* %cs */ + -1, /* %ss */ + 3 * 4, /* %ds */ + 2 * 4, /* %es */ + 1 * 4, /* %fs */ + 0 * 4 /* %gs */ +}; + +/* Offset within the thread structure where we can find the saved + stack pointer (%esp). */ +#define I386OBSD_UTHREAD_ESP_OFFSET 176 + +static void +i386obsd_supply_uthread (struct regcache *regcache, + int regnum, CORE_ADDR addr) +{ + CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; + CORE_ADDR sp = 0; + char buf[4]; + int i; + + gdb_assert (regnum >= -1); + + if (regnum == -1 || regnum == I386_ESP_REGNUM) + { + int offset; + + /* Fetch stack pointer from thread structure. */ + sp = read_memory_unsigned_integer (sp_addr, 4); + + /* Adjust the stack pointer such that it looks as if we just + returned from _thread_machdep_switch. */ + offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; + store_unsigned_integer (buf, 4, sp + offset); + regcache_raw_supply (regcache, I386_ESP_REGNUM, buf); + } + + for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) + { + if (i386obsd_uthread_reg_offset[i] != -1 + && (regnum == -1 || regnum == i)) + { + /* Fetch stack pointer from thread structure (if we didn't + do so already). */ + if (sp == 0) + sp = read_memory_unsigned_integer (sp_addr, 4); + + /* Read the saved register from the stack frame. */ + read_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); + regcache_raw_supply (regcache, i, buf); + } + } + +} + +static void +i386obsd_collect_uthread (const struct regcache *regcache, + int regnum, CORE_ADDR addr) +{ + CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; + CORE_ADDR sp = 0; + char buf[4]; + int i; + + gdb_assert (regnum >= -1); + + if (regnum == -1 || regnum == I386_ESP_REGNUM) + { + int offset; + + /* Calculate the stack pointer (frame pointer) that will be + stored into the thread structure. */ + offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; + regcache_raw_collect (regcache, I386_ESP_REGNUM, buf); + sp = extract_unsigned_integer (buf, 4) - offset; + + /* Store the stack pointer. */ + write_memory_unsigned_integer (sp_addr, 4, sp); + + /* The stack pointer was (potentially) modified. Make sure we + build a proper stack frame. */ + regnum = -1; + } + + for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) + { + if (i386obsd_uthread_reg_offset[i] != -1 + && (regnum == -1 || regnum == i)) + { + /* Fetch stack pointer from thread structure (if we didn't + calculate it already). */ + if (sp == 0) + sp = read_memory_unsigned_integer (sp_addr, 4); + + /* Write the register into the stack frame. */ + regcache_raw_collect (regcache, i, buf); + write_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); + } + } +} + static void i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { @@ -217,6 +332,10 @@ i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) original 4.3 BSD. */ tdep->sc_reg_offset = i386obsd_sc_reg_offset; tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset); + + /* OpenBSD provides a user-level threads implementation. */ + bsd_uthread_set_supply_uthread (gdbarch, i386obsd_supply_uthread); + bsd_uthread_set_collect_uthread (gdbarch, i386obsd_collect_uthread); } /* OpenBSD a.out. */ |